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DESCRIPTION JP2003347869

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DESCRIPTION JP2003347869
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
volume control of an AV system comprising a signal generator and a display device with a
speaker.
[0002]
2. Description of the Related Art In a general TV receiver or audio apparatus, the volume setting
value at the time of power-off is stored in advance, and at the time of power-on, the same volume
is stored using the previously stored volume setting value. I'm playing.
[0003]
Furthermore, in Japanese Patent Application Laid-Open No. 2001-44774 "Audio reproduction
system", an audio reproduction system storing volume setting values for each input source and
using it is disclosed in Japanese Patent Application Laid-Open No. 2000-284946 "Information
processing apparatus and method and medium". Japanese Patent Laid-Open No. 2000-196970
“A receiver with a function of information terminal function and a recording medium storing an
output environment setting program of the receiver”, the operation of the user According to the
history information, it is described that the genre of the broadcast program is automatically
reproduced as a parameter at a volume that matches the user's preference.
[0004]
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However, it is premised that the apparatus in which the speaker for reproducing the audio signal
is arranged and the apparatus for supplying the audio signal to be reproduced are integrated or
the combination is not changed. For example, in the case of a system in which the control device
having the function of determining the sound volume and the reproduction device for
reproducing the audio can be separated, it has not been considered until the reproduction device
is replaced.
For example, when the system is changed to a playback apparatus equipped with a speaker with
extremely high efficiency, it may be played back at an extremely high volume when the system is
turned on, which may cause the user to hesitate.
[0005]
Also, even with the same playback device, after the installation location has been changed, due to
the new installation location and the reverberation characteristics, the system may be played
back at a large volume as the power is turned on.
[0006]
According to the present invention, in an AV system in which an audio reproduction unit in
which a speaker is arranged and a signal generation unit for supplying an audio signal can be
separated, the volume adjustment means is a signal generation unit or An audio setting unit is
provided in the audio reproduction unit, a sound volume determination unit is provided in the
signal generation unit or the audio reproduction unit, and an audio setting value storage unit
storing the sound volume setting value determined by the sound volume determination unit is
provided in both the signal generation unit and the audio reproduction unit. When the power is
turned on, the volume determining means compares the volume setting values stored in both the
audio setting value storing means, and if the stored values are different, the volume setting value
is reproduced with the smaller one, Alternatively, increase the volume gradually from a small
volume, or play it back at a mute or a sufficiently small volume and prompt the operator to
perform a volume setting operation, or an audio playback unit in which a speaker is arranged,
and a sound In an AV system that can be separated from a signal generation unit that supplies a
signal, a volume adjustment unit is provided in the signal generation unit or the audio
reproduction unit, a volume determination unit is provided in the signal generation unit or the
audio reproduction unit, An audio setting value storage means for storing the determined volume
setting value is provided in the signal generating unit or the audio reproducing unit, and a new
connection detecting means for detecting connection of the signal generating unit or the audio
reproducing unit different from the previous time is generated. Unit, or when the new connection
detection means detects a new connection when the power is turned on, the volume is gradually
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raised from a small volume, or it is reproduced with a mute or a sufficiently small volume and a
volume setting operation To prompt the operator.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a
circuit block diagram showing only a portion concerning an audio of an image display system
using the present invention, in which 100 is a signal generator. , 200 is an image display device.
101 in the signal generator 100 is a digital audio input unit, 102 is a transmitter for digital data
transfer, 103 is a digital audio data transfer output terminal, 110 is a first CPU, 111 is a first
non-volatile memory such as EE-PROM, 112 is a first control signal input / output terminal, 120
is an operation SW, 201 in the image display apparatus 200 is a digital audio data transfer input
terminal, 202 is a digital data transfer receiver, 205 is a digital signal processor (hereinafter
referred to as DSP , 206 is a D / A converter, 208 is a power amplifier, 209 is a speaker, 210 is a
second CPU, 211 is a second non-volatile memory such as EE-PROM, 212 is a second control
signal input / output terminal, is there.
