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DESCRIPTION JPH05172619

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DESCRIPTION JPH05172619
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
control circuit for controlling the volume of a notification sound for controlling the volume of a
notification sound such as a beep sound or an alarm sound for alerting a user or an
announcement sound for providing information. It is.
[0002]
In recent years, various devices such as facsimile machines and personal computers have been
installed not only in offices and factories but also in homes, and from each device for
confirmation of user operation and notification of processing termination and abnormalities, etc.
Various notification sounds are being generated. In addition, in crowded places such as train
stations, train cars and underground roads, various types of information are announced in order
to transmit information to a large number of unspecified users for convenience.
[0003]
In this way, voice notification is used in various scenes of modern life, and in order to transmit
information to users more effectively and comfortably for devices and systems that generate
notification voice, Detailed human interface technology is needed.
[0004]
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2. Description of the Related Art As a method of effectively transmitting information to a user,
there is a method of setting different volumes according to the types of notification sounds.
[0005]
In this case, the volume of each notification sound may be set in consideration of the urgency to
be transmitted to the user.
For example, in the facsimile apparatus, when the user inputs the telephone number of the
transmission destination, it is considered that the user is near the device, so a notification of
small volume is required to confirm the input operation by the user. It is enough to generate a
sound.
On the other hand, as in the case where the recording paper runs out during reception, an alarm
sound that requests the user to perform a predetermined operation or indicates that an
abnormality has occurred is regardless of whether the user is near or not. Because it needs to be
surely transmitted to the user, a large volume is necessary.
[0006]
Furthermore, it is equipped with a changeover switch or volume that changes the volume of
notification sound in stages, and by adjusting the volume according to the average noise level at
the installation site or the user's hearing sensitivity, etc., the surrounding environment and use It
was intended to cope with the individuality of the people.
[0007]
There is also a method of changing the volume of the notification sound depending on the time
or stopping the generation of the notification sound by paying attention to the temporal change
of the environment, and a ring tone when a call arrives at night in a facsimile machine etc. Is
used as a method to control
Thereby, while sleeping, the user's request to be comfortable without being bothered by the ring
tone and the like is satisfied.
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[0008]
By the way, the noise level at the place where each device is installed is not constant in the office
or the factory, and changes depending on the date and time according to the change of the
surrounding environment. It is normal. However, in the above-described conventional notification
sound adjustment method, the volume of the notification sound is fixed regardless of the change
in the surrounding environment unless the user changes the setting of the volume. Therefore, for
example, if the volume of the notification sound is set based on the noise level when various
manufacturing devices are in operation in the factory, the notification sound is louder than
necessary during lunch break etc. and the user is notified. It gives excessive stress. Conversely, if
the volume of the notification sound is set based on the noise level in a state where the
manufacturing apparatus is not in operation, then it may not be possible to notify the user of an
abnormality of the apparatus or the like when necessary.
[0009]
In such a case, it is troublesome for the user to judge the surrounding environment and reset the
volume of the notification sound one by one. In addition, if the environment changes at the same
time every day, such as lunch break and working hours, it is possible to cope with it using
technology that changes the volume of notification sound depending on the time, but with this
method, the noise level is irregularly Can not respond if
[0010]
An object of the present invention is to provide a volume control circuit of notification sound that
automatically changes the volume of notification sound according to a change in environment.
[0011]
FIG. 1 is a diagram showing the configuration of the volume control circuit of notification sound
of claims 1 and 2. In FIG.
[0012]
The invention according to claim 1 comprises an amplification means 111 for amplifying the
notification voice signal at a designated amplification factor, and the volume control circuit of
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notification voice configured to input the output of the amplification means 111 to the voice
output means 101 A microphone 112 for collecting sound in a predetermined range around the
output means 101; and a noise level measurement means 113 for obtaining a noise level
indicating the magnitude of noise around the audio output means 101 based on the output of the
microphone 112; And an amplification factor designating means 114 for designating the
corresponding amplification factor to the amplification means 111 according to the input of the
noise level.
[0013]
According to the invention of claim 2, in the sound volume control circuit of notification sound of
claim 1, the noise level measurement unit 113 detects the peak value of the output of the
microphone 112 according to the peak detection unit 121 and the input of the notification sound
signal. And a peak holding unit 122 for holding the peak value detected by the peak detection
unit 121 and transmitting the peak value to the amplification factor designation unit 114 as a
noise level.
