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DESCRIPTION JP2014100976

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DESCRIPTION JP2014100976
Abstract: A noise outside a vehicle can be introduced even when the gear position is switched to
"reverse" immediately after the ignition key switch is turned on to start the engine. An input
switch 36 inputs audio signals from a plurality of types of audio sources 26, 28, 30 and a
microphone unit 12 that can be switched by an input switching operation of an operator. The
arithmetic unit 54 controls the input switch 36 by software processing based on the input
switching operation of the operator, and causes the input switch 36 to output an audio signal of
the corresponding audio source. When the switching controller 20 receives a reverse signal, the
switching controller 20 controls the input switch 36 by hardware processing, and causes the
input switch 36 to output an audio signal from the microphone. [Selected figure] Figure 1
Car audio system with sound introduction function
[0001]
This invention relates to a car audio device having a function of introducing an external sound
collected by a microphone into a vehicle interior in conjunction with the gear position of the
vehicle being "reversed", A / V (audio / visual) With regard to an on-vehicle audio device with an
external sound introduction function such as a solid car navigation device, the external sound can
be introduced even when the gear position is turned "reverse" immediately after the ignition key
switch is turned on and the engine is started. The
[0002]
The following patent documents 1 to 3 have described the conventional vehicle outside sound
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introduction device.
The vehicle outside sound introduction device described in Patent Document 1 reproduces the
vehicle outside sound from a speaker by turning on a switch. The vehicle outside sound
introduction device described in Patent Document 2 is configured to reproduce the vehicle
outside sound from the speaker device when the vehicle outside sound matches the voice
registered in advance. The external sound introduction device described in Patent Document 3
turns on the microphone when the illuminance detected by the external illuminance sensor is
lower than a preset threshold or when the vehicle position is within a residential area and within
a set distance from the residential area The external sound is reproduced from the speaker
device.
[0003]
According to the vehicle exterior sound introduction device described in Patent Document 1, the
switch operation by the driver is necessary to introduce the vehicle exterior sound, and the
operation is troublesome. On the other hand, according to the vehicle exterior sound introduction
device described in Patent Documents 2 and 3, the introduction of vehicle exterior sound can be
controlled automatically according to the situation outside the vehicle. However, according to the
in-vehicle sound introduction device described in Patent Document 2, the in-vehicle sound can
not be introduced unless it matches the voice registered in advance. Further, according to the
vehicle exterior sound introduction device described in Patent Document 3, the vehicle exterior
sound is not detected if the illuminance detected by the vehicle exterior illuminance sensor is
equal to or less than a preset threshold or the vehicle position is not within a residential area or
within a set distance from the residential area. Could not introduce.
[0004]
Therefore, the applicant has previously introduced the vehicle external sound picked up by the
microphone into the vehicle compartment automatically in conjunction with the gear position of
the vehicle being "reversed" in Patent Document 4 below. Proposed a vehicle outside sound
introduction device. According to this, by introducing the vehicle outside sound into the vehicle
compartment at the time of reverse travel with a high risk of an accident, the traveling noise and
the horning noise of other vehicles traveling on the road, the voices of pedestrians walking on
the sidewalk, etc. And can increase the safety of the reverse.
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[0005]
Japanese Patent Application Laid-Open No. 60-65341 (Japanese Patent Application Laid-Open
No. 61-180836) A microfilm of Japanese Patent Application Laid-Open No. 8-22339 Japanese
Patent Application Laid-Open No. 2009-113528 Japanese Patent Application No. 2012-43103
[0006]
When moving a vehicle parked forward in a parking lot, the gear position is often switched to
"reverse" immediately after the ignition key switch is turned on to start the engine to start
reverse travel.
In such a case, since it takes time for the audio and navigation system to start up (the start-up
process is completed) after turning on the ignition switch, immediately after the engine is started
with the ignition key switch turned on. It has been found that even if the gear position is
switched to "reverse", there is a problem that the external noise can not be immediately
introduced.
[0007]
The present invention solves the above-mentioned problems, and even if the gear position is
switched to "reverse" immediately after the ignition key switch is turned on and the engine is
started, the vehicle outside sound can be introduced into the vehicle compartment It is an object
of the present invention to provide an on-vehicle audio apparatus with an external sound
introduction function.
