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DESCRIPTION JP2011203654

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DESCRIPTION JP2011203654
The present invention provides a voice reproduction apparatus capable of making it possible for
a user on board a vehicle to know the getting-off timing when the noise canceling function is
turned on. SOLUTION: A voice reproduction device 100 cancels the noise by acoustically
combining it with a noise from a microphone 102 for picking up noise and a voice signal of the
noise obtained by the microphone 102 picking up the noise. And a headphone driver 114 for
acoustically reproducing noise cancellation audio signals so as to acoustically combine them with
noise, and an input from the user. A setting unit 122 for setting conditions for determining
whether or not the user has arrived at the destination based on the information on the
destination, and the headphone driver 114 for the noise cancellation audio signal when the set
conditions are satisfied. And a control unit 120 configured to shut off the supply of [Selected
figure] Figure 1
Audio reproduction apparatus, audio reproduction method and program
[0001]
The present invention relates to an audio reproduction apparatus, an audio reproduction method,
and a program.
[0002]
In recent years, among the audio reproducing devices sold on the market, the audio reproducing
device equipped with the noise canceling function is gradually increasing its share.
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1
The noise canceling function is incorporated in a headphone device as an audio reproduction
device, or in a portable music player or a mobile phone as an audio reproduction device. One of
the reasons why the share of such an audio reproduction device is growing is that the
performance itself of the noise canceling function is getting better.
[0003]
Various techniques have been proposed for an audio reproduction apparatus equipped with such
a noise canceling function. For example, a noise reduction voice reproducing apparatus and
method capable of easily hearing and reproducing a voice to be listened to under the noise
environment have been proposed (for example, see Patent Document 1).
[0004]
JP, 2010-11117, A
[0005]
However, along with the performance improvement of the noise canceling function, for example,
a train or a bus (hereinafter referred to as a "vehicle").
If the user on board is turning on the noise canceling function of the audio playback device, the
surrounding noise is reduced, so people miss the announcement in the car or fall into a
comfortable sleep. Stations and bus stops (hereinafter referred to as “destinations”. There are
times when you pass by). In addition, the user may endure sleepiness even though he is sleepy
despite fear of passing by the destination to get off.
[0006]
Therefore, the present invention has been made in view of the above problems, and an object of
the present invention is to dismount a user who is on a vehicle when the noise canceling function
is turned on. It is an object of the present invention to provide a new and improved audio
reproduction apparatus, an audio reproduction method, and a program capable of grasping
timing.
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2
[0007]
In order to solve the above problems, according to one aspect of the present invention, a noise
pickup unit for picking up noise and the noise and sound from the sound signal of noise obtained
by the sound pickup unit are obtained. A generation unit for generating a noise cancellation voice
signal for canceling the noise by synthetically combining the noise cancellation voice signal and
the noise cancellation voice signal to be acoustically synthesized with the noise The noise
cancellation when the reproducing unit, a setting unit for setting a condition for determining
whether or not the user has arrived at the destination based on the information on the
destination input by the user, and the condition are satisfied There is provided an audio
reproduction apparatus comprising: a control unit configured to shut off supply of an audio
signal to the reproduction unit.
[0008]
The information on the destination may be a boarding time, and the condition may be whether or
not the boarding time has elapsed.
[0009]
The information on the destination may be position information of the destination, and the
condition may be whether or not the current position information matches the position
information of the destination.
[0010]
The information on the destination is an announcement voice for notifying the arrival at the
destination, and the conditions include an announcement voice of the voice signal of the noise
and an announcement voice for notifying the arrival at the destination. May or may not match.
[0011]
The control unit may gradually shut off the supply of the noise cancellation audio signal to the
reproduction unit when the condition is satisfied.
[0012]
A noise cancellation audio signal generated by the generation unit for canceling the noise by
acoustically synthesizing the noise from an audio signal of noise acquired by the sound collection
unit; Includes a second generation unit that generates another noise cancellation audio signal
different from the other, and the control unit is configured to supply the other noise cancellation
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3
audio signal to the reproduction unit when the condition is satisfied. , And the reproduction unit
may reproduce the sound of the other noise cancellation audio signal supplied.
[0013]
The control unit further includes a third generation unit that generates a monitoring audio signal
in which an audio component to be listened to is enhanced from a noise audio signal obtained by
collecting noise with the sound collection unit. The control unit may control the monitor audio
signal to be supplied to the reproduction unit when the condition is satisfied, and the
reproduction unit may acoustically reproduce the supplied monitor audio signal.
[0014]
The control unit controls the notification sound signal stored in the storage unit to be supplied to
the reproduction unit when the condition is satisfied, and the reproduction unit reproduces the
sound of the notification sound signal supplied. You may
[0015]
Another sound pickup unit may be provided, and directivity may be formed using the sound
pickup unit and the other sound pickup unit.
[0016]
Furthermore, another sound collecting unit may be provided, and the sound collecting unit may
be provided at a position not intersecting the axis passing through the sound collecting unit and
the other sound collecting unit.
[0017]
Further, in order to solve the above problems, according to another aspect of the present
invention, the noise collecting unit acoustically combines the noise with the noise from the
speech signal of the noise obtained by the sound collecting unit for collecting the noise.
Generating a noise canceling voice signal for canceling the noise, and playing back the noise
canceling voice signal so as to acoustically combine with the noise. The setting step of setting a
condition for determining whether or not the user has arrived at the destination based on the
information on the destination input by the user, and the noise canceling voice signal when the
condition is satisfied And a control step to prevent sound reproduction.
[0018]
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Further, in order to solve the above problems, according to another aspect of the present
invention, a sound pickup unit for picking up noise from a computer, and an audio signal of noise
obtained by the sound pickup unit collecting sound. And a generation unit for generating a noise
canceling voice signal for canceling the noise by acoustically combining with the noise, and the
noise and acoustically reproducing the noise canceling voice signal. And a setting unit for setting
a condition for determining whether or not the user has arrived at the destination based on the
information on the destination input by the user, and the condition is satisfied. There is provided
a program for functioning as a control unit for interrupting the supply of the noise canceling
audio signal to the reproduction unit.
[0019]
As described above, according to the present invention, when the noise canceling function is
turned on, it is possible to allow the user on board the vehicle to grasp the getting-off timing.
[0020]
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows roughly the
structure of the audio | voice reproduction apparatus which concerns on the 1st Embodiment of
this invention.
It is a flowchart of the audio reproduction process which the audio reproduction apparatus of
FIG. 1 performs.
It is explanatory drawing for demonstrating the audio reproduction process of FIG.
It is explanatory drawing which shows roughly the structure of the audio | voice reproduction
apparatus which concerns on the 2nd Embodiment of this invention.
It is a flowchart of the audio reproduction process which the audio reproduction apparatus of
FIG. 4 performs.
It is explanatory drawing for demonstrating the audio | voice reproduction | regeneration
processing of FIG.
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It is explanatory drawing for demonstrating the audio | voice reproduction | regeneration
processing of FIG.
It is explanatory drawing which shows roughly the structure of the audio | voice reproduction
apparatus which concerns on the 3rd Embodiment of this invention.
It is a flowchart of the 1st audio reproduction process which the audio reproduction apparatus of
FIG. 8 performs.
