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DESCRIPTION JP2008228184

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DESCRIPTION JP2008228184
The present invention is capable of determining a surrounding noise level according to a time
zone, adjusting the volume appropriately based on this, and automatically switching the output
path (speaker, headphones, etc.) depending on the noise level. Provide an output device.
SOLUTION: By using an appropriate noise judgment value in accordance with a time zone, it is
possible to properly judge the current noise level and appropriately adjust the sound volume, and
switch the audio output path according to the noise level. did. [Selected figure] Figure 3
Voice output device
[0001]
The present invention relates to an audio output device such as a television receiver and a CD
player, and more particularly to a technology capable of outputting audio from a wireless
headphone and capable of automatically adjusting the volume according to the surrounding
environment.
[0002]
Conventionally, in audio output devices such as television receivers and CD players, there are
technologies described in, for example, Patent Documents 1 and 2 as techniques for
automatically adjusting the output sound volume at the time of outputting sound from a speaker.
[0003]
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1
The technology described in Patent Document 1 automatically performs volume adjustment
control with respect to fluctuations in signal level on the broadcast side, such as CM.
Specifically, the output volume from the speaker of an audio output device such as a television
receiver is measured, and the measured volume value is compared with the reference volume
value, and the difference between them exceeds a preset threshold value. The output volume is
automatically increased or decreased.
[0004]
Further, according to the above-described automatic volume adjustment method, when the noise
around the viewer increases, the measured volume value increases, and there is a possibility that
a malfunction may occur to automatically reduce the volume. Based on the position information
of the sound source that can be identified by the microphone (sound collection means) and the
frequency characteristic, the output sound from the speaker and the noise are distinguished to
avoid the malfunction.
[0005]
Furthermore, a technique is disclosed for automatically adjusting the volume in consideration of
surrounding noise (for example, if the noise level is higher than a reference value, the volume is
raised within the maximum volume, etc.).
Furthermore, it is disclosed that various setting values and reference values regarding volume
adjustment are corrected based on an accumulated average at fixed time intervals (for example,
one minute, five minutes, etc.).
[0006]
Further, the technique described in Patent Document 2 is to output the sound volume of the
speaker in accordance with the steady noise level around the device.
Specifically, a microphone for noise detection is attached to the speaker, transient noise is
removed, a noise level around the speaker is detected, and the speaker volume is automatically
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2
adjusted according to the detected steady noise level. This makes it possible to always deliver an
ideal speaker volume.
[0007]
In addition, "noise level (dB)" shall mean the thing of the evaluation scale which corrected the
sound pressure level (dB) showing the magnitude | size of a sound according to human hearing.
JP, 2003-304590, A JP, 11-261355, A
[0008]
As described above, the techniques described in Patent Documents 1 and 2 automatically adjust
the speaker volume according to the surrounding noise level, for example, automatically increase
the speaker volume when the surrounding noise level is high. It is a thing.
[0009]
However, in the above Patent Documents 1 and 2, the volume is adjusted according to the simple
noise level (a value obtained by simply correcting the sound pressure level) of the surroundings
regardless of the viewing time zone, so the same volume can be used in daytime and nighttime
Since the adjustment is performed, it can not be said that the appropriate volume adjustment can
be performed.
That is, since noise is a sensory quantity based on human hearing, the level felt as noise should
be different between relatively noisy daytime and relatively quiet nighttime, and the volume
control should be performed in consideration of this. In addition, even if the noise level is the
same, if the volume control is performed at night as well as at daytime, the noise level at night
(reference value of noise level) will be exceeded, and noise to the neighborhood There is also a
possibility that it will become.
[0010]
The present invention is an apparatus having an audio output function such as a television
receiver or a CD player, which determines the noise level in the vicinity according to the time
zone, and can adjust the volume appropriately based on this. An object of the present invention is
to provide an audio output device capable of automatically switching an output path (speaker,
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3
headphones, etc.) depending on a noise level.