Note that image data signal processing for image display and circuit blocks related to an image
such as a display element are omitted because they are not directly related to the description of
the present invention.
[0008]
Also, in FIG. 1, although only one block is shown in the audio signal processing system such as
the power amplifier 208 and the speaker 209, these are a plurality of channels collectively
represented in one, and a stereo Or the like may be other channel audio signals such as two or
more channels.
[0009]
The digital audio input unit 101 of the signal generator 100 is supplied with a digital audio
signal from an AV signal source (not shown), such as a TV tuner or a DVD input processing
circuit, and digital audio is transmitted via the digital data transfer transmitter 102. The signal is
output from the data transfer output terminal 103 and transmitted from the signal generator
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100 to the image display 200.
Then, it is input to the image display apparatus 200 from the digital audio data transfer input
terminal 201 and received by the digital data transfer receiver 202.
The digital audio data received by the digital data transfer receiver 202 is converted by the DSP
205 into data of the instructed volume level from the second CPU 210, and then converted back
to an analog signal by the D / A converter 206 and sent to the Amp 208. It is reproduced from
the speaker 209 driven. The first CPU 110 and the second CPU 210 exchange information with
each other through the control signal input / output terminals 112 and 212.
[0010]
In this system, image quality adjustment setting values such as brightness and contrast, and
audio adjustment setting values such as volume and tone control are collectively managed by the
signal generating device 100 side, and the setting values are also controlled to the signal
generating device 100 side. To memorize. However, only the volume setting value regarding the
volume is stored on the image display device 200 side.
[0011]
In the normal operation, the first CPU 100 detects the volume adjustment operation from the
operation SW 120 disposed in the signal generating device 100, and writes the volume setting
value to the first memory 111. It instructs the CPU 210 to set the volume. The CPU 210 writes
the volume setting indication value in the second memory 211 and instructs the DSP 205 on the
volume level. As described above, the volume setting value instructed by the operator is stored in
the first memory 111 and the second memory 211 in both the signal generating device 100 and
the image display device 200, respectively.
[0012]
Now, since the first memory 111 and the second memory 211 are non-volatile memories even if
the power is turned off in the state where the volume setting values are stored in both the signal
generating device 100 and the image display device 200 in this way, The volume setting value is
held.
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[0013]
Here, the start-up time when the power is turned on again will be described.
FIG. 2 shows a flowchart of a program sequence related to the volume setting at start-up
performed by the first CPU 110 at this time.
[0014]
When the power is turned on, the sound is muted to the image display apparatus 200 in step
402, and the volume setting value stored in the second memory 211 is received from the image
display apparatus 200 in step 403. Then, at step 404, the volume setting value "Level-1" stored
in the first memory 111 is compared with the volume setting value "Level-2" stored in the second
memory 211. Here, if the two values coincide with each other, at step 407, the volume level
corresponding to the volume setting value is instructed to the image display apparatus 200.
[0015]
If the volume setting "Level-1" stored in the first memory 111 and the volume setting "Level-2"
stored in the second memory 211 do not match, the previous operation is performed. It is
determined that an image display device different from time is connected. In that case, it is
unclear whether "Level-1" or "Level-2" is the optimal volume. Therefore, if the volume setting
value “Level-1” stored in the first memory 111 is smaller than the volume setting value
“Level-2” stored in the second memory 211 in step 404, That is, when the volume setting
value stored in the signal generating apparatus 100 is a smaller value, the volume setting value
"Level-1" stored in the signal generating apparatus 100 in step 405 is displayed on the image
display apparatus. The volume setting value stored in the second memory 211, that is, the
volume setting value stored in the image display device side is transmitted to the second memory
211, that is, the volume setting value "Level-1" stored in the first memory 111. The volume
setting value stored in the signal generator 100 is rewritten.
[0016]
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Conversely, when the volume setting value “Level-1” stored in the first memory 111 is larger
than the volume setting value “Level-2” stored in the second memory 211, that is, the image
display device 200. If the volume setting value stored is smaller, the value in the first memory
111 is updated to the setting value “Level-2” stored in the image display apparatus 200 in
step 406.