It is a flowchart of the 2nd audio reproduction process which the audio reproduction apparatus
of FIG. 8 performs.
It is explanatory drawing for demonstrating the audio | voice reproduction | regeneration
processing of FIG.
It is an explanatory view for explaining an audio signal containing noise which a microphone
picks up.
It is an explanatory view for explaining arrangement of a microphone provided in a headphone
device.
It is explanatory drawing which shows roughly the structure of the audio | voice reproduction
apparatus which concerns on the 4th Embodiment of this invention.
It is a flowchart of the audio reproduction process which the audio reproduction apparatus of
FIG. 14 performs. It is explanatory drawing which shows roughly the structure of the audio |
voice reproduction apparatus which concerns on the 5th Embodiment of this invention. It is
explanatory drawing which shows roughly the structure of the audio | voice reproduction
apparatus which concerns on the 6th Embodiment of this invention. It is explanatory drawing
which shows roughly the structure of the audio | voice reproduction apparatus based on the 7th
Embodiment of this invention. It is explanatory drawing which shows roughly the structure of the
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audio | voice reproduction apparatus based on the 8th Embodiment of this invention. It is
explanatory drawing which shows roughly the structure of the audio | voice reproduction
apparatus which concerns on the 9th Embodiment of this invention.
[0021]
The present invention will now be described more fully with reference to the accompanying
drawings, in which exemplary embodiments of the invention are shown. In the present
specification and the drawings, components having substantially the same functional
configuration will be assigned the same reference numerals and redundant description will be
omitted.
[0022]
The description will be made in the following order. 1. Audio Reproducing Device (First
Embodiment) Voice Reproduction Process (First Embodiment) Voice Reproducing Device (Second
Embodiment) Voice Reproduction Process (Second Embodiment) Voice Reproducing Device
(Third Embodiment) First voice reproduction processing (third embodiment) Second Voice
Reproduction Process (Third Embodiment) 8. Audio Reproducing Device (Fourth Embodiment)
Voice Reproduction Processing (Fourth Embodiment) Audio Reproducing Device (Fifth
Embodiment) Audio Reproducing Device (Sixth Embodiment) Audio Reproducing Device (Seventh
Embodiment) 13. Audio Reproducing Device (Eighth Embodiment) Voice Reproducing Device
(Ninth Embodiment)
[0023]
[1. Audio Reproducing Apparatus (First Embodiment)] First, an audio reproducing apparatus
according to a first embodiment of the present invention will be described. FIG. 1 is an
explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
[0024]
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In FIG. 1, the audio reproduction device 100 is a headphone device equipped with a noise
canceling function, a portable music player, a mobile phone or the like. The audio reproduction
apparatus 100 includes a microphone 102, a microphone amplifier 104, a noise canceling (NC)
filter circuit 106, a switch circuit 108, an adding circuit 110, a headphone amplifier 112, and a
headphone driver 114. Prepare.
[0025]
The microphone 102 is an example of the sound collection unit of the present invention, and is
provided outside the headphone case (not shown). The microphone 102 supplies an audio signal,
which is an electrical signal including the collected noise, to the microphone amplifier 104. The
microphone amplifier 104 amplifies the audio signal supplied from the microphone 102. Then,
the microphone amplifier 104 supplies the amplified audio signal to the filter circuit 106 for NC.
[0026]
The NC filter circuit 106 is an example of the generation unit of the present invention, and
performs appropriate filtering processing on the audio signal supplied from the microphone
amplifier 104 to generate a noise canceling audio signal. The switch circuit 108 is controlled to
be on / off by a control unit 120 described later. When the switch circuit 108 is turned on by the
control unit 120, the noise canceling function is turned on in the audio reproduction device 100.
Further, when the switch circuit 108 is turned off by the control unit 120, the supply of the noise
canceling audio signal to the adding circuit 110 is cut off in the audio reproduction apparatus
100, and the noise canceling function is turned off.
[0027]
The adder circuit 110 adds the noise canceling audio signal supplied from the NC filter circuit
106 when the switch circuit 108 is turned on and the music signal supplied from the variable
amplifier circuit 118 described later. Generate an addition signal. Then, the addition circuit 110
supplies the generated addition signal to the headphone amplifier 112.
[0028]
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8
The headphone amplifier 112 amplifies the addition signal supplied from the addition circuit
110. Then, the headphone amplifier 112 supplies the amplified addition signal to the headphone
driver 114. The headphone driver 114 is provided inside a headphone case (not shown). The
headphone driver 114 is an example of the reproduction unit according to the present invention,
and acoustically reproduces the addition signal which is an electrical signal supplied from the
headphone amplifier 112.
[0029]
Also, the audio reproduction device 100 includes an audio signal input end 116 and a variable
amplification circuit 118. The audio signal input end 116 is composed of, for example, a
headphone plug which is inserted into a headphone jack of a portable music player. The variable
amplification circuit 118 amplifies, for example, a music signal supplied via the audio signal
input terminal 116. The amplification factor of the variable amplification circuit 118 can be
changed. Then, the variable amplification circuit 118 supplies the amplified music signal to the
addition circuit 110.
[0030]
Further, the audio reproduction device 100 includes a control unit 120, an operation unit 128,
and a clock unit 130. The control unit 120 controls on / off of the switch circuit 108, for
example. The control unit 120 includes a setting unit 122, a counting unit 124, and a notification
control unit 126.
[0031]
The setting unit 122 sets, for example, the time required for the user to arrive near the
destination input via the operation unit 128 as the boarding time for the vehicle before boarding
the vehicle. The counting unit 124 counts time by acquiring time information from the clock unit
130. The notification control unit 126 notifies the user of arrival near the destination, for
example, immediately before arrival at the destination. For example, the notification control unit
126 notifies the user of arrival in the vicinity of the destination by turning off the switch circuit
108 and turning off the noise canceling function of the audio reproduction device 100 from on.
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[0032]
The operation unit 128 receives an operation input by the user. The clock unit 130 includes, for
example, a clock.
[0033]
Also, the audio reproduction device 100 includes a sensor unit 132. The sensor unit 132 is
configured of, for example, an accelerometer. The sensor unit 132 can transmit acceleration
information to the control unit 120.
[0034]
Further, the audio reproduction device 100 includes a communication unit 134. The
communication unit 134 is connectable to the server 138 connected to the communication
network 134. For example, the server 138 is a server that provides a route search service.
[0035]
By the way, along with the performance improvement of the noise canceling function in the
audio reproduction device 100, for example, a train, a bus, etc. If the user on board is turning on
the noise canceling function of the audio playback device 100, the surrounding noise is reduced,
so that the user can not hear in-car announcements or falls into a comfortable sleep and gets out
of the vehicle. Stations and bus stops (hereinafter referred to as "destinations"). There are times
when you pass by).
[0036]
Therefore, the sound reproducing apparatus 100 according to the present embodiment executes
the sound reproducing process of FIG. 2 described later to make it possible for the user on the
vehicle when the noise canceling function is turned on. , You can get the timing of getting off.
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[0037]
[2.
Audio Reproduction Process (First Embodiment) Next, an audio reproduction process performed
by the audio reproduction device 100 of FIG. 1 will be described. FIG. 2 is a flowchart of an audio
reproduction process performed by the audio reproduction device 100 of FIG.