[0011]
In order to achieve the above object, the present invention provides an audio output including a
speaker and a volume adjustment unit capable of adjusting the volume of sound output from the
speaker (adjustable output level of an audio signal input to the speaker). In the device, sound
from the surroundings including the sound from the speaker is input, and sound collecting
means for outputting a sound signal based on the input sound, clock means capable of managing
the current time, and the sound collecting means And noise determination value generation
means for generating a noise determination value according to a time zone based on the noise
level, the volume adjustment means comprising The volume of the sound output from the
speaker is adjusted based on the noise determination value.
[0012]
That is, by using an appropriate value according to the time zone as a noise determination value
for determining how much the sound signal (voice from the speaker and ambient noise) input
from the sound collection means is noise. The current noise level was properly determined, and
the volume was adjusted appropriately.
[0013]
Specifically, when the current time acquired from the clock means is in a first time zone (for
example, nighttime), the noise judgment value generation means calculates the noise level
calculation means within a predetermined time. The average value of the noise levels is taken as
the noise determination value, and when the current time obtained from the clock means is in the
second time zone (for example, daytime), the noise level calculation means calculates the noise
level within a predetermined time. The maximum noise level was used as the noise judgment
value.
[0014]
For example, since it is considered that the ambient noise is small at night, it can be judged that
the impact noise is a noise level significantly higher than the noise levels before and after it.
Therefore, if the volume is adjusted (for example, increased) according to the noise level based on
the impact noise, it can be easily predicted that the volume will be too high, so the average value
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of the noise levels calculated within a predetermined time period By setting the noise judgment
value, the impact noise was made to be minor.
[0015]
On the other hand, in the daytime, it is considered that the surrounding noise is large, so it can
be judged that even if there is an impact noise, it is not a noise level extremely distant from the
noise levels before and after it.
Therefore, it is considered that the maximum value of the noise level calculated within a
predetermined time including this impact noise may be regarded as the noise determination
value, thereby reducing the burden on the calculation process of the noise determination value,
which is useless. It can be expected to reduce power consumption and save energy.
[0016]
The sound processing apparatus further comprises a first comparison means for comparing the
noise judgment value at the current time with the noise judgment value before a predetermined
time, wherein the volume adjustment means determines that the noise judgment value at the
current time is predetermined by the first comparison means. When it is determined that the
noise level is smaller than the previous noise determination value, the volume is adjusted to
decrease, and when it is determined to be larger than the noise determination value before the
predetermined time, the volume is adjusted to increase.
[0017]
When the noise determination value does not change, the volume may not be changed.
Further, the volume may be adjusted when the change of the noise determination value becomes
equal to or more than a preset threshold value.
[0018]
Further, noise reference value setting means capable of setting noise level reference values (first
reference value, second reference value) corresponding to the first time zone and the second time
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zone, and at the current time And a second comparison means for comparing the noise judgment
value with the noise reference value set in the noise reference value setting means, wherein the
volume adjustment means is based on the comparison result by the second comparison means.
The volume of the sound output from the speaker is adjusted.
[0019]
As a result, it is possible to set a reference value for determining noise according to the time
zone, and to accurately determine the current level of noise (whether it is noise as a whole).
[0020]
Further, the sound volume adjusting means does not change the sound volume of the sound
outputted from the speaker when it is judged by the second comparing means that the noise
judgment value is larger than the noise reference value.
[0021]
In other words, if the surrounding sound including the sound from the speaker is determined to
be noise as a whole, increasing the volume from the speaker is likely to be perceived as noise
with respect to the neighborhood, and the sound volume is further increased. Since I can not
expect the voice to be easy to hear even if I let it go, I tried not to increase the volume.
[0022]
When it is determined by the second comparison means that the noise determination value is
smaller than the noise reference value (that is, when it is not judged as noise as a whole), the
volume adjustment is performed based on the comparison result by the first comparison means.
It should be done.
[0023]
The apparatus further comprises an output path setting unit configured to be able to output an
audio signal to a headphone and setting which one of the speaker and the headphone to output
an audio signal, and the output path setting unit includes the second comparison unit. When it is
determined that the noise determination value is greater than the noise reference value, an audio
signal is output to the headphones.