[0017]
As described above, when the volume setting value stored in the signal generating apparatus 100
and the volume setting value stored in the image display apparatus 200 are different, the smaller
value of the two is adopted and the larger value is selected. The volume setting value of the
stored one is updated to the smaller value, and the reproduction is started at the smaller volume.
[0018]
(Second Embodiment) FIG. 3 is a circuit block diagram showing only a portion related to speech
in a second embodiment of the image display system using the present invention, and 100 is a
signal generation as in FIG. A device 200 is an image display device.
101 in the signal generator 100 is a digital audio input unit, 102 is a transmitter for digital data
transfer, 103 is a digital audio data transfer output terminal, 110 is a first CPU, 111 is a first
non-volatile memory such as EE-PROM, 112 is a first control signal input / output terminal, 120
is an operation SW, 201 in the image display apparatus 200 is a digital audio data transfer input
terminal, 202 is a digital data transfer receiver, 206 is a D / A converter, 207 Is a variable gain
amplifier, 208 is a power amplifier, 209 is a speaker, 210 is a second CPU, 211 is a second nonvolatile memory such as EE-PROM, and 212 is a second control signal input / output terminal.
Also in FIG. 3, image data signal processing for displaying an image and circuit blocks related to
an image such as a display element are omitted because they are not directly related to the
description of the present invention.
[0019]
Now, digital audio data from the signal generator 100 is input to the image display apparatus
200 from the digital audio data transfer input terminal 201 and received by the digital data
transfer receiver 202, the volume setting instructed by the operator The values are stored in the
first memory 111 and the second memory 211 in both the signal generating device 100 and the
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image display device 200, respectively, and the CPU 110 executes a program sequence as shown
in the flowchart of FIG. The steps up to determining the volume setting value and performing
control according to the setting value are the same as in the first embodiment.
[0020]
In the second embodiment, a variable gain amplifier 207 for analog processing is provided in
place of the DSP for digital processing as a block responsible for volume adjustment.
[0021]
The variable gain amplifier 207 is an amplifier that amplifies the amplitude of the analog signal,
and the amplification factor changes under control of the CPU 210.
The CPU 210 controls the variable gain amplifier 207 to reproduce sound at a volume instructed
by the CPU 110 in the signal generation device 100, and the signal generation device 100 stores
the signal when the power is turned on or the like. When the volume setting value and the
volume setting value stored in the image display apparatus 200 are different, the smaller one of
the two is adopted, and the volume setting value of the larger one is stored as the smaller one.
Update to a value and start playback at the lower volume.
[0022]
(Third Embodiment) FIG. 4 is a circuit block diagram showing only a portion related to voice in
the third embodiment of the image display system using the present invention, and 100 is a
signal generation as in FIG. A device 200 is an image display device.
105 in the signal generator 100 is an analog voice input unit, 106 is a buffer amplifier for analog
voice signal output, 107 is an analog voice signal output terminal, 110 is a first CPU, 111 is a
first non-volatile memory such as EE-PROM. 112 is a first control signal input / output terminal,
120 is an operation SW, 207 in the image display apparatus 200 is a variable gain amplifier, 208
is a power amplifier, 209 is a speaker, 210 is a second CPU, 211 is A second non-volatile
memory such as EE-PROM, 212 is a second control signal input / output terminal, 216 is a buffer
amplifier for analog audio signal input, and 217 is an analog audio signal input terminal. Also in
FIG. 4, image data signal processing for displaying an image, and circuit blocks related to an
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image such as a display element are omitted because they are not directly related to the
description of the present invention.
[0023]
The third embodiment is an example in which the present invention is applied to a system for
transmission of analog voice signals.
[0024]
An analog audio input unit 105 in the signal generating apparatus 100 is supplied with an
analog audio signal from an AV signal source (not shown), such as a TV tuner or a DVD input
processing circuit, and the analog audio signal output buffer amplifier 106 It is output from the
audio signal output terminal 107.