[0038]
In FIG. 2, first, when an operation for turning on the noise canceling function of the audio
reproduction device 100 is performed by the user of the audio reproduction device 100 via the
operation unit 128, the control unit 120 turns on the switch circuit 108. Then, the noise
canceling function of the audio reproduction device 100 is turned on (step S102).
[0039]
Next, as shown in FIG. 3, when, for example, the time taken for the user to arrive near the
destination is input by the user via the operation unit 128 before entering the vehicle, the setting
unit 122 receives the input time Is set as the boarding time (step S104).
The time required to arrive near the destination is an example of information regarding the
destination of the present invention.
[0040]
Next, the counting unit 124 acquires time information from the clock unit 130 and starts
counting (step S106).
[0041]
Next, the notification control unit 126 determines whether the boarding time set in step S104
has elapsed based on the count result of the counting unit 124 (step S108).
[0042]
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11
If it is determined in step S108 that the boarding time set in step S104 has not elapsed (NO in
step S108), the process of step S108 is repeated until the boarding time set in step S104 has
elapsed.
[0043]
As a result of the determination in step S108, when the boarding time set in step S104 has
elapsed (YES in step S108), the notification control unit 126, for example, immediately before
arrival at the destination, as shown in FIG. The switch circuit 108 is turned off, the noise
canceling function of the audio reproduction apparatus 100 is turned off (step S110), and the
process is terminated.
[0044]
According to the voice reproduction processing of FIG. 2, when the user turns on the noise
canceling function and the time taken for the user to arrive near the destination has passed, the
noise canceling function is turned off. Be done.
In the sound reproducing apparatus 100, when the noise canceling function is turned off, the
user's music listening environment changes, so that the user can know that the user has arrived
near the destination by the change in the music listening environment. .
In addition, when the noise canceling function is turned off, the ambient noise is not reduced, so
the user can know that he has arrived at the destination without missing the in-vehicle
announcement.
In addition, when the noise canceling function is turned off, ambient noise may disturb the user's
sleep, allowing the user to wake up and not pass the destination.
[0045]
As described above, according to the sound reproduction processing of FIG. 2, when the noise
canceling function is turned on, it is possible to make the user on the vehicle understand the
getting-off timing.
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12
[0046]
Further, in the voice reproduction process of FIG. 2, when the boarding time set in step S104 has
elapsed, the noise canceling function of the voice reproduction apparatus 100 is turned off to
notify the user of arrival near the destination. However, the notification control unit 126 may
obtain acceleration information from the sensor unit 132 and further notify the arrival in the
vicinity of the destination by further using the acceleration information.
For example, the notification control unit 126 may notify the user of arrival near the destination
when the vehicle decelerates in the vicinity of the boarding time set in step S104.
This utilizes the fact that when the vehicle stops at the destination, a deceleration operation is
required.
[0047]
Further, in the voice reproduction process of FIG. 2, although the time required for the user to
arrive in the vicinity of the destination is input in step S104, the user inputs only the destination,
and the setting unit 122 The time taken to arrive in the vicinity of the input destination may be
acquired from the server 138 connected to the communication network 136 via the
communication network 136, and the acquired time may be set as the boarding time. In addition,
when the server 138 provides a timetable-linked route search service, the control unit 120 can
acquire the time of arrival near the destination, and therefore, arrives at the current time and the
vicinity of the destination. The on / off of the switch circuit 108 may be controlled based on the
time of day.
[0048]
[3. Audio Reproducing Apparatus (Second Embodiment)] Next, an audio reproducing
apparatus according to a second embodiment of the present invention will be described. FIG. 4 is
an explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
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13
[0049]
In FIG. 4, the audio reproduction device 200 includes a microphone 202, a microphone amplifier
204, a noise canceling (NC) filter circuit 206, a switch circuit 208, an adding circuit 210, a
headphone amplifier 212, and a headphone driver 214. Equipped with These functions are
similar to those of the microphone 102, the microphone amplifier 104, the noise canceling (NC)
filter circuit 106, the switch circuit 108, the adder circuit 110, the headphone amplifier 112, and
the headphone driver 114 in the first embodiment described above. Because of the configuration,
these descriptions will be omitted.
[0050]
In addition, the audio reproduction device 200 includes an audio signal input end 216 and a
variable amplification circuit 218. These also have the same functional configuration as the audio
signal input terminal 116 and the variable amplifier circuit 118 in the first embodiment
described above, and thus the description thereof is also omitted.
[0051]
Further, the audio reproduction device 200 includes a control unit 220, an operation unit 226,
and a positioning unit 228. The control unit 220 controls, for example, on / off of the switch
circuit 208. The control unit 220 includes a setting unit 222 and a notification control unit 224.
[0052]
The setting unit 222 sets position information of the vicinity of the destination input by the user
via the operation unit 226 as position information of the vicinity of the destination. The
notification control unit 224 notifies the user of arrival near the destination, for example,
immediately before arrival at the destination. For example, the notification control unit 224
notifies the user of arrival in the vicinity of the destination by turning off the switch circuit 208
and turning off the noise canceling function of the audio reproduction device 200.
[0053]
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14
The operation unit 226 receives an operation input by the user. The positioning unit 228
performs positioning of the audio reproduction device 200 using, for example, GPS (Global
Positioning System). The positioning unit 228 can transmit position information of the current
position of the audio reproduction device 200 to the control unit 220.
[0054]
The voice reproduction device 200 according to the present embodiment performs the voice
reproduction process of FIG. 5 described later to dismount the user on the vehicle when the noise
canceling function is turned on. The timing can be understood.
[0055]
[4.
Audio Reproduction Process (Second Embodiment) Next, an audio reproduction process
performed by the audio reproduction device 200 of FIG. 4 will be described. FIG. 5 is a flowchart
of an audio reproduction process performed by the audio reproduction device 200 of FIG.
[0056]
In FIG. 5, first, when an operation for turning on the noise canceling function of the audio
reproduction device 200 is performed by the user of the audio reproduction device 200 via the
operation unit 226, the control unit 220 turns on the switch circuit 208. Then, the noise
canceling function of the audio reproduction device 200 is turned on (step S202).
[0057]
Next, as shown in FIG. 6, when the user inputs a destination via the operation unit 226, the
setting unit 222 sets position information of the vicinity of the input destination as position
information of the vicinity of the destination. (Step S204).
Next, the positioning unit 228 starts positioning of the audio reproduction device 200 (step
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15
S206). The position information in the vicinity of the destination is an example of the information
on the destination of the present invention.
[0058]
Next, the notification control unit 224 acquires current position information of the audio
reproduction device 200 from the positioning unit 228, and compares the acquired current
position information with the position information in the vicinity of the destination set in step
S204. Thus, it is determined whether or not it has arrived near the destination (step S208).
[0059]
As a result of the determination in step S208, when it has not arrived near the destination (NO in
step S208), the process of step S208 is repeated until it arrives in the vicinity of the destination.
[0060]
As a result of the determination in step S208, when arriving near the destination (YES in step
S208), as shown in FIG. 6, the notification control unit 224 determines, for example, the
destination for the user just before arrival at the destination. In order to notify the arrival in the
vicinity, the switch circuit 208 is turned off, the noise canceling function of the audio
reproduction device 200 is turned off (step S210), and this processing is ended.