[0024]
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In other words, if it is highly probable that noise will be heard from the neighborhood, and it can
not be expected that the sound will be easier to hear even if the volume is increased further, the
audio output path is automatically changed to headphones and the best. To provide users with a
form of listening to
In this case, it is desirable to prompt the user to use the headphone by displaying a message such
as "changed to headphone output".
[0025]
Furthermore, the audio signal transmitting means capable of transmitting an audio signal to the
wireless headphone by wireless communication is provided.
In this way, the user can easily enjoy the listening form by the wireless headphones even when
switched to the headphone output by keeping the wireless headphones at hand (the headphone
cord does not have to be connected to the audio output device). Wireless headphones can be
used effectively.
[0026]
According to the present invention, since the appropriate noise determination value is used
according to the time zone, it is possible to accurately determine the current noise level and
perform appropriate volume adjustment.
[0027]
Also, when it is determined that the noise determination value is larger than the noise reference
value (that is, when it is determined to be noise as a whole), an audio signal is output to the
headphones (in particular, the wireless headphones). The user can easily take the best listening
form even when it can not be expected that the sound will be easy to hear even if the volume is
further increased.
Furthermore, it is possible to prevent the noise pollution to the neighborhood by increasing the
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volume too much.
[0028]
Hereinafter, embodiments of the present invention will be described based on the drawings.
FIG. 1 is a block diagram showing an overall configuration of a television receiver 100 which is
an example of an audio output device according to the present invention.
[0029]
The television receiver 100 according to the present embodiment includes an antenna 11, a
digital broadcast receiver (tuner) 12, a signal processing circuit 13, a decoder 14, a display panel
15, a volume adjuster 16, a speaker 17, and the like. A wireless voice output unit 18, a time
management timer 19, an input unit 20, a control unit 21, a volume sensor 22, a memory 23,
and an external input terminal 24 are configured.
[0030]
Specifically, the digital broadcast receiver 12 selectively receives a television broadcast signal
(for example, terrestrial digital broadcast, BS digital broadcast, CS digital broadcast) via the
antenna 11.
[0031]
The signal processing circuit 13 demodulates the digital broadcast signal received by the digital
broadcast receiving unit 12 or a digital signal input from an external device (for example, a DVD
player) via the external input terminal 24.
The demodulated video data is supplied to the video decoding unit 141, and the audio data is
supplied to the audio decoding unit 142.
Further, time information included in the digital broadcast signal is supplied to a time
management timer 19.
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[0032]
The video decoding unit 141 decodes the video data supplied from the signal processing circuit
13 to generate a video signal, and the decoded video signal is output to the display panel 15 such
as an LCD.
The audio decoding unit 142 decodes the audio data supplied from the signal processing circuit
13 to generate an audio signal, and the decoded audio signal is output to the volume adjustment
unit 16.
[0033]
The volume adjustment unit 16 adjusts the output level of the audio signal output to the speaker
15, and adjusts the volume of the audio output from the speaker 15.
[0034]
The wireless audio output unit 18 digitally modulates the audio signal output from the volume
adjustment unit 16, for example, and transmits the modulated signal to the wireless headphones
by wireless communication (for example, wireless LAN).
For example, the wireless communication unit 18 is configured to include an A / D conversion
unit (not shown), a codec (encoder), a BB / MAC processing unit, an RF unit, and an antenna.
[0035]
In the wireless voice output unit 18, the analog signal input from the volume adjustment unit 16
is converted into a digital signal in the A / D conversion unit, and is encoded in the codec.
Next, in the BB / MAC processing unit, processing concerning the physical connection /
transmission system of the network, protocol processing concerning transmission control such as
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frame transmission / reception method and frame format, and digital modulation processing are
applied to the digital signal. .
Then, in the RF unit, an RF signal is transmitted to the wireless headphones via the antenna.
The wireless voice output unit 18 is provided with a dedicated control unit, whereby each block
of the wireless voice output unit 18 is controlled.
[0036]
The time management timer 19 is clock means capable of managing the current time, and
supplies the current time information to the control unit 21.