[0014]
FIG. 2 is a diagram showing the configuration of the volume control circuit of notification sound
of claim 3.
According to the invention of claim 3, in the volume control circuit of notification sound
according to claim 1, the noise level measurement means 113 filters the filter 131 for removing
the frequency component of the sound output from the sound output means 101 from the output
of the microphone 112; And peak detection means 132 for detecting the peak value of the
output of
[0015]
According to the first aspect of the present invention, the noise level measuring means 113
evaluates the magnitude of the noise around the voice output means 101 according to the
magnitude of the voice collected by the microphone 112, and the amplification factor
designating means 114 By designating the amplification factor corresponding to the level to the
amplification means 111, it is possible to change the amplification factor of the notification voice
signal according to the size of the noise around the voice output means 101.
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Thereby, the volume of the notification sound generated by the sound output unit 101 can be
changed according to the change of the surrounding environment.
[0016]
According to the second aspect of the present invention, the peak detection means 121 and the
peak holding means 122 evaluate the magnitude of the noise around when the notification voice
signal is input, and amplify the amplification factor corresponding to the magnitude of the noise.
Since the designation is made to the means 111, the volume of the notification voice can be
controlled in consideration of the surrounding environment at the time of outputting the
notification voice.
Further, according to the third aspect of the present invention, since the frequency component of
the output voice from the voice output means 101 is removed by the filter 131, the peak
detection means 132 outputs the surrounding voice while the voice output means 101 is
outputting the notification voice. The noise level can be measured, and changes in the noise level
can be reflected in the volume of the notification sound during this time.
[0017]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will now be described in detail with reference to the drawings.
FIG. 3 shows the configuration of an embodiment of a facsimile apparatus to which the volume
control circuit of claim 2 is applied.
[0018]
In FIG. 3, the facsimile apparatus mutually communicates the reading unit 201, the image
memory 202, the compression / decompression unit 203, the modem 204, the network control
unit (NCU) 205, the recording unit 206, and the microprocessor (MPU) 207 via a bus. , And is
connected to the line via the network control unit 205.
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[0019]
The microprocessor 207 controls the above-described units to perform normal transmission and
reception operations, and generates a notification sound such as a ring tone or an alarm to the
sound signal generation circuit 208 in response to a request from the units. Is configured to
instruct generation of a notification sound signal.
[0020]
The audio signal generation circuit 208 is configured to generate an audio signal of a frequency
(or a combination of a plurality of frequencies) corresponding to a notification sound designated
by an instruction from the microprocessor 207 and output it as a notification audio signal. .
Further, the notification sound signal is input to the speaker 221 corresponding to the sound
output unit 101 through the volume control circuit 210.
[0021]
In FIG. 3, the microphone 112 is disposed close to the speaker 221 and configured to collect
sound around the speaker 221.
Further, the output signal of the microphone 112 is input to the peak hold circuit 212 of the
volume control circuit 210 through the amplifier 211.
[0022]
The peak hold circuit 212 is formed of a diode 213, two switches 214a and 214b, two resistors
215a and 215b, and a capacitor 216. The output of the microphone 112 described above is
input to the diode 213, and the output terminal of the diode 213 is connected to one end of the
resistor 215a via the switch 214a. Further, the other end of the resistor 215a is connected in
parallel to the capacitor 216 and the resistor 215b and the switch 214b and is grounded.
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[0023]
That is, the peak hold circuit 212 operates as the peak detection means 121 in a state in which
both of the switches 214a and 214b are closed, and holds the charge of the capacitor 216 by
opening the switches 214a and 214b. , 214b, and stores the potential difference corresponding
to the peak value of the output of the microphone 112 immediately before opening the same,
and operates as the peak holding means 122, and outputs this potential difference as a noise
level.
[0024]
The switches 214a and 214b described above are configured to open and close in response to a
control signal to the control terminal S provided in each, and the microprocessor 207 generates a
notification sound signal to the sound signal generation circuit 208. At the time of instructing, a
control signal for instructing the switches 214a and 214b to be in the open state is input.
[0025]
Here, since the peak value of the output of the microphone 112 indicates the magnitude of the
amplitude of noise around the facsimile apparatus, the level of the peak value of the output of the
microphone 112 indicates the ambient noise level.
Therefore, as described above, by operating the switches 214a and 214b, the peak hold circuit
212 performs the function of the noise level measuring means 113, and the noise level around
the speaker 221 immediately before generating the notification sound is can get.
Further, this noise level is sent to the amplification factor specifying means 114.