[0008]
The on-vehicle audio apparatus with the vehicle external sound introduction function of the
present invention is a vehicle-mounted audio apparatus having an external vehicle sound
introduction function that reproduces the vehicle external sound collected by the microphone in
the vehicle interior. The audio signal from the audio source and the audio signal from the
microphone are input, and the audio signal from the audio source selected by the operator's
input switching operation and the audio signal from the microphone are switched and output
(from the microphone And an output circuit for reproducibly outputting the audio signal output
from the input switcher, and switching the audio signal from the other audio source to a mixed
signal of another audio source to the audio signal of the The input switcher is controlled by
software processing based on the input switch operation, and the sound of the audio source
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selected by the input switch operation from the input switcher The input switch is controlled by
hardware processing when an arithmetic unit for outputting a signal and a reverse signal
indicating that the gear position of the vehicle is turned "backward" are input, and the
microphone is operated from the input switch. And a switching controller for outputting an audio
signal from the
[0009]
According to the present invention, when a reverse signal indicating that the gear position of the
vehicle is turned to "reverse" is input, the input switch is controlled by hardware processing, and
an audio signal from the microphone from the input switch Even if the gear position is switched
to "reverse" before the system starts up by the software processing of the computing unit after
the ignition key switch is turned on and the engine is started. The noise outside the vehicle can
be immediately introduced into the vehicle cabin.
[0010]
In the present invention, when the reverse signal is input by the software processing, the
computing unit causes the input switching unit to output an audio signal from the microphone,
and the on-vehicle audio device is activated. A second control may be executed to invalidate the
control of the input switch by the switching controller when the first control becomes possible.
According to this, after the system has started up, it is possible to introduce an outside sound by
software processing by the computing unit.
In this case, when the in-vehicle audio device is activated and the first control becomes possible,
the computing unit executes the second control after starting the first control. be able to.
According to this, when external noise is introduced by hardware processing by the switching
controller when the system is started up, input switching device by the switching controller after
external noise introduction control by software processing by the arithmetic unit is started Since
the control of the control is invalidated, it is possible to prevent the introduction of the vehicle
exterior sound from being interrupted temporarily (the vehicle exterior sound is interrupted
temporarily) when the control is switched.
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[0011]
In the present invention, the input switcher inputs audio signals from a plurality of types of audio
sources that can be switched by the operator's input switching operation, and is selected by the
operator's input switching operation by software processing by the arithmetic unit. A first input
switch for outputting an audio signal from an audio source; an audio signal output from the first
input switch and an audio signal from the microphone; and hardware processing by the
switching controller; When the reverse signal is input, a mixing signal of an audio signal from the
microphone or an audio signal from the microphone and an audio signal output from the first
input switch is output, and the reverse signal is input. If not, it may comprise a second input
switch for outputting an audio signal output from the first input switch. According to this, the
vehicle outside sound can be introduced by hardware processing by the switching controller
before or after the system starts up.
[0012]
In the present invention, the output circuit includes an amplifier for amplifying an audio signal
output from the input switch, and the on-vehicle audio device stores a microphone memory for
storing a gain when the amplifier amplifies the audio signal from the microphone. And gain
setting means for reading the gain stored in the microphone memory by hardware processing
and setting the gain of the amplifier to the read gain, and the computing unit adjusts the
microphone playback volume of the operator Executes control to control the gain of the amplifier
by software processing based on operation to adjust the playback volume of the audio signal
from the microphone, and control to update the gain stored in the microphone memory to the
adjusted gain And the on-vehicle audio device is activated, and software processing by the Before
allowing in-control, the gain of the amplifier can be made is automatically set to the gain stored
in the microphone memory by hardware processing by the gain setting means. According to this,
even before the system starts up, it is possible to reproduce the outside sound at the microphone
volume adjusted last.
[0013]
The present invention can be applied to, for example, a car audio system or an A / V integrated
car navigation system. In particular, a great effect can be expected when applied to an A / V
integrated type car navigation system that requires a long time for the system to start up.