[0025]
The analog audio signal output from the analog audio signal output terminal 107 of the signal
generator 100 is input from the analog audio signal input terminal 217 of the image display
device 200 and is transmitted to the variable gain amplifier 207 via the analog audio signal input
buffer amplifier 216. It is input.
The variable gain amplifier 207 is equivalent to that shown in FIG. 3 as the second embodiment,
and the amplification factor is determined by the control from the CPU 210 as in the second
embodiment, and the output thereof drives the speaker 209. The audio is input to the Amp 208
and played back.
[0026]
The control communication also operates in the same manner as in the second embodiment, and
is stored in the first memory 111 and the second memory 211 in both the signal generating
device 100 and the image display device 200 at the time of activation such as power on. Based
on the set volume setting value, the CPU 110 determines the volume setting value according to a
program sequence as shown in the flowchart of FIG. 2, and the CPU 210 performs control in
accordance with the set value.
[0027]
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In this manner, when the volume setting value stored in the signal generating apparatus 100 and
the volume setting value stored in the image display apparatus 200 are different, the smaller
value of the two is adopted, and the value is larger. The volume setting value of the one storing
the value is updated to the smaller value, and the reproduction is started at the smaller volume.
[0028]
(Fourth Embodiment) FIG. 5 is a circuit block diagram showing only a portion related to voice in
a fourth embodiment of the image display system using the present invention, and 100 is a
signal generation as in FIG. A device 200 is an image display device.
101 in the signal generator 100 is a digital voice input unit, 104 is a digital data transfer
modulator, 105 is a digital voice data transfer infrared light emitter, 110 is a first CPU, 111 is a
first non-volatile such as EE-PROM, etc. Memory 113, a first modulation / demodulation unit for
control signal, 114 an antenna for first control signal communication, 120 an operation SW, and
203 in the image display apparatus 200 is an infrared light receiver for digital voice data , 204 is
a digital voice data demodulator, 206 is a D / A converter, 208 is a power amplifier, 209 is a
speaker, 210 is a second CPU, 211 is a second non-volatile memory such as EE-PROM, 213 is a
second And a second control signal communication antenna 214.
Also in FIG. 5, image data signal processing for displaying an image and circuit blocks related to
an image such as a display element are omitted because they are not directly related to the
description of the present invention.
[0029]
In the case of the fourth embodiment, the signal generation device 100 and the image display
device 200 are wirelessly connected, and the audio signal performs communication using
infrared rays, and the control signal performs communication using weak radio waves.
[0030]
The digital audio signal input from the digital audio input unit 101 of the signal generator 100 is
subjected to pulse width modulation by the digital data transfer modulator 104 and a
transmission signal using a predetermined frequency, for example, 400 kHz as a carrier
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Modulated to
The digital sound data transfer infrared light emitter 105 is blinked by the signal obtained by
modulating the 400 kHz carrier, and an infrared communication sound signal is emitted.
The image display apparatus 200 receives this infrared communication audio signal at the
infrared receiver 203 for digital audio data, and returns it to a pulse width modulation signal
from which the carrier component of 400 kHz is removed first. Then, the pulse width modulation
signal is demodulated by the digital audio data demodulator 204 at the next stage to obtain a
digital audio signal, and the digital audio signal is supplied to the D / A converter 206. On the
other hand, the control communication between the first CPU 110 and the second CPU 210
includes the first and second control signal modulation / demodulators 113 and 213 and the first
and second control signal communication antennas 114 and 214. As in the first embodiment, bidirectional communication is performed via the first memory 111 and the second memory 211
in both the signal generator 100 and the image display 200 at the time of activation such as
power on. Based on the stored volume setting value, the CPU 110 determines the volume setting
value according to a program sequence as shown in the flowchart of FIG. 2 and instructs the CPU
210 to set the volume setting value.
[0031]
The amplitude at the time of analog conversion of the D / A converter 206 is determined by the
amplitude control voltage input from the outside, and the CPU 210 controls the reproduction
volume by this amplitude control voltage. The analog audio signal output from the D / A
converter 206 is input to the Amp 208 to drive the speaker 209.