[0026]
In FIG. 3, the amplification factor specifying means 114 compares the noise level with at least
one threshold value by the comparison part 217, and the amplification factor determination part
218 adjusts the initial value of the amplification factor and the adjustment value corresponding
to the above comparison result. , To obtain an amplification factor adapted to the noise level, and
to send it to an amplifier 219 corresponding to the amplification means 111.
[0027]
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Here, as the initial value of the amplification factor, a value set by the user via a changeover
switch or a volume may be used.
In addition, when different sound volumes are set according to the type of notification sound, the
initial value for each notification sound is held in amplification factor determination unit 218,
and the type of notification sound designated by microprocessor 207 is stored. The amplification
factor may be determined using the corresponding initial value.
[0028]
As a result, the notification voice signal amplified at the amplification factor adapted to the noise
level is sent to the speaker 221 by the above-described amplifier 219, and the notification voice
of the volume corresponding to the amplification factor is output by the speaker 221. Ru.
[0029]
In this way, according to the noise level around the facsimile apparatus at the time of starting to
generate the notification sound, the ambient environment changes by changing the amplification
factor when the amplifier 219 amplifies the notification voice signal. Accordingly, the volume of
the notification sound generated by the speaker 221 can be automatically changed.
[0030]
However, in this case, since the peak hold circuit 212 holds the value of the noise level at the
time of starting the generation of the notification sound, the amplification factor of the
notification sound signal by the amplifier 219 is maintained constant during the generation of
the notification sound. The speaker 221 generates a notification sound of a constant volume.
[0031]
In addition, as described above, the adjustment value of the amplification factor corresponding to
the noise level is added to the initial value of the amplification factor to obtain the final
amplification factor, so that the volume of the notification sound is the initial amplification factor.
The noise level can be increased by the value.
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Therefore, the notification sound is not overwhelmed by the ambient noise, and it is possible to
prevent the user from being stressed by the generation of an extremely loud sound.
[0032]
As a result, even when the noise level around the facsimile apparatus changes irregularly
depending on the date and time, the notification sound of appropriate volume can be generated
at all times, so that the user can receive an incoming call or an alarm. You can be notified surely
and comfortably.
[0033]
If a filter adapted to human auditory sensitivity is inserted between the amplifier 211 and the
peak hold circuit 212 and the peak hold circuit 212 holds the peak value of the output of this
filter, human auditory sense Since the noise level can be evaluated in consideration of the
frequency characteristic of the sensitivity, the volume of the notification sound can be controlled
to a more appropriate volume.
[0034]
Further, as shown in FIG. 4, if the clamp circuit 224 and the limiter 226 are connected in parallel
on the output side of the amplifier 211, the DC component of the output of the amplifier 211 is
stabilized at the set potential of the clamp setting unit 225. Also, the amplitude of the AC
component is limited according to the setting of the limit setting unit 227 and then sent to the
peak hold circuit 212.
Therefore, the volume control circuit can be operated more stably.
[0035]
The volume control circuit of claim 2 has a configuration for inputting a notification voice signal
through the volume control circuit 210 to a speaker or a buzzer provided as the voice output unit
101 as in the above-described example of the facsimile apparatus. If so, it can be applied to
volume control of notification sounds of various OA devices and home appliances.
[0036]
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Further, a volume control circuit 210 is added to each of the speakers incorporated in the
announcement system of the station, department store or the like, and a notification sound signal
from the central control device is inputted to the speakers through the volume control circuit
210. If so, information can be provided to the user at an appropriate volume according to the
difference in noise level depending on the location of the speaker.
That is, on the speaker side, the volume may be adjusted in consideration of an environment such
as whether the installation place is a crowded place like a train station's home during rush hour,
or conversely it is a quiet place with few people. As it is possible, the central control unit need
not be aware of the volume of each place, and can provide information to the user reliably and
comfortably.
[0037]
Here, the volume control circuit of claim 2 generates the notification sound on the assumption
that the surrounding environment does not drastically change before and after the notification
sound is generated and the noise level before and after the generation of the notification sound is
substantially constant. Since the volume of the notification sound is changed according to the
previous noise level, it is suitable when the change in the environment is relatively gentle.
[0038]
Next, a method to flexibly cope with a drastic change in the surrounding environment before and
after generating the notification sound will be described.
FIG. 5 shows the construction of an embodiment of the sound volume control circuit of the third
aspect.