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[0014]
FIG. 3 is a system configuration block diagram showing an embodiment of a car navigation
device main body (hereinafter “car navigation main body”) 16 of FIG. 2; FIG. 7 is a plan view
showing an example of the arrangement of the microphone unit 12, the speaker device 14 and
the car navigation system main body 16 with respect to the vehicle in the embodiment in which
the present invention is applied to an A / V integrated type car navigation device. 10 is a
flowchart showing a reproduction control of a microphone signal executed by hardware
processing by the switching controller 20 when a reverse signal is input in the car navigation
main body unit 16 of FIG. 1 before completion of system startup processing. 10 is a flowchart
showing input switching control that is executed by software processing by an arithmetic unit 54
in the car navigation system main unit 16 of FIG. 1 after completion of system startup
processing. FIG. 7 is a flowchart showing gain setting value update control of a microphone
memory executed by software processing by an arithmetic unit 54 after completion of system
startup processing in the car navigation system main unit 16 of FIG. 1; FIG. It is a system
configuration block diagram showing another embodiment of an input switching device.
[0015]
Embodiments of the present invention will be described below. FIG. 2 shows an example of the
arrangement of the microphone, the speaker device, and the car navigation main body with
respect to the vehicle in the embodiment of the present invention. One microphone unit 12 is
installed outside the rear of the vehicle 10. The microphone unit 12 is configured, for example,
by housing the microphone body and the microphone amplifier in a waterproof structure to form
a unit, and exposing the diaphragm of the microphone body to the atmosphere. The microphone
unit 12 can be disposed, for example, in the gap of the shield rubber between the hatchback door
at the rear of the vehicle and the body, the gap of the shield rubber between the trunk lid and the
body, or the like. In the compartment of the vehicle 10, four speaker devices 14 are installed at
four corners (front left, right and rear left and right) of the vehicle interior. The car navigation
main body 16 is installed at an appropriate position in the vehicle interior (for example, a
dashboard in front of the vehicle interior). The car navigation main body 16 and the microphone
unit 12 are connected to each other by a microphone cable 13 laid in the vehicle 10. The car
navigation main body 16 and the speaker device 14 are connected to each other by a speaker
cable 15 laid on the vehicle 10. The car navigation main unit 16 is an A / V integrated type and
has a navigation function and a reproduction function of car audio (radio, television, CD, DVD,
etc.), and the sound of the navigation function can be The audio of the car audio reproduction
function is stereoscopically reproduced from the four speaker devices 14 in all directions. A
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sound collection signal (microphone signal) of the external sound collected by the microphone
unit 12 is transmitted to the car navigation main body 16 through the microphone cable 13. The
car navigation system main unit 16 reproduces this microphone signal from, for example, the
two speaker devices 14 at the rear left and right in accordance with the installation position of
the microphone unit 12 being at the rear of the vehicle. Alternatively, reproduction may be
performed from the two front left and right speaker devices 14 or all four speaker devices 14. As
a result, the external noise is introduced into the passenger compartment.
[0016]
The system configuration of the car navigation main body 16 is shown in FIG. The car navigation
main unit 16 mainly adds a switching controller 20 and a non-volatile microphone memory 22
such as a flash memory to the car navigation main unit of the A / V integrated type car
navigation system with external sound introduction function proposed in Patent Document 4 To
make a change.
[0017]
The following signal or power is input to the car navigation main unit 16. Vehicle speed pulse
signal: An output pulse signal (vehicle speed signal) of a vehicle speed sensor that generates a
pulse each time the tire of the vehicle rotates by a predetermined angle. • Reverse signal: A signal
in which the gear position is +12 V in "reverse" and 0 V in other gear positions. Dimmer signal: A
signal whose light switch is "+12 V" at the position of "headlight" or "headlight" and 0 V at "off"
position. • ACC power supply: A power supply that turns +12 V when the key position of the
ignition key switch is “ACC” (accessory) or “on”, and 0 V at other key positions.
[0018]
The signal or power is input to the input filter 66, and the input filter 66 notifies the calculator
54 of the state of these signals or power. The reverse signal is also supplied to the switching
controller 20 in addition to the computing unit 54. The display 72 performs map display of the
navigation function, reproduction image display of the DVD, touch panel display for various input
operations, and the like. The stabilized power source 74 is connected between the + B power
source (power source always at +12 V) and GND (always ground potential) of the battery 76, and
creates a power source for driving each part of the car navigation main body 16 from the + B
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power source ( Power supply lines other than the power supply lines of the computing unit 54
and the microphone unit 12 are not shown). When the key position of the ignition key switch is
set to "ACC" or "ON", power is supplied to each part of the car navigation main body 16.