For example, the current time is corrected and managed based on time information included in
the digital broadcast signal.
[0037]
The input unit 20 is, for example, a remote control device provided with a plurality of operation
buttons or an operation panel provided in the main body, and channel change and volume
adjustment are performed based on an input signal from the input unit 20.
[0038]
The sound volume sensor 22 receives audio from the periphery including the audio from the
speaker 17 and outputs an audio signal based on the input audio to the control unit 21 (sound
collection means, sound collection microphone).
Based on the sound pressure level of the audio signal from the volume sensor 22, a noise level to
be described later is calculated.
[0039]
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10
For example, the noise reference value is stored in the memory 23 in correspondence with the
first time zone and the second time zone, and the noise reference value is set for each area type
(noise reference value setting means ). As described above, since the noise reference value for
judging noise is set according to the time zone, it is possible to accurately judge the current level
of noise (whether or not it is noise as a whole).
[0040]
FIG. 4 is an example of the noise reference value stored in the memory 23. As shown in FIG. 4, in
the present embodiment, 23:00 to 5:00 is referred to as a first time zone (nighttime), 6:00 to 22
with reference to environmental standards for noise based on the provisions of the Basic
Environment Act. : 00 is set as the second time zone (daytime). In addition, three categories of
“AA”, “A and B”, and “C” are provided as regional types.
[0041]
In FIG. 4, the noise reference value is set to be smaller in the first time zone (nighttime) than in
the second time zone (daytime) for any time zone. This means that relatively quiet nighttime
sounds less loud and noisy than relatively noisy daytime.
[0042]
A noise reference value for determining the degree of noise is determined based on the use area
(any category of area type) set by the user and the current time from the time management timer
19. Become. For example, if the usage area is "AA" and the current time is 19:00 (night), the noise
reference value is 40 dB.
[0043]
In addition, in the area type, areas that require especially quietness, such as medical treatment
facilities and social welfare facilities, etc. are collectively set up as “AA”, areas that are
exclusively used for housing as “A”, mainly for housing. The area to be provided is "B", and the
area to be provided for commerce, industry, etc. along with a considerable number of dwellings is
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"C".
[0044]
The control unit 21 executes, for example, a control program stored in the ROM based on an
input signal from the input unit 20 to drive and control each block of the television receiver 100.
[0045]
In the present embodiment, the control unit 21 calculates the noise level based on the sound
pressure level of the audio signal from the sound volume sensor 22 (noise level calculation
means).
Furthermore, based on the noise level, a noise judgment value corresponding to the time zone is
generated (noise judgment value generation means).
From this noise determination value, it is possible to grasp changes in noise compared with the
previous one, and to determine whether the sound from the volume sensor 22 is noise or not.
[0046]
When the noise determination value is calculated in the first time zone (nighttime), for example,
an average value of noise levels sampled in one minute is used as the noise determination value.
On the other hand, when the noise determination value is calculated in the second time zone
(daytime), for example, the maximum value of the noise level sampled in one minute is used as
the noise determination value.
[0047]
Furthermore, the control unit 21 compares the noise determination value at the current time
with the noise determination value before the predetermined time (first comparison means), and
the noise determination value at the current time and the noise reference value stored in the
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memory 23 Are compared (second comparison means). The volume adjustment unit 16 is
controlled based on the comparison result by the first and second comparison means, and the
volume of the sound output from the speaker 17 is adjusted.
[0048]
Furthermore, the control unit 21 functions as an output path setting unit that sets which one of
the speaker 17 and the wireless headphone is to output an audio signal. For example, when the
audio signal from the volume sensor 22 is too large, that is, when the noise determination value
is recognized as noise larger than the noise reference value, the wireless audio output unit 18 is
controlled to output audio from the wireless headphones. .
[0049]
The television receiver 100 according to the present embodiment has the above-described
configuration, and an appropriate value corresponding to the time zone is used as the noise
determination value, and based on the noise determination value (average value or maximum
value) Adjust the volume of the audio to be output or switch the audio output path.