[0061]
According to the audio reproduction process of FIG. 5, since the noise canceling function is
turned on by the user and the noise canceling function is turned off when arriving near the
destination input by the user, the above-described process is performed. The same effect as the
audio reproduction processing of FIG. 2 can be achieved.
Furthermore, in the audio reproduction process of FIG. 5, even when the vehicle is delayed due to
some trouble, it is possible to make the user on the vehicle understand the getting-off timing.
[0062]
Further, in the present embodiment, when the audio reproduction device 200 is configured as a
single headphone device, as shown in FIG. 7, the user can set the current position at the
destination via the operation unit 226 at the destination. It is preferable that the setting unit 222
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acquire the current position information of the audio reproduction device 200 from the
positioning unit 228 and input position information in the vicinity of the destination based on the
acquired position information. .
[0063]
[5.
Audio Reproducing Apparatus (Third Embodiment) Next, an audio reproducing apparatus
according to a third embodiment of the present invention will be described.
FIG. 8 is an explanatory view schematically showing a configuration of the audio reproduction
device according to the present embodiment.
[0064]
In FIG. 8, the audio reproduction device 300 includes a microphone 302, a microphone amplifier
304, a noise canceling (NC) filter circuit 306, a switch circuit 308, an adding circuit 310, a
headphone amplifier 312, and a headphone driver 314. Equipped with
These functions are similar to those of the microphone 102, the microphone amplifier 104, the
noise canceling (NC) filter circuit 106, the switch circuit 108, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 in the first embodiment described
above. Because of the configuration, these descriptions will be omitted.
[0065]
The audio reproduction device 300 further includes an audio signal input end 316 and a variable
amplification circuit 318. These also have the same functional configuration as the audio signal
input terminal 116 and the variable amplifier circuit 118 in the first embodiment described
above, and thus the description thereof is also omitted.
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17
[0066]
Further, the audio reproduction device 300 includes a control unit 320, an operation unit 334,
and a storage unit 336. The control unit 320 controls, for example, on / off of the switch circuit
308. The control unit 320 includes a setting unit 322, an audio direction determination unit 324,
an audio determination unit 326, a noise removal unit 328, an audio comparison unit 330, and a
notification control unit 332.
[0067]
The setting unit 322 sets an announcement voice for notifying arrival at a destination inputted
by the user via the operation unit 334 or a PC as an announcement voice of the destination. The
voice direction determination unit 324 determines the voice direction of the announcement voice
and the other voice in the voice signal supplied from the microphone amplifier 304. The voice
determination unit 326 determines, in the voice signal supplied from the microphone amplifier
304, the announcement voice and the other voice.
[0068]
The noise removing unit 328 removes voices other than the announcement voice from the voice
signal supplied from the microphone amplifier 304. The voice comparison unit 330 compares, in
the voice signal supplied from the microphone amplifier 304, the voice signal from which noise
is removed, that is, the announcement voice and the announcement voice of the destination set
by the setting unit 322. The notification control unit 332 notifies the user of arrival near the
destination, for example, immediately before arrival at the destination. For example, the
notification control unit 332 notifies the user of the arrival in the vicinity of the destination by
turning off the switch circuit 308 and turning off the noise canceling function of the audio
reproduction device 300.
[0069]
The operation unit 334 receives an operation input by the user. The storage unit 336 stores an
announcement voice for notifying arrival at a destination input by the user via the operation unit
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334 or a PC or the like, and the number of times of coincidence of announcement voices
described later.
[0070]
In the audio reproduction device 300 according to the present embodiment, the noise canceling
function is turned on by executing the first audio reproduction processing of FIG. 9 described
later or the second audio reproduction processing of FIG. In this case, it is possible for the user
on board the vehicle to know the getting-off timing.
[0071]
[6.
First Audio Reproduction Process (Third Embodiment) Next, a first audio reproduction process
performed by the audio reproduction device 300 of FIG. 8 will be described. FIG. 9 is a flowchart
of a first audio reproduction process performed by the audio reproduction device 300 of FIG.
[0072]
In FIG. 9, first, when an operation for turning on the noise canceling function of the audio
reproduction device 300 is performed by the user of the audio reproduction device 300 via the
operation unit 334, the control unit 320 turns on the switch circuit 308. Then, the noise
canceling function of the audio reproduction device 300 is turned on (step S302).
[0073]
Next, as shown in FIG. 11, for example, when an announcement voice for notifying arrival at a
destination is inputted by the user via the operation unit 334 or a PC or the like at home or
office, for example, the setting unit 322 is inputted The announcement voice is set as the
announcement voice of the destination (step S304).
An announcement voice for notifying arrival at a destination is an example of information on the
destination of the present invention.
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[0074]
Next, the voice determination unit 326 determines, in the voice signal supplied from the
microphone amplifier 304, the announcement voice and the other voice (step S306).
[0075]
Next, the noise removing unit 328 removes voices other than the announcement voice from the
voice signal supplied from the microphone amplifier 304 (step S308).
[0076]
Next, the voice comparison unit 330 compares the voice signal from which the noise is removed
in step S308, that is, the announcement voice with the announcement voice of the destination set
in step S304 (step S310).
[0077]
Next, the notification control unit 332 causes the announcement voice in the voice signal
supplied from the microphone amplifier 304 and the announcement voice of the destination set
in step S304 to be one based on the comparison result of the announcement voice by the voice
comparison unit 330. It is determined whether or not it is determined (step S312).
[0078]
If it is determined in step S312 that the announcement voices do not match (NO in step S312),
the process returns to step S306.
[0079]
As a result of the determination in step S312, when the announcement voices match (YES in step
S312), the notification voice of the destination usually flows immediately before the arrival at the
destination, so the notification control unit 332 performs the process shown in FIG. For example,
immediately before arrival at the destination, the switch circuit 308 is turned off and the noise
canceling function of the audio playback device 300 is turned off to notify the user of arrival
near the destination, as shown in FIG. Then (step S314), the process ends.
[0080]
According to the first audio reproduction process of FIG. 9, the noise canceling function is turned
off when the user turns on the noise canceling function and the announcement voice for
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notifying arrival to the destination flows. Therefore, the same effect as the above-described sound
reproduction process of FIG. 2 can be achieved.
[0081]
Further, in the first sound reproduction processing of FIG. 9, in the processing of step S306, the
sound direction determination unit 324 determines the sound direction of the announcement
sound and the other sound in the sound signal supplied from the microphone amplifier 304. By
doing this, the determination accuracy between the announcement voice and the other voice may
be improved.
As shown in FIG. 12, since the announcement voice normally flows from the upper direction of
the headphone device, the announcement voice flowing from the upper direction is formed by
forming directional microphones using the left and right microphones 302 of the headphone
device. It is possible to improve the determination accuracy of
[0082]
Furthermore, as shown in FIG. 13, by providing one or more microphones in addition to the left
and right microphones 302 in the headphone device, the determination accuracy of the
announcement voice flowing from above is further improved. It is also good.
In this case, the newly provided microphones may be provided at positions not intersecting the
axes passing through the left and right microphones 302.
[0083]
[7.
Second Audio Reproduction Process (Third Embodiment) Next, a second audio reproduction
process performed by the audio reproduction device 300 of FIG. 8 will be described.
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FIG. 10 is a flowchart of a second audio reproduction process performed by the audio
reproduction device 300 of FIG.