[0019]
The microphone unit 12 is shown in FIG. 1 when a condenser microphone is used. The power
supply line 40, the signal line 42, and the shield line 44 constituting the microphone cable 13 of
the microphone unit 12 are connected to the power supply terminal 46, the microphone signal
input terminal 48, and the ground terminal 50 of the car navigation main unit 16, respectively.
The bias voltage of the microphone unit 12 is supplied from the stabilized power supply 74 via
the microphone power switch 78, the power supply terminal 46, and the power supply line 40.
The microphone power switch 78 is turned on when the on signal is supplied from the switching
controller 20 or the computing unit 54, and is turned off when the on signal is not supplied.
When the microphone power switch 78 is turned on, the sound pickup signal (microphone
signal) of the microphone unit 12 is switched as one of the audio source signals through the
signal line 42, the microphone signal input terminal 48, and the AUX (auxiliary) input unit 52.
Are input to the signal generator 36.
[0020]
The car navigation main body 16 includes various switches 68 for an operator such as a driver to
operate the car navigation main body 16, and a reproduction volume adjustment volume 70 for
the operator to adjust the reproduction volume of the audio source. The microphone memory 22
stores the latest (finally adjusted) microphone volume (gain of the preamplifier 56).
[0021]
A computing unit (CPU, microcomputer) 54 controls each part of the car navigation main body
16 by software processing (that is, calculation processing based on a program). The arithmetic
unit 54 is in the state of the signal or power source (vehicle speed pulse signal, reverse signal,
dimmer signal, ACC power source, etc.) and various switches 68, remote control transmitter,
touch panel displayed on the display 72, volume control 70 for playback volume control. Each
part of the car navigation main body 16 is controlled in accordance with the operation or the
like. The car navigation main unit 16 includes various source devices such as a tuner (AM / FM
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radio) 26, a CD / DVD deck 28, a car navigation function unit (vehicle guidance system unit) 30,
and the like. The tuner 26 receives the signal received by the antenna 32. A signal received by
the GPS antenna 34 is supplied to the car navigation function unit 30. Audio source signals
output from the tuner 26, the CD / DVD deck 28, and the car navigation function unit 30 are
input to the input switch 36.
[0022]
The input switching unit 36 performs switching control of the input source according to an
instruction from the computing unit 54 or the switching controller 20 (not only when completely
switching from one source to another source, but from one source to another source) (Including
the case of switching to the mixing signal of Control of the input switch 36 by the switching
controller 20 is performed as follows. When the switching controller 20 is turned on, the system
is ready to switch the input switch 36 even if the system startup process (audio or navigation
system startup) has not been completed. When input, the microphone power switch 78 is turned
on by hardware processing (that is, processing executed by the circuit configuration without
depending on the CPU), and the input switching of the input switch 36 is a microphone signal
(AUX) And the input switch 36 outputs a microphone signal.
[0023]
Control of the input switch 36 by the computing unit 54 is performed as follows. The control of
the input switch 36 by the computing unit 54 is not started unless the system startup process is
completed. Arithmetic unit 54 becomes capable of switching control of input switch 36 when the
system startup processing is completed, and the software processing is performed by software
processing based on the input switching operation by the remote control transmitter or the touch
panel displayed on display 72 by the operator. The switch 36 is switch-controlled to output the
audio signal of the audio source selected by the input switch operation from the input switch 36.
When the arithmetic unit 54 receives a reverse signal, the microphone power switch 78 is turned
on by software processing, and the input switch 36 is switched and controlled to mix the
microphone signal (or the microphone signal and the source signal that has been output so far).