[0032]
In this manner, when the volume setting value stored in the signal generating apparatus 100 and
the volume setting value stored in the image display apparatus 200 are different, the smaller
value of the two is adopted, and the value is larger. The volume setting value of the one storing
the value is updated to the smaller value, and the reproduction is started at the smaller volume.
[0033]
In this embodiment, an infrared signal is used for audio signal communication and a weak radio
wave is used for the control signal. However, even if both are communicated by the weak radio
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wave or other communication method, the present invention is applied. It goes without saying
that there is no change in the subject matter of the invention.
[0034]
Fifth Embodiment In the first to fourth embodiments, when the volume setting value stored in the
signal generating apparatus 100 and the volume setting value stored in the image display
apparatus 200 are different from each other, Although the smaller value was adopted, other
methods may be considered.
[0035]
For example, it is a method of gradually increasing the volume to allow time for the operator to
perform the volume adjustment operation.
[0036]
FIGS. 6 to 7 and 8 conceptually show the curve of the increase in volume, where the horizontal
axis represents the elapsed time from the start, and the vertical axis represents the volume, both
of which are stored in the signal generating device 100. This is an example in the case where the
volume setting value “Level-1” is smaller, but, conversely, even if the volume setting value
“Level-2” stored in the image display apparatus 200 is smaller. It works the same way.
[0037]
In the method of FIG. 6, first, the smaller one of the two volume setting values stored by both of
them (in the case of FIG. 6, the volume setting value stored by the signal generating apparatus
100 "Level 1 Set ").
Then, the reproduction volume is gradually increased with time, and the larger value of the two
volume setting values stored by both of them (in the case of FIG. 6, the volume setting value
stored in the image display apparatus 200 "Level Increase to -2 ").
At this time, if the operator does not do anything if the volume setting value "Level-2" is good, the
operator feels that the volume is too high while approaching the volume setting value "Level-2".
Gives time allowance so that the volume adjustment operation can be performed by the operation
SW 120.
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[0038]
Also, in the case of FIG. 7, the volume is gradually increased with time from the completely
muted state or a sufficiently small volume, and the larger one of the two volume setting values
stored by both of them (in the case of FIG. , And the sound volume setting value "Level-2" stored
in the image display apparatus 200 is reached.
[0039]
In the case of FIG. 8, the volume is gradually increased with time from the fully muted state or a
sufficiently small volume, and the smaller value of the two volume setting values stored by both
of them (in the case of FIG. 8) The volume increase is stopped up to the volume setting value
“Level-1” stored in the signal generator 100.
[0040]
(Sixth Embodiment) FIG. 9 is a circuit block diagram showing only a portion related to voice in
the sixth embodiment of the image display system using the present invention, and 100 is a
signal generation as in FIG. A device 200 is an image display device.
101 in the signal generator 100 is a digital audio input unit, 102 is a transmitter for digital data
transfer, 103 is a digital audio data transfer output terminal, 110 is a first CPU, 111 is a first
non-volatile memory such as EE-PROM, 112 is a first control signal input / output terminal, 120
is an operation SW, 201 in the image display apparatus 200 is a digital audio data transfer input
terminal, 202 is a digital data transfer receiver, 205 is a DSP, 206 is D / A converter, 208 is a
power amplifier, 209 is a speaker, 210 is a second CPU, 212 is a second control signal input /
output terminal, and 215 is a third non-volatile memory.
Also in FIG. 9, image data signal processing for displaying an image and circuit blocks related to
an image such as a display element are omitted because they are not directly related to the
description of the present invention.
[0041]
Then, digital audio data from the signal generator 100 is input from the digital audio data
transfer input terminal 201 to the image display device 200, received by the digital data transfer
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receiver 202, and set to a volume according to the control of the CPU 210 by the DSP 205. The
point that the D / A converter 206 converts the signal into an analog signal and the signal is
reproduced from the driven speaker 209 of the power amplifier 208 is the same as in the first
embodiment.