[0050]
Next, automatic volume adjustment processing and output path switching processing performed
based on the control signal from the control unit 21 will be described.
FIG. 2 is a flowchart showing an initial setting process for performing automatic volume
adjustment.
[0051]
In FIG. 2, first, in step S101, the user is made to input regional information corresponding to the
surrounding environment. As regional information, there are three divisions "AA", "A and B", and
"C" shown in FIG. For example, one of three divisions is selected using a predetermined operation
button of the input unit 20.
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[0052]
Next, in step S102, a noise reference value is set. At this time, the noise reference value (first
reference value) corresponding to the first time zone (nighttime) and the noise reference value
(second reference value) corresponding to the second time zone (daytime) are set. It will be done.
For example, in the case where “AA” is set as the area information in step S101, the first
reference value is 40 dB and the second reference value is 50 dB.
[0053]
Next, in step S103, the user is allowed to set an allowable maximum output volume. That is, in
the automatic volume adjustment process, since the volume is automatically adjusted based on
the noise determination value, the user is allowed to set the maximum output volume in advance.
As a result, by automatically adjusting the volume, it is possible to prevent the volume from
increasing too much and giving the user a sense of discomfort.
[0054]
After the above steps S101 to S103, the initial setting process for performing the automatic
volume adjustment is completed.
[0055]
FIG. 3 is a flowchart showing automatic volume adjustment processing and output path switching
processing executed by the control unit 21.
[0056]
In FIG. 3, first, in step S201, based on the audio signal from the volume sensor 22, the
surrounding sound pressure level (dB) is obtained (sampled) for a predetermined time, and the
noise level is calculated based on this sound pressure level. (Noise level calculation means).
As a predetermined time, for example, the sound pressure level of the surrounding sound is
sampled for one minute to calculate the noise level.
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[0057]
Next, in step S202, it is determined whether a digital broadcast signal is being received. If it is
being received, current time information is acquired from the digital broadcast signal (step
S203).
When it is determined that the digital broadcast signal is not being received (for example, when
video and audio signals are being output from an external device such as a DVD player), the
current time information is acquired from the time management timer 19 (Step S204). As
described above, when the digital broadcast signal is received, the current time information is
acquired from the digital broadcast signal, so the time zone of the current time can be
determined based on the accurate time information.
[0058]
Next, in step S205, it is determined based on the time information acquired in step S203 or step
S204 whether the current time is night (first time zone). And when it determines with the present
time being nighttime, it transfers to step S206, and when it determines with the present time
being daytime, it transfers to step S212.
[0059]
In step S206, the average value of the noise level calculated within the predetermined time in
step S201 is calculated, and this is used as a noise determination value (noise determination
value generation means). Based on the noise judgment value, the current noise level is relatively
evaluated to adjust the sound volume. That is, since it is considered that the ambient noise is
small at night, it is possible to determine that the impact noise generated when dropping an
object is a noise level significantly higher than the noise levels before and after that. Therefore,
when the volume is adjusted (for example, increased) in accordance with the noise level based on
the impact noise, it can be easily predicted that the volume will be too high. By doing this, the
impact of impact noise is reduced.
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[0060]
Next, in step S207, the average value of the noise levels at the current time (the average value of
the noise levels calculated in step S206) is compared with the average value of the noise levels
30 minutes ago, and the noise is larger than 30 minutes ago. It is determined whether it has
become (first comparison means). In addition, when there is no average value of the noise level
30 minutes before, for example, the noise level may be obtained in advance when the power is
turned on, and may be compared using this as an initial value.
[0061]
When it is determined in step S207 that the average value of the noise levels at the current time
is larger, the process proceeds to step S208. As described above, when the average value of the
noise level at the current time is larger than the average value of the noise level 30 minutes ago,
it can be expected that the sound from the speaker 17 will be difficult to hear due to the
surrounding noise. Volume adjustment is performed in the direction of increasing the volume.