[0084]
In FIG. 10, first, when an operation for turning on the noise canceling function of the audio
reproduction device 300 is performed by the user of the audio reproduction device 300 via the
operation unit 334, the control unit 320 turns on the switch circuit 308. Then, the noise
canceling function of the audio reproduction device 300 is turned on (step S402).
[0085]
Next, as shown in FIG. 11, for example, when an announcement voice for notifying arrival at a
destination is inputted by the user via the operation unit 334 or a PC or the like at home or
office, for example, the setting unit 322 is inputted The announcement voice is set as the
announcement voice of the destination (step S404).
[0086]
Next, the voice determination unit 326 determines, in the voice signal supplied from the
microphone amplifier 304, the announcement voice and the other voice (step S406).
[0087]
Next, the noise removing unit 328 removes voices other than the announcement voice from the
voice signal supplied from the microphone amplifier 304 (step S408).
[0088]
Next, the voice comparison unit 330 compares the voice signal from which noise is removed in
step S408, that is, the announcement voice with the announcement voice of the destination set in
step S404 (step S410).
[0089]
Then, based on the comparison result of the announcement voice by the voice comparison unit
330, the notification control unit 332 determines that the announcement voice in the voice
signal supplied from the microphone amplifier 304 and the announcement voice of the
destination set in step S404 are one. It is determined whether or not it is determined (step S412).
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[0090]
As a result of the determination in step S412, when the announcement voices do not match (NO
in step S312), the notification control unit 332 determines whether a predetermined time has
elapsed (step S414).
[0091]
If it is determined in step S414 that the predetermined time has not elapsed (NO in step S414),
the process returns to step S406.
[0092]
If it is determined in step S414 that the predetermined time has elapsed (NO in step S414), the
process proceeds to step S422 described later.
[0093]
As a result of the determination in step S412, when the announcement voices match (YES in step
S412), the notification control unit 332 determines whether the number of times of agreement of
the announcement voices is the first (step S416).
[0094]
As a result of the determination in step S416, when the number of times of agreement of the
announcement voice is the first (YES in step S416), notification control unit 332 stores the
number of times of agreement in storage unit 336 (step S418). Return to processing.
[0095]
As a result of the determination in step S416, when the number of times of agreement of the
announcement voice is not the first time, that is, when the number of times of agreement of the
announcement voice is the second time (NO in step S416), the announcement voice of the
destination generally goes to the destination The notification control unit 332 switches the
notification to notify the user of arrival near the destination, for example, immediately before
arrival at the destination, as shown in FIG. The circuit 308 is turned off to turn off the noise
canceling function of the audio reproduction device 300 (step S420).
[0096]
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In the subsequent step S422, the notification control unit 332 clears the number of matches
stored in the storage unit 336 (step S422), and ends this processing.
[0097]
According to the second audio reproduction process of FIG. 10, when the noise canceling
function is turned on by the user and the announcement voice for notifying arrival at the
destination continuously flows twice, the noise canceling function Can be turned off, so that the
same effect as the sound reproduction processing of FIG. 2 described above can be achieved.
[0098]
[8.
Audio Reproducing Apparatus (Fourth Embodiment) Next, an audio reproducing apparatus
according to a fourth embodiment of the present invention will be described.
FIG. 14 is an explanatory view schematically showing a configuration of the audio reproduction
device according to the present embodiment.
[0099]
In FIG. 14, the audio reproduction device 400 includes a microphone 402, a microphone
amplifier 404, a noise canceling (NC) filter circuit 406, a variable amplification circuit 408, an
addition circuit 410, a headphone amplifier 412, and a headphone driver 414. And
The microphone 402, the microphone amplifier 404, the noise canceling (NC) filter circuit 406,
the adding circuit 410, the headphone amplifier 412, and the headphone driver 414 are the
microphone 102, the microphone amplifier 104, and the noise cancellation in the first
embodiment described above. Since the ring (NC) filter circuit 106, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 have the same functional configuration,
the description thereof will be omitted.
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[0100]
The variable amplification circuit 408 amplifies the noise canceling audio signal supplied from
the NC filter circuit 406.
The amplification factor of the variable amplification circuit 408 can be changed, and the
amplification factor is controlled by a control unit described later.
Then, the variable amplification circuit 408 supplies the amplified noise canceling speech signal
to the addition circuit 410.
[0101]
The audio reproduction device 400 further includes an audio signal input terminal 418, a
variable amplification circuit 420, an addition circuit 422, and a memory 424.
The audio signal input terminal 418 has the same functional configuration as the audio signal
input terminal 116 in the first embodiment described above, and thus the description thereof will
be omitted.
[0102]
The variable amplifier circuit 420 amplifies, for example, a music signal supplied via the audio
signal input terminal 418.
The amplification factor of the variable amplification circuit 420 can be changed, and the
amplification factor is controlled by a control unit described later.
Then, the variable amplification circuit 420 supplies the amplified music signal to the addition
circuit 422.
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[0103]
The addition circuit 422 adds the music signal supplied from the variable amplification circuit
420 and a notification sound signal supplied from the memory 424 described later to generate
an addition signal.
Then, the addition circuit 422 supplies the generated addition signal to the addition circuit 410.
[0104]
The memory 424 stores a notification voice signal.
Notification voice signals include beep sounds and other music signals, voice data of actors,
singers, voice actors, and the like.
Then, the memory 424 supplies the notification voice signal to the addition circuit 422 under the
control of the control unit described later.
[0105]
In addition, the audio reproduction device 400 includes a control unit having basically the same
functional configuration as the control unit in the first embodiment, the second embodiment, or
the third embodiment described above.
The control unit of the audio reproduction device 400 according to the present embodiment
controls the variable amplification circuits 408 and 420 and the memory 424 in order to notify
the user of arrival near the destination, the first embodiment described above. The second
embodiment differs from the control unit in the second embodiment, or the third embodiment.
Hereinafter, the case where the audio reproduction device 400 includes the control unit 120 and
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the like in the above-described first embodiment, that is, the control unit 120, the operation unit
128, the clock unit 130 and the like will be described.
[0106]
[9.
Audio Reproduction Processing (Fourth Embodiment) Next, the audio reproduction processing
executed by the audio reproduction device 400 of FIG. 14 will be described.
FIG. 15 is a flowchart of an audio reproduction process performed by the audio reproduction
device 400 of FIG.
[0107]
In FIG. 15, first, when an operation for turning on the noise canceling function of the audio
reproduction device 400 is performed by the user of the audio reproduction device 400 via the
operation unit 128, the control unit 120 causes the variable amplification circuit 408 to The
amplification factor is controlled to turn on the noise canceling function of the audio
reproduction device 400 (step S502).
[0108]
Next, the setting unit 122 sets a condition for notification of arrival near the destination input by
the user (step S504).
For example, in step S504, when the user inputs the time required to reach the vicinity of the
destination via the operation unit 128, the setting unit 122 sets the input time as the boarding
time.
[0109]
Next, when the notification control unit 126 satisfies the notification condition set by the setting
unit 122 in step S504 (step S506), the notification control unit 126 updates the processing state
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27
to [ready] (step S508).
[0110]
Next, the notification control unit 126 determines whether or not there is an interrupt operation
by the user via the operation unit 128 to stop the notification sound described later (step S510).