[0042]
The control communication performed between the CPU 110 and the CPU 210 is also performed
similarly to the first embodiment, but the method of determining the volume setting value is
different.
[0043]
In the first to fifth embodiments, two of the volume setting value stored in the signal generating
apparatus 100 and the volume setting value stored in the image display apparatus 200 are used,
but in the sixth embodiment Only the signal generator 100 stores the volume setting value.
[0044]
In the third memory 215 provided on the image display device 200 side, not the volume setting
value but a different ID number is written at the time of manufacture.
The CPU 110 on the signal generating device 100 side detects that it is connected to other than
the image display device previously connected by confirming the ID number recorded in the third
memory 215 in the image display device 200. Do.
[0045]
FIG. 10 is a flowchart of a program sequence related to the volume setting at start-up performed
by the CPU 110.
[0046]
As in the first embodiment, when the power is turned on, first, at step 502, the image display
apparatus 200 is made to mute the sound.
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Then, at step 503, the ID number held in the third memory 215 is received from the image
display apparatus 200, and at step 504, this ID number is compared with the ID number stored
in the first memory 111.
Here, if the two values match, the volume setting value stored in the first memory 111 is
instructed to the image display apparatus 200 in step 505.
[0047]
If the ID numbers do not match in step 504, it is determined that an image display device
different from the one used in the previous operation is connected, and in step 506, a display
prompting the operator to perform the volume setting operation is displayed. In step 507, the
new ID number is written to the first memory 111, and the startup volume setting sequence is
ended.
[0048]
FIG. 11 is an example of the “display for prompting the operator to perform the volume setting
operation” instructed to the image display apparatus 200 at step 506 at this time, and the OSD
display of the bar graph for such volume setting is shown in FIG. 9 is drawn on a display not
shown.
[0049]
In this way, when the signal generating apparatus 100 checks the ID number of the image
display apparatus 200 of the other party of connection at the time of activation such as power on
etc., the apparatus is newly connected to other than the image display apparatus previously
connected. In this case, after muting the playback volume, a display prompting the operator to
perform the volume setting operation is performed.
[0050]
Alternatively, as shown in FIG. 12, when the signal generating apparatus 100 recognizes as a
new image display apparatus at the time of start-up such as power on, the volume stored in the
first memory 111 is gradually increased from mute or a sufficiently small volume. Increase
playback volume to level.
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Then, it is conceivable to provide a time margin so that the volume adjustment operation can be
performed by the operation SW 120 during the period in which the volume increases.
[0051]
Seventh Embodiment A seventh embodiment is an example used for a wireless headphone as
shown in FIG. 13, 600 is a signal transmitter, and 700 is a headphone receiver.
FIG. 14 is a circuit block diagram showing only the main parts of the signal transmitter 600 and
the headphone receiver 700.
[0052]
In the signal transmitter 600, 601 is a digital voice input unit, 604 is a digital data transfer
modulator, 605 is a digital voice data transfer infrared light emitter, 610 is a first CPU, 611 is an
EE-PROM etc. Memory 613 is a first modulation / demodulation unit for control signal, 614 is an
antenna for first control signal communication, 620 is an operation SW, and 703 in the
headphone receiver 700 is an infrared light receiver for digital voice data , 704 is a digital voice
data demodulator, 706 is a D / A converter, 708 is a power amplifier, 709 is a speaker, 710 is a
second CPU, 713 is a second control signal modulator / demodulator, and 714 is a second The
control signal communication antenna 715 is a third non-volatile memory.
[0053]
In the case of the seventh embodiment, the signal transmitter 600 and the headphone receiver
700 are wirelessly connected, and the audio signal performs communication using infrared rays,
and the control signal performs communication using weak radio waves.
[0054]
The digital audio signal input from the digital audio input unit 601 of the signal generator 600 is
subjected to pulse width modulation by the digital data transfer modulator 604 and is a
transmission signal using a predetermined frequency, for example, 400 kHz as a carrier.