Signal is output, and the switching controller 20 is disabled to invalidate the control of the
microphone power switch 78 and the input switch 36 by the switching controller 20. Therefore,
different switching instructions are not simultaneously input to the input switching unit 36 from
the switching controller 20 and the computing unit 54. When the reverse signal is continuously
input from before completion to after completion of the system startup processing, the switching
instruction to the microphone signal to the input switching unit 36 switches from the instruction
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by the switching controller 20 to the instruction by the computing unit 54 The microphone
signal is continuously output from the input switch 36 without interruption.
[0024]
The audio signal output from the input switch 36 is led to the speaker output terminal 60 of each
channel through the preamplifier 56 and the power amplifier 58 of each channel (front left, front
right, rear left, rear right). The speaker devices 14 of the respective channels are connected to
the speaker output terminals 60 via the speaker cables 15, respectively. The speaker device 14
of each channel reproduces the audio signal of the corresponding channel.
[0025]
The volume adjustment of the microphone signal is performed, for example, as follows
independently of the volume adjustment of the other sources 26, 28, 30. When the gain is not
instructed from the computing unit 54 (that is, before the system startup processing is
completed), the preamplifier 56 performs hardware processing as gain setting means on the
condition that the gain is not instructed from the computing unit 54. The gain value stored in the
microphone memory 22 is read out, and its own gain is fixedly set to the gain. When the start-up
process of the system is completed and the reverse signal is input, the arithmetic unit 54 reads
out the gain value initially stored in the microphone memory 22 and initializes the gain of the
preamplifier 56 to that value. That is, at this time, since the gain is instructed from the computing
unit 54 in the preamplifier 56, the gain setting by hardware processing by the gain value stored
in the microphone memory 22 is invalidated, and the preamplifier 56 is software-processed by
the computing unit 54. It is set to the gain instructed from the computing unit 54. Thereafter,
when the user operates the playback volume adjustment volume 70 to readjust the microphone
volume while the reverse signal continues to be input, the gain of the preamplifier 56 responds
to the operation according to the instruction from the computing unit 54. At the same time, the
gain value stored in the microphone memory 22 is updated to the readjusted gain value.
[0026]
The external sound introduction control by the A / V integrated type car navigation system of
FIG. 1 will be described. << Control before completion of system startup processing after power
on >> Figure 3 shows the control before completion of system startup processing after switching
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the key position of the ignition key switch from "OFF" to "ACC" or "ON" Show. This control is
executed by the switching controller 20 by hardware processing. When the key position of the
ignition key switch is switched from "OFF" to "ACC" or "ON", power is supplied from the stabilized
power supply 74 to each part, and the switching controller 20, input switch 36, microphone
memory 22, preamplifier 56 The power amplifier 58 and the like become operable, but until the
start-up process is completed, the input switching control of the input switch 36 by the
computing unit 54 and the navigation control are in a standby state. When the gear position is
switched to "reverse" during the system startup process and a reverse signal is input ("Yes" in
S1), the switching controller 20 immediately turns on the microphone power switch 78 by
hardware processing ( S2), the output of the input switch 36 is switched to the microphone
signal (S3). The preamplifier 56 sets the gain to the gain value stored in the microphone memory
22 (S4). As a result, the external sound is reproduced from the speaker device 14 at a volume
corresponding to the gain value set in the microphone memory 22. When the gear position is
switched from "reverse" to another position, the reverse signal is turned off ("NO" in S1), the
microphone power switch 78 is turned off, and the introduction of the vehicle external sound is
ended.
[0027]
<< Control after completion of system startup processing >> FIG. 4 shows control after
completion of the system startup processing. This control is executed by the computing unit 54
in software processing. When the system startup process is completed, the standby state of the
input switching control of the input switch 36 and the navigation control is released, and control
of each part of the car navigation main body 16 is performed by the computing unit 54. When
the reverse signal is turned off ("No" in S11), the audio source is switched according to the
source switching operation of the operator. That is, when "tuner" is selected ("Yes" in S12), it is
switched to the tuner (S13), and when "CD / DVD deck" is selected ("Yes" in S14), it is switched to
the CD / DVD deck (S15), and when "Navigation" is selected ("Yes" in S16), the navigation is
switched to (S17). When the gear position is switched to "reverse" and the reverse signal is
turned on ("Yes" in S11), the microphone power switch 78 is turned on (S18), and the sound of
the source being output is cut or leveled down (S19) ), The input switch 36 is switched to a
microphone signal (or a mixing signal of the microphone signal and the source signal output so
far) (S20). As a result, the external sound is reproduced from the speaker device 14. At this time,
the reproduction volume of the microphone signal is instructed by the computing unit 54 (S21).