[0062]
In step S208, the average value of the noise level at the current time is compared with the first
reference value to determine whether the noise level at the current time is acceptable as noise
(second comparison means). Then, when it is determined that the average value of the noise level
at the current time is larger, sound is output from the wireless headphone (step S209, output
path setting means). In this case, it is desirable to prompt the viewer to use the headphone by
displaying a message such as "changed to headphone output".
[0063]
That is, although the sound volume adjustment should be performed in the direction to increase
the sound volume, it can be determined that the surrounding sound including the sound from the
speaker 17 as a whole becomes a noise, so if the sound volume from the speaker 17 is further
increased In addition, the sound volume is not likely to be audible even if the sound volume is
increased further, so the sound volume is not increased. In addition, by outputting sound from
the wireless headphones, the user is provided with the best listening form.
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[0064]
If it is determined in step S208 that the average value of noise levels at the current time is equal
to or less than the first reference value, the maximum output volume set in step S103 of FIG. The
volume is increased without exceeding the level (step S216).
[0065]
If it is determined in step S207 that the average value of the noise levels at the current time is
equal to or less than the average value of the noise levels 30 minutes ago, the process proceeds
to step S211, and the volume is adjusted according to the average value of the noise levels.
For example, when the average value of the noise level is smaller than the average value of the
noise level 30 minutes before, since the disturbance due to the surrounding noise is reduced, the
volume adjustment is usually performed in the direction of decreasing the volume. Also, when
there is no change in the noise determination value (average value of the noise level), the volume
is not changed.
[0066]
On the other hand, when it is determined in step S206 that the current time is daytime, the
process proceeds to step S212, the maximum value of the noise level calculated within the
predetermined time is acquired in step S201, and this is used as the noise determination value.
(Noise judgment value generation means). Based on the noise judgment value, the current noise
level is relatively evaluated to adjust the sound volume. That is, since it is considered that the
ambient noise is large in the daytime, it can be determined that even if there is an impact noise, it
is not a noise level extremely distant from the noise levels before and after it. Therefore, the
maximum value of the noise level within a predetermined time can be used as the noise
determination value, including this impact noise, thereby reducing the burden of calculating the
noise determination value, reducing unnecessary power, and saving energy. Can be expected.
[0067]
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17
Next, in step S213, the maximum value of the noise level at the current time (average value of the
noise level calculated in step S212) is compared with the maximum value of the noise level 30
minutes ago, and the noise is larger than 30 minutes ago. It is determined whether it has become
(first comparison means). In addition, when there is no average value of the noise level 30
minutes before, for example, the noise level may be obtained in advance when the power is
turned on, and may be compared using this as an initial value.
[0068]
When it is determined in step S213 that the maximum value of the noise level at the current time
is larger, the process proceeds to step S214. As described above, when the maximum value of the
noise level at the current time is larger than the maximum value of the noise level 30 minutes
before, it can be expected that the sound from the speaker 17 will be difficult to hear due to the
surrounding noise. Volume adjustment is performed in the direction of increasing the volume.
[0069]
In step S214, the maximum value of the noise level at the current time is compared with the
second reference value to determine whether the noise level at the current time is acceptable as
noise (second comparison means). When it is determined that the maximum value of the noise
level at the current time is larger, the volume is not changed (step S215).
[0070]
That is, although the sound volume adjustment should be performed in the direction to increase
the sound volume, it can be determined that the surrounding sound including the sound from the
speaker 17 as a whole becomes a noise, so if the sound volume from the speaker 17 is further
increased In addition, the sound volume is not likely to be audible even if the sound volume is
increased further, so the sound volume is not increased.
[0071]
In step S215, as in step S209, sound may be output from the wireless headphones.
[0072]
If it is determined in step S214 that the maximum noise level at the current time is less than or
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equal to the second reference value, the maximum output volume set in step S103 of FIG. 2 is
exceeded. The volume is increased in the absence range (step S216).
[0073]
If it is determined in step S213 that the maximum value of the noise level at the current time is
equal to or less than the maximum value of the noise level 30 minutes ago, the process proceeds
to step S217, and the volume is adjusted according to the maximum value of the noise level.