[0111]
As a result of the determination in step S510, when there is an interrupt operation by the user
(YES in step S510), the notification control unit 126 stops the supply of the notification sound
signal from the memory 424 (step S512).
[0112]
Next, the notification control unit 126 updates the processing state to [end] (step S514), and
returns to the processing of step S510.
[0113]
If it is determined in step S510 that the user has not performed an interrupt operation (NO in
step S510), the notification control unit 126 determines the processing state (step S516).
[0114]
As a result of the determination in step S516, when the processing state is [prepare], the
notification control unit 126 controls the amplification factor of the variable amplification circuit
420 to lower or mute the volume of the music signal (step S518). ).
In step S518, the volume control of the music signal may be controlled so that the music signal
fades out.
[0115]
Next, the notification control unit 126 determines whether the preparation process of step S518
is completed (step S520).
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[0116]
If it is determined in step S520 that the preparation process in step S518 is not completed (NO in
step S520), the process returns to step S510.
[0117]
As a result of the determination in step S520, when the preparation processing in step S518 is
completed (YES in step S520), the notification control unit 126 updates the processing state to
[notification] (step S522), and the processing in step S510 is performed. Return.
[0118]
As a result of the determination in step S516, when the processing state is [notification], the
notification control unit 126 controls the memory 424 to supply the notification sound stored in
the memory 424 to the addition circuit 422, and to notify The voice is reproduced (step S524).
[0119]
Next, the notification control unit 126 determines whether the notification process of step S524
is completed (step S526).
[0120]
If it is determined in step S526 that the notification process in step S524 has not been completed
(NO in step S526), the process returns to step S510.
[0121]
As a result of the determination in step S526, when the notification process in step S524 is
completed (YES in step S526), the notification control unit 126 updates the processing state to
[end] (step S528), and the process in step S510 is performed. Return.
[0122]
As a result of the determination in step S516, when the processing state is [end], the notification
control unit 126 controls the amplification factor of the variable amplification circuit 420 to
raise the volume of the music signal (step S530).
[0123]
Next, the notification control unit 126 determines whether the end process of step S530 is
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completed (step S532).
[0124]
If it is determined in step S532 that the ending process of step S530 has not been completed (NO
in step S532), the process returns to step S510.
[0125]
As a result of the determination in step S532, when the end process of step S530 is completed
(YES in step S532), the notification control unit 126 updates the processing state to [standby]
(step S534), and ends this process. .
[0126]
According to the voice reproduction process of FIG. 15, the notification voice is reproduced when
the noise canceling function is turned on by the user and the condition for notification of arrival
near the destination input by the user is satisfied. Ru.
In the audio reproduction device 400, when the notification sound is reproduced, the user can
know that the user has arrived in the vicinity of the destination by the reproduced notification
sound.
In addition, when the notification voice is reproduced, the user can wake up because the user's
sleep is disturbed by the reproduced notification voice, and the user can not pass the destination.
[0127]
As described above, according to the audio reproduction device of FIG. 15, when the noise
canceling function is turned on, it is possible for the user on the vehicle to grasp the getting-off
timing.
[0128]
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Further, in the audio reproduction process of FIG. 15, the noise canceling function may be turned
off as described above.
Furthermore, the variable amplification circuit 408 may be controlled to gradually cut off the
supply of the noise cancellation audio signal to the addition circuit 410.
[0129]
[10.
Audio Reproducing Device (Fifth Embodiment) Next, an audio reproducing device according to a
fifth embodiment of the present invention will be described.
FIG. 16 is an explanatory view schematically showing a configuration of the audio reproduction
device according to the present embodiment.
[0130]
In FIG. 16, the audio reproduction device 500 includes a microphone 502, a microphone
amplifier 504, a switch circuit 506, a noise canceling (NC) filter circuit 508, and a notification
noise canceling (NC) filter circuit 510. An adder circuit 512, a variable amplifier circuit 514, an
adder circuit 516, a headphone amplifier 518, and a headphone driver 520 are provided.
The microphone 502, the microphone amplifier 504, the noise canceling (NC) filter circuit 508,
the adding circuit 516, the headphone amplifier 518, and the headphone driver 520 are the
microphone 102, the microphone amplifier 104, and the noise cancellation in the first
embodiment described above. Since the ring (NC) filter circuit 106, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 have the same functional configuration,
the description thereof will be omitted.
[0131]
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31
The switch circuit 506 controls switching of the connection between the microphone amplifier
504 and the NC filter circuit 508 and the connection between the microphone amplifier 504 and
the notification-time NC filter circuit 510 by a control unit described later.
The notification-time NC filter circuit 510 is an example of a second generation unit according to
the present invention, and performs appropriate filtering processing on the audio signal supplied
from the microphone amplifier 504 to generate the NC-use filter circuit 508. A noise canceling
speech signal different from the noise canceling speech signal is generated.
Then, the notification-time NC filter circuit 510 supplies the generated noise canceling audio
signal to the addition circuit 512.
[0132]
The adder circuit 512 adds the noise canceling voice signal supplied from the NC filter circuit
508 and the noise canceling voice signal supplied from the notification NC filter circuit 510 to
generate a summed signal.
Then, the addition circuit 512 supplies the generated addition signal to the variable amplification
circuit 514.
The variable amplification circuit 514 amplifies the addition signal supplied from the addition
circuit 512.
The amplification factor of the variable amplification circuit 514 can be changed, and the
amplification factor is controlled by a control unit described later.
Then, the variable amplification circuit 514 supplies the amplified addition signal to the addition
circuit 516.
[0133]
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The audio reproduction device 500 further includes an audio signal input end 522 and a variable
amplification circuit 524.
These also have the same functional configuration as the audio signal input terminal 116 and the
variable amplifier circuit 118 in the first embodiment described above, and thus the description
thereof is also omitted.
[0134]
In addition, the audio reproduction device 500 includes a control unit having basically the same
functional configuration as the control unit in the first embodiment, the second embodiment, or
the third embodiment described above.
The control unit included in the audio reproduction device 500 in the present embodiment
mainly controls the switch circuit 506 in order to notify the user of the arrival of the user in the
vicinity of the destination, the first embodiment described above, the fourth embodiment. This
differs from the control unit in the second embodiment or the third embodiment.
[0135]
The control unit of audio reproduction device 500 in the present embodiment controls switch
circuit 506 in order to notify the user of arrival near the destination.
For example, in order to notify the user of arrival near the destination, the control unit controls
the switch circuit 506 so that the microphone amplifier 504 and notification from the connection
between the microphone amplifier 504 and the filter circuit for NC 508 are notified. It switches
to the connection with the filter circuit 510 for NC.
As a result, since different noise canceling speech signals are added to the music signal in the
adding circuit 516, the user's music listening environment changes.
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Therefore, the user can know that the user has arrived near the destination by the change in the
music listening environment.
[0136]
[11.