Modulated to
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The digital sound data transfer infrared light emitter 605 blinks with the signal obtained by
modulating the carrier of 400 kHz, and an infrared communication sound signal is emitted.
The headphone receiver 700 receives this infrared communication audio signal at the infrared
receiver 203 for digital audio data, and first converts it back to a pulse width modulation signal
from which the carrier of 400 kHz has been removed.
Then, the pulse width modulation signal is demodulated by the digital audio data demodulator
704 in the next stage to obtain a digital audio signal, and the digital audio signal is supplied to
the D / A converter 706.
On the other hand, control communication between the first CPU 610 and the second CPU 710
includes the first and second control signal modulation / demodulators 613 and 713 and the first
and second control signal communication antennas 614 and 714. As in the sixth embodiment,
two-way communication is performed, and the ID number of the headphone receiver 700 is
checked at start-up such as power-on, which differs from the headphone receiver previously
connected. It is detected that the new headphone receiver 700 is used, and in this case, it is
reproduced at a small volume.
[0055]
Alternatively, as shown in FIG. 15, when the signal generating apparatus 600 recognizes as a
new headphone receiver at the time of start-up such as power on, the volume stored in the first
memory 111 is gradually increased from mute or a sufficiently small volume. Increase playback
volume to level.
Then, it is conceivable to provide a time margin so that the volume adjustment operation can be
performed by the operation SW 120 during the period in which the volume increases.
[0056]
(Other Embodiments) In any of the above embodiments, the volume determination function is
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disposed on the signal generator side (signal transmitter side), and the volume control function is
disposed on the image display side (headphone receiver side). Although the examples have been
described, even if they are arranged on either side, the object and the effect of the present
invention can be exhibited, and the invention is not limited to only one of them.
Moreover, it goes without saying that any of them can correspond to a plurality of channels as
audio channels.
[0057]
In the sixth and seventh embodiments, new connections are detected by checking the ID numbers
written in the third non-volatile memories 215 and 715, but devices other than these are also
different from the prior art Any information can be substituted as long as it can be determined
that is connected.
For example, when the connection between the systems is cut off, or when either or both of the
power supplies are shut off, the date and time are stored by both parties of the system, and the
date and time when the next power supply is turned on or connected. It may be a method such as
matching.
[0058]
As described above, in the AV system in which the audio reproduction unit in which the speakers
are arranged and the signal generation unit for supplying the audio signal can be separated, the
volume adjustment means may be a signal generation unit or an audio reproduction. The audio
setting value storage means is provided in the unit and the sound volume setting means is
provided in the signal generation unit or the audio reproduction unit, and the sound setting value
storage means is provided in both the signal generation unit and the audio reproduction unit The
means compares the volume setting values stored in the two audio setting value storage means
when the power is turned on, and if the values stored in the two are different, playback is
performed with the smaller volume setting value or smaller The volume is gradually raised from
the volume, played back with mute or a sufficiently small volume and prompting the operator for
volume setting operation, or an audio reproduction unit in which a speaker is arranged, and an
audio signal In an AV system that can be separated from a signal generation unit to be supplied,
a volume adjustment unit is provided in the signal generation unit or the audio reproduction unit,
a volume determination unit is provided in the signal generation unit or the audio reproduction
unit, and the volume determination unit The voice generation value storage means for storing the
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volume setting value is provided in the signal generation unit or the voice reproduction unit, and
the new connection detection means for sensing that the signal generation unit or the voice
reproduction unit different from the previous time is connected is the signal generation unit or
The audio playback unit is equipped, and when the new connection detection means detects a
new connection when the power is turned on, the volume is gradually raised from a small
volume, or the volume setting operation is operated while playing back with mute or a
sufficiently small volume. By prompting the user to change the connection combination such as
when the audio reproduction unit is changed to an audio reproduction unit equipped with a
speaker with extremely high efficiency, or change the installation location If there is, it can be
prevented or reproduced by an extremely large volume with system power-up.
10-04-2019
18
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