For example, when the maximum value of the noise level is smaller than the maximum value of
the noise level 30 minutes ago, the disturbance due to the surrounding noise is reduced, so the
volume adjustment is usually performed in the direction of decreasing the volume.
Also, when there is no change in the noise judgment value (maximum noise level), the volume is
not changed.
[0074]
After the volume adjustment or the change of the output path is performed in steps S209, S210,
S215, and S216, it is determined whether 30 minutes have elapsed in step S218, and the process
described above is performed again after 30 minutes.
[0075]
That is, although automatic volume adjustment processing can be performed at all times, there is
a problem that the load on the control unit 21 becomes too large.
In addition, there is also an advantage that it becomes easy to hear the sound by automatic
volume adjustment, but there is also a possibility that the viewer may feel uncomfortable that the
volume is adjusted frequently.
[0076]
Therefore, in the present embodiment, by performing the volume adjustment at an interval of 30
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minutes, which is one break for a broadcast program, the volume is not changed during viewing
of the same program, and power consumption increases with automatic volume adjustment. It is
kept to a minimum.
[0077]
As described above, according to the television receiver 100 of the present embodiment, what
noise is the sound signal (sound from the speaker and ambient noise) input from the volume
sensor 22 as the sound collection means As the noise judgment value for judging the above, an
appropriate value is used according to the time zone, it is possible to properly judge the current
noise level and to adjust the sound volume appropriately.
[0078]
Also, when it is determined that the noise determination value is larger than the noise reference
value (that is, when it is determined to be noise as a whole), an audio signal is output to the
headphones (in particular, the wireless headphones). The user can easily take the best listening
form even when it can not be expected that the sound will be easy to hear even if the volume is
further increased.
Furthermore, it is possible to prevent the noise pollution to the neighborhood by increasing the
volume too much.
[0079]
Furthermore, since the television receiver 100 of the present embodiment includes the audio
signal transmitting means capable of transmitting the audio signal to the wireless headphones,
the user can easily switch to the headphone output if the wireless headphones are at hand. The
user can easily enjoy the wireless headphone listening form (there is no need to connect the
headphone cord to the audio output device), and the wireless headphones can be used effectively.
[0080]
As mentioned above, although the invention made by the present inventor was concretely
explained based on an embodiment, the present invention is not limited to the above-mentioned
embodiment, and can be changed in the range which does not deviate from the gist.
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20
[0081]
For example, in step S207 and step S213 of FIG. 3, suitable volume adjustment is performed on
the basis of the magnitude of the noise determination value at the current time and the noise
determination value 30 minutes ago. The sound volume may be adjusted when the difference
between the noise determination value at time and the noise determination value 30 minutes
before becomes equal to or greater than a preset threshold.
[0082]
In addition, the interval for performing volume adjustment is not limited to 30 minutes, for
example, the user may be able to set the interval for performing volume adjustment, or the
interval for performing volume adjustment is changed according to the viewing time zone. May
be
[0083]
Also, the setting value of the noise reference value is not limited to that set in FIG. 4 and may be
set by the user, or even if the number of time zone divisions or the number of area type divisions
is increased or decreased. I do not care.
[0084]
FIG. 1 is a block diagram showing an overall configuration of a television receiver 100 according
to an embodiment of the present invention.
It is a flowchart shown about initial setting processing.
It is the flowchart shown about automatic sound volume adjustment processing and output path
switching processing.
It is one structural example of the noise reference value stored in the memory 21.
Explanation of sign
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21
[0085]
Reference Signs List 11 antenna 12 digital broadcast receiving unit (tuner) 13 signal processing
circuit 14 decoding unit 141 video decoding unit 142 audio decoding unit 15 display panel
(LCD) 16 volume adjusting unit (volume adjusting unit) 17 speaker 18 wireless audio output unit
(audio signal Transmission means 19 Time management timer (clock means) 20 Input part 21
Control part (noise level calculation means, noise judgment value generation means, comparison
means, output path setting means) 22 Volume sensor (sound collection microphone, sound
collection means) 23 Memory (noise reference value setting means) 24 external input terminal
100 television receiver
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22
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