Audio Reproducing Apparatus (Sixth Embodiment)] Next, an audio reproducing apparatus
according to a sixth embodiment of the present invention will be described. FIG. 17 is an
explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
[0137]
In FIG. 17, the audio reproduction device 600 includes a microphone 602, a microphone
amplifier 604, a noise canceling (NC) filter circuit 606, a variable amplification circuit 608, and a
notification noise canceling (NC) filter circuit 610. , A variable amplification circuit 612, an
addition circuit 614, an addition circuit 616, a headphone amplifier 618, and a headphone driver
620. The microphone 602, the microphone amplifier 604, the noise canceling (NC) filter circuit
606, the adding circuit 616, the headphone amplifier 618, and the headphone driver 620 are the
microphone 102, the microphone amplifier 104, and the noise cancellation in the first
embodiment described above. Since the ring (NC) filter circuit 106, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 have the same functional configuration,
the description thereof will be omitted.
[0138]
The variable amplification circuit 608 amplifies the noise canceling speech signal supplied from
the NC filter circuit 606. The amplification factor of the variable amplification circuit 608 can be
changed, and the amplification factor is controlled by a control unit described later. Then, the
variable amplification circuit 608 supplies the amplified noise canceling speech signal to the
addition circuit 614. At the time of notification, the filter circuit for NC 610 performs appropriate
filtering processing on the audio signal supplied from the microphone amplifier 604, and for
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noise cancellation different from the audio signal for noise cancellation generated by the filter
circuit for NC 610. Generate an audio signal. Then, the notification-time NC filter circuit 610
supplies the generated noise canceling voice signal to the variable amplifier circuit 612.
[0139]
The variable amplification circuit 612 amplifies the noise canceling audio signal supplied from
the notification NC filter circuit 610. The amplification factor of the variable amplification circuit
612 can be changed, and the amplification factor is controlled by a control unit described later.
Then, the variable amplification circuit 612 supplies the amplified noise canceling speech signal
to the addition circuit 614. The adder circuit 614 adds the noise canceling audio signal supplied
from the variable amplification circuit 608 and the noise canceling audio signal supplied from
the variable amplification circuit 612 to generate an addition signal. Then, the addition circuit
614 supplies the generated addition signal to the addition circuit 616.
[0140]
Further, the audio reproduction device 600 includes an audio signal input terminal 622 and a
variable amplification circuit 624. These also have the same functional configuration as the audio
signal input terminal 116 and the variable amplifier circuit 118 in the first embodiment
described above, and thus the description thereof is also omitted.
[0141]
In addition, the audio reproduction device 600 includes a control unit having basically the same
functional configuration as the control unit in the first embodiment, the second embodiment, or
the third embodiment described above. The control unit included in audio reproduction
apparatus 600 in the present embodiment mainly controls the amplification factor of variable
amplification circuits 608 and 612 in order to notify the user of arrival in the vicinity of the
destination. The second embodiment differs from the control unit in the second embodiment or
the third embodiment.
[0142]
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The control unit of audio reproduction apparatus 600 in the present embodiment controls the
amplification factor of variable amplification circuits 608 and 612 in order to notify the user of
arrival near the destination. For example, the control unit controls the amplification factor of the
variable amplifier circuits 608 and 612 to notify the user of arrival near the destination, and the
noise canceling voice supplied from the filter circuit for NC 606 The amplification factor of the
signal and the amplification factor of the noise canceling audio signal supplied from the
notification-time NC filter circuit 610 are changed. As a result, since different noise canceling
speech signals are added to the music signal in the adding circuit 616, the user's music listening
environment changes. Therefore, the user can know that the user has arrived near the
destination by the change in the music listening environment.
[0143]
[12. Audio Reproducing Apparatus (Seventh Embodiment) Next, an audio reproducing
apparatus according to a seventh embodiment of the present invention will be described. FIG. 18
is an explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
[0144]
In FIG. 18, the audio reproduction device 700 includes a microphone 702, a microphone
amplifier 704, a noise canceling (NC) filter circuit 706, a monitor filter circuit 708, a switch
circuit 710, an adding circuit 712, and a headphone amplifier. 714 and a headphone driver 716.
The microphone 702, the microphone amplifier 704, the noise canceling (NC) filter circuit 706,
the adding circuit 712, the headphone amplifier 714, and the headphone driver 716 are the
microphone 102, the microphone amplifier 104, and the noise cancellation in the first
embodiment described above. Since the ring (NC) filter circuit 106, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 have the same functional configuration,
the description thereof will be omitted.
[0145]
The monitor filter circuit 708 is an example of a third generation unit of the present invention,
performs appropriate filtering processing on the audio signal supplied from the microphone
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amplifier 704, and outputs the audio signal supplied from the microphone amplifier 704.
Generate an emphasized monitoring audio signal. Then, the monitor filter circuit 708 supplies
the generated monitor audio signal to the switch circuit 710. The monitor filter circuit 708 may
emphasize only the announcement voice component in the voice signal supplied from the
microphone amplifier 704. The switch circuit 710 controls switching between connection of the
filter circuit for NC 706 and the addition circuit 712 and connection of the filter circuit for
monitoring 708 and the addition circuit 712 by a control unit described later.
[0146]
The audio reproduction device 700 further includes an audio signal input terminal 718 and a
variable amplification circuit 720. These also have the same functional configuration as the audio
signal input terminal 116 and the variable amplifier circuit 118 in the first embodiment
described above, and thus the description thereof is also omitted.
[0147]
In addition, the audio reproduction device 700 includes a control unit having basically the same
functional configuration as the control unit in the first embodiment, the second embodiment, or
the third embodiment described above. The control unit included in the audio reproduction
device 700 in the present embodiment mainly controls the switch circuit 710 to notify the user
of the arrival of the user in the vicinity of the destination, the first embodiment described above,
the fourth embodiment. This differs from the control unit in the second embodiment or the third
embodiment.
[0148]
The control unit of the audio reproduction device 700 in the present embodiment controls the
switch circuit 710 to notify the user of arrival near the destination. For example, in order to
notify the user of arrival near the destination, the control unit controls the switch circuit 710 to
connect the NC filter circuit 706 and the adder circuit 712 with the monitor filter circuit 708 and
It switches to the connection with the addition circuit 712. As a result, the monitor audio signal is
added to the music signal in the adder circuit 712, so that the user's music listening environment
changes. Therefore, the user can know that the user has arrived near the destination by the
change in the music listening environment. In addition, when the monitor audio signal is added
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to the music signal and the added signal is reproduced, surrounding noise is emphasized and the
user can know that he has arrived at the destination without missing the in-car announcement. it
can. In addition, when the monitor audio signal is added to the music signal and the added signal
is reproduced, the user can wake up because the emphasized ambient noise disturbs the user's
sleep, and the user passes by the destination. There is no need to worry.
[0149]
[13. Audio Reproducing Apparatus (Eighth Embodiment) Next, an audio reproducing
apparatus according to an eighth embodiment of the present invention will be described. FIG. 19
is an explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
[0150]
In FIG. 19, the audio reproduction device 800 includes a microphone 802, a microphone
amplifier 804, a noise canceling (NC) filter circuit 806, a variable amplification circuit 808, a
monitoring filter circuit 810, and a variable amplification circuit 812 An adder circuit 814, an
adder circuit 816, a headphone amplifier 818, and a headphone driver 820 are provided. The
microphone 802, the microphone amplifier 804, the noise canceling (NC) filter circuit 806, the
adding circuit 816, the headphone amplifier 818, and the headphone driver 820 are the
microphone 102, the microphone amplifier 104, and the noise cancellation in the first
embodiment described above. Since the ring (NC) filter circuit 106, the adder circuit 110, the
headphone amplifier 112, and the headphone driver 114 have the same functional configuration,
the description thereof will be omitted.