[0039]
Hereinafter, parts in common with the respective parts shown in FIG. 3 will be described with the
same reference numerals as in FIG.
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In FIG. 5, the output of the microphone 112 is input to the filter 131 via the amplifier 211.
[0040]
In the filter 131, a pair of a plurality of notch filters 2311 to 231n and bypass paths 2321 to
232n transmitting all frequency components is connected in series via two switches provided on
both sides of each.
Further, the selector 233 inputs an instruction to each switch according to the input of the
notification voice type, connects the two switches corresponding to the corresponding pair to the
terminal a side, and switches the switch corresponding to the other pair to the terminal b It is
configured to connect to the side.
[0041]
That is, in the pair including the notch filter 231 that removes the frequency corresponding to
the type of notification voice by the selector 233 controlling the switch, the input signal is
transmitted to the subsequent pair via the notch filter 231 and another pair In this case, the
signal is transmitted to the subsequent pair as it is via the bypass path 232, and only the
corresponding frequency component is removed.
[0042]
Thus, while the notification sound is being generated by the speaker 221, it is possible to send to
the peak detection means 132 a signal obtained by removing the frequency component of the
notification sound from the output signal of the microphone 112.
[0043]
The peak detection means 132 has a configuration obtained by removing the two switches 214a
and 214b from the peak hold circuit 212 shown in FIG. 3, and directly connects the diode 213
and the resistor 215a, and directly connects the resistor 215b. It is configured to be grounded.
Therefore, the capacitor 216 is charged with a time constant determined by the resistance value
R1 of the resistor 215a and the capacitance C of the capacitor 216, and the charge stored in the
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capacitor 216 is calculated with a time constant determined by the resistance value R2 of the
resistor 215b and the capacitance C. By discharging, a potential corresponding to the peak value
of the output of the diode 213 can be obtained as the potential difference between both ends of
the capacitor 216.
[0044]
In this case, the output of the peak detection means 132 also changes while the notification
sound is generated by the speaker 221, and the amplification factor set by the amplification
factor specifying means 114 in the amplifier 216 is changed accordingly.
[0045]
That is, even while the notification sound is generated, the ambient noise level is monitored, and
the volume of the notification sound can be changed according to the change of the surrounding
environment, and the incoming call is also responded to the sudden change of the environment.
The user can be notified of the occurrence of an alarm or alarm with certainty and comfort.
[0046]
Further, as described above, by using the notch filter 231 corresponding to the type of
notification sound, noise is generated with high accuracy in consideration of the magnitude of
noise close to the frequency of the notification sound even during the generation of the
notification sound. It is possible to measure the level.
[0047]
Note that, instead of the notch filters 2311 to 231 n shown in FIG. 5, a filter that removes all the
frequency components included in each notification sound is provided, and the selector 233
selects one of the filter and the bypass path 232. It is also good.
Also, the filter 131 may be configured using a filter that removes the distribution range of the
frequency component included in each notification sound, instead of the above-described filter.
[0048]
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Since the volume control circuit of claim 3 needs to have a filter for removing the frequency of
notification sound, it is suitable for controlling the volume of notification sound of OA equipment
and home appliances in which the frequency of notification sound is fixed.
However, if the filter 131 is configured to include a filter that removes the range in which the
frequency components of human voice are distributed, the present invention can be applied to
control of the volume such as announcements in a station yard.
[0049]
Further, the configuration of the filter 131 is not limited to that in which a pair of notch filter and
bypass path is connected in series, and when it is only necessary to remove a specific component,
a plurality of notch filters are connected in parallel. The input signal may be sent to the peak
detection means 132 in the subsequent stage via a pulse.
[0050]
As described above, according to the present invention, the noise level in the surroundings is
evaluated based on the output of the microphone for collecting the sound in the surroundings of
the sound output means, and according to the evaluation result, By changing the amplification
factor, it is possible to change the volume of notification sound in consideration of changes in the
surrounding environment, and it is possible to always make the volume suitable for the
surrounding environment, so it is more effective and more effective. Information can be
transmitted to users comfortably.
[0051]
The invention according to claim 2 reflects the environment around the output start point of the
notification voice in the volume of the notification voice by designating the amplification factor
corresponding to the ambient noise level at the input moment of the notification voice signal.
Can.
[0052]
The invention according to claim 3 monitors the change of the environment even during the
output of the notification voice by removing the frequency component of the output voice by the
voice output means using the filter, and reflects it on the volume of the notification voice. It can
be done.
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