Thereafter, the computing unit 54 renders the switching controller 20 inoperable, and invalidates
the control of the microphone power switch 78 and the input switching unit 36 by the switching
controller 20 (S22). When control is switched to the control by the computing unit 54, it is
possible to readjust the playback volume by the playback volume adjustment volume 70. When
the reverse signal is continuously input from before completion to after completion of the system
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startup processing, the on instruction to the microphone power switch 78 is switched from the
instruction by the switching controller 20 to the instruction by the computing unit 54, and the
input switching Since the switching instruction to the microphone signal to the unit 36 is
switched from the instruction by the switching controller 20 to the instruction by the computing
unit 54, the microphone signal is continuously output from the input switching unit 36 without
interruption.
[0028]
<< Update Control of Microphone Memory 22 >> FIG. 5 shows update control of the microphone
memory 22. This control is executed in software processing by the computing unit 54 after the
system startup processing is completed. When the operator adjusts the volume of the
microphone signal with the volume control 70 for playback volume adjustment during playback
of the microphone signal (S31), the gain value at that time is stored in the microphone memory
22 instead of the previous gain value (S32) ).
[0029]
Another embodiment of the input switch is shown in FIG. This is because the embodiment of FIG.
1 introduces an external sound by hardware processing by the switching controller 20 before the
system starts up, and introduces an external sound by software processing by the computing unit
54 after the system starts. On the other hand, the vehicle outside sound is introduced by
hardware processing by the switching controller 20 before or after the system starts up. The
same reference numerals are used for the parts corresponding to the parts in FIG. The
configuration other than the portion illustrated in FIG. 6 of this embodiment is the same as that
of FIG. The input switch 36 comprises a first input switch 36-1 and a second input switch 36-2.
The first input switch 36-1 receives audio signals from the tuner 26, the CD / DVD deck 28, and
the car navigation function unit 30 that can be switched by the input switching operation of the
operator, and is operated by software processing by the computing unit 54. The audio signal
from the audio source selected by the input switching operation of the person is output. The
second input switch 36-2 receives the audio signal and the microphone signal output from the
first input switch 36-1, and when the reverse signal is input by hardware processing by the
switching controller 20. A microphone signal (or a mixing signal of a microphone signal and an
audio signal output from the first input switch) is output, and when a reverse signal is not input,
the audio signal output from the first input switch 36-1 is Output.
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[0030]
In the above-described embodiment, the microphone memory is processed by the hardware
processing as gain setting means on the condition that the preamplifier 56 is not instructed by
the operator 54 of gain (that is, the system startup processing is not completed). Although the
gain stored in 22 is read and its own gain is set to the read gain, the gain setting means is not
limited to being realized by the preamplifier 56. For example, in parallel with the switching
controller 20 issuing a switching command to the input switching device 36, the reading process
is issued to the microphone memory 22 by hardware processing, and the gain of the preamplifier
56 is read out. It can also be set to a different gain. In this case, the gain setting means is realized
by the switching controller 20. In addition to this, the microphone memory 22 is provided by
hardware processing, provided that gain setting means is provided independently and no
instruction is issued from the computing unit 54 (ie, the system startup processing is not
completed). The gain stored in may be read out and the gain of the preamplifier 56 may be set to
the read out gain. Further, although the vehicle outside sound is introduced only at the time of
reverse travel in the above embodiment, in addition to the automatic introduction at the time of
reverse travel, the vehicle outside sound is introduced by an arbitrary input switching operation
(manual introduction operation) by the operator. You can also
[0031]
Reference Signs List 10 vehicle 12 microphone unit (microphone) 14 speaker device 16 main
unit (car navigation main unit) of A / V integrated car navigation device (car audio device) 20
switching controller 22 microphone Memory, 36: input switching device, 36-1: first input
switching device, 36-2: second input switching device, 54: computing device, 56: preamplifier
(amplifier, output circuit, gain setting means), 58: power Amplifier (Amplifier, output circuit)
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