[0151]
The variable amplification circuit 808 amplifies the noise canceling audio signal supplied from
the NC filter circuit 806. The amplification factor of the variable amplification circuit 808 can be
changed, and the amplification factor is controlled by a control unit described later. Then, the
variable amplification circuit 808 supplies the amplified noise canceling speech signal to the
addition circuit 814. The monitor filter circuit 810 performs an appropriate filtering process on
the audio signal supplied from the microphone amplifier 804 to generate a monitor audio signal
in which the audio signal supplied from the microphone amplifier 804 is emphasized. Then, the
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monitor filter circuit 810 supplies the generated monitor audio signal to the variable amplifier
circuit 812. The monitor filter circuit 810 may emphasize only the announcement voice in the
voice signal supplied from the microphone amplifier 804.
[0152]
The variable amplifier circuit 812 amplifies the monitor audio signal supplied from the monitor
filter circuit 810. The amplification factor of the variable amplification circuit 812 can be
changed, and the amplification factor is controlled by a control unit described later. Then, the
variable amplification circuit 812 supplies the amplified monitoring audio signal to the addition
circuit 814. The addition circuit 814 adds the noise canceling audio signal supplied from the
variable amplification circuit 808 and the monitoring audio signal supplied from the variable
amplification circuit 812 to generate an addition signal. Then, the addition circuit 814 supplies
the generated addition signal to the addition circuit 816.
[0153]
Further, the audio reproduction device 800 includes an audio signal input end 822 and a variable
amplification circuit 824. These also have the same functional configuration as the audio signal
input terminal 116 and the variable amplifier circuit 118 in the first embodiment described
above, and thus the description thereof is also omitted.
[0154]
In addition, the audio reproduction device 800 includes a control unit having basically the same
functional configuration as the control unit in the first embodiment, the second embodiment, or
the third embodiment described above. The control unit included in audio reproduction
apparatus 800 according to the present embodiment mainly controls the amplification factor of
variable amplification circuits 808 and 812 in order to notify the user of arrival in the vicinity of
the destination. The second embodiment differs from the control unit in the second embodiment
or the third embodiment.
[0155]
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The control unit of audio reproduction apparatus 800 in the present embodiment controls the
amplification factor of variable amplification circuits 808 and 812 in order to notify the user of
arrival near the destination. For example, the control unit controls the amplification factor of the
variable amplifier circuits 808 and 812 to notify the user of arrival near the destination, and the
noise canceling voice supplied from the filter circuit 806 for NC. The amplification factor of the
signal and the amplification factor of the monitoring audio signal supplied from the monitoring
filter circuit 810 are changed. As a result, the monitor audio signal is added to the music signal in
the adder circuit 816, so the user's music listening environment changes. Therefore, the user can
know that the user has arrived near the destination by the change in the music listening
environment. In addition, when the monitor audio signal is added to the music signal and the
added signal is reproduced, surrounding noise is emphasized and the user can know that he has
arrived at the destination without missing the in-car announcement. it can. In addition, when the
monitor audio signal is added to the music signal and the added signal is reproduced, the user
can wake up because the emphasized ambient noise disturbs the user's sleep, and the user passes
by the destination. There is no need to worry.
[0156]
[14. Audio Reproducing Apparatus (Ninth Embodiment) Next, an audio reproducing
apparatus according to a ninth embodiment of the present invention will be described. FIG. 20 is
an explanatory view schematically showing a configuration of the audio reproduction device
according to the present embodiment.
[0157]
In FIG. 20, the audio reproduction apparatus 900 includes a microphone 902, a microphone
amplifier 904, an A / D conversion circuit 906, a DSP (Digital Signal Processor) 908, a D / A
conversion circuit 910, a headphone amplifier 912, and headphones. A driver 914 and an audio
signal input end 916 are provided. The microphone 902, the microphone amplifier 904, the
headphone amplifier 912, the headphone driver 914, and the audio signal input terminal 916 are
the microphone 102, the microphone amplifier 104, the headphone amplifier 112, the
headphone driver 114, and the audio signal input in the first embodiment described above. Since
the functional configuration is the same as that of the end 116, the description thereof is omitted.
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[0158]
The A / D conversion circuit 906 converts an analog audio signal supplied from the microphone
amplifier 904 into a digital audio signal. The A / D conversion circuit 906 supplies the converted
digital audio signal to the DSP 908. The DSP 908 implements processing for notifying the user of
the arrival in the vicinity of the destination in each of the above-described embodiments using a
digital filter or the like. The DSP 908 supplies the processed digital audio signal to the D / A
conversion circuit 910. The D / A conversion circuit 910 converts the digital audio signal
supplied from the DSP 908 into an analog audio signal. The D / A conversion circuit 910 supplies
the converted analog audio signal to the headphone amplifier 912.
[0159]
Further, an object of the present invention is to provide a system or apparatus with a storage
medium storing a program code of software for realizing the functions of the respective
embodiments described above, and a computer (or CPU or MPU etc.) of the system or apparatus.
Is also achieved by reading and executing the program code stored in the storage medium.
[0160]
In this case, the program code itself read from the storage medium realizes the functions of the
above-described embodiments, and the program code and the storage medium storing the
program code constitute the present invention. .
[0161]
Further, as a storage medium for supplying the program code, for example, a floppy (registered
trademark) disk, a hard disk, a magneto-optical disk, a CD-ROM, a CD-R, a CD-RW, a DVD-ROM, a
DVD-RAM, a DVD An optical disk such as RW and DVD + RW, a magnetic tape, a non-volatile
memory card, a ROM and the like can be used.
Alternatively, the program code may be downloaded via a network.
[0162]
Moreover, by executing the program code read by the computer, not only the functions of the
above-described embodiments are realized, but also an OS (Operating System) operating on the
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41
computer based on the instructions of the program code. And the like perform part or all of the
actual processing, and the functions of the above-described embodiments are realized by the
processing.
[0163]
Furthermore, after the program code read out from the storage medium is written to a memory
provided to a function expansion board inserted into the computer or a function expansion unit
connected to the computer, the expansion function is based on the instruction of the program
code. This also includes the case where the CPU or the like provided in the expansion board or
the expansion unit performs part or all of the actual processing, and the functions of the abovedescribed embodiments are realized by the processing.
[0164]
Although the preferred embodiments of the present invention have been described in detail with
reference to the accompanying drawings, the present invention is not limited to such examples.
It is obvious that those skilled in the art to which the present invention belongs can conceive of
various changes or modifications within the scope of the technical idea described in the claims.
Of course, it is understood that these also fall within the technical scope of the present invention.
[0165]
For example, the embodiments of the present invention can be combined as appropriate.
[0166]
DESCRIPTION OF SYMBOLS 100 audio reproduction apparatus 102 microphone 104
microphone amplifier 106 filter circuit for noise canceling (NC) 108 switch circuit 110 addition
circuit 112 headphone amplifier 114 headphone driver 116 audio signal input end 118 variable
amplifier circuit 120 control part 122 setting part 124 count part 126 Notification control unit
128 operation unit 130 clock unit 132 sensor unit 134 communication unit 136 communication
network 138 server
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