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JP2007174687

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007174687
The present invention provides an apparatus having an audio channel of 5.1 to 7.1 channels,
which can know an actual speaker connection and facilitate optimum multi-channel
reproduction. In an audio amplifier, for example, impedance of a terminal is measured to know
an actual speaker arrangement. Warn if there is a misconnection. This information is conveyed to
the signal source by the EDID signal, and the signal of the optimum number of channels is sent.
The EDID signal is also used for connection with the video display unit, and the speaker
connection inherent to it is known. The speaker of the video display unit is used as the channel of
the front speaker to facilitate, for example, sound reproduction in 7.1 channel. [Selected figure]
Figure 1
Audio processing apparatus, audio processing system, audio output apparatus and video display
apparatus
[0001]
The present invention relates to a technique for satisfactorily reproducing audio signals of a
plurality of channels (for example, 5.1, 7.1 channels) obtained from a storage device such as
television broadcast or VTR, DVD (Digital Versatile Disc), hard disk recorder or the like. .
[0002]
In packaged media such as television broadcasting and movie software, digitization of video and
audio signals is in progress.
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1
Digital audio signals are becoming multi-channel, and for example, for DVD audio, there are 5
channels: front left (FL), front right (FR), center (C), back left (RL), back right (RR), There is one
that can reproduce a so-called 5.1-channel sound combining subwoofers (S) for bass
reproduction. In addition, there are also devices that reproduce 7.1-channel audio including front
slightly left (FLC) and front slightly right (FRC).
[0003]
As described above, when the number of channels of the audio signal is increased, the connection
of the speaker cable becomes complicated, and there is a possibility of erroneous connection. As
a first prior art for simplifying the connection work of many speakers, for example, the one
described in Patent Document 1 is known. In this document, when connecting a 5.1 channel
speaker, the arrangement of the speaker is determined by a test signal output from the speaker,
and when there is an inappropriate arrangement or connection, notification is made with the
speaker. Switching the connection with an audio amplifier is disclosed.
[0004]
As a second prior art, for example, the one described in Patent Document 2 is known. This
document describes detecting a terminal not connected to a speaker and distributing an audio
signal to be supplied to the speaker to another speaker.
[0005]
JP, 2001-25085, A JP, 10-94086, A
[0006]
However, the first prior art does not suggest a method of automatically responding only to a
warning display when a part of the speakers is not connected to the audio signal processing
apparatus.
For example, even if a switcher device with an audio amplifier, which is one of the audio signal
09-05-2019
2
processing devices, supports 5.1 channels, if the user does not perform appropriate processing,
the sound effect may be unsatisfactory.
[0007]
The second prior art performs processing automatically, and there is no need to give instructions
for manual audio processing. However, according to the second prior art, distribution processing
of audio signals is performed only in the audio amplifier. Therefore, for example, even when the
audio signal source connected to the audio amplifier can not know the number of speakers
connected to the audio amplifier and can supply a plurality of audio signals such as stereo and
5.1 channels, it is appropriate. Can not provide a good audio signal.
[0008]
In the first and second prior arts, the video display unit of the video display device can be
effectively used when the speaker originally provided in the video display device such as a
television receiver is also effectively used or connected. It was not considered about using or.
[0009]
The present invention has been made in view of the above problems.
An object of the present invention is to provide a technique for transmitting to a voice signal
source the connection state of a speaker connected to a voice processing device, requesting
suitable voice data, and preferably performing voice reproduction. It is to do. Further, the present
invention provides a technology capable of performing more excellent audio reproduction by
effectively utilizing a speaker provided in a video display device. Furthermore, the present
invention provides a technology that makes it possible to easily confirm complicated multichannel speaker connections by using the display unit of the video display device.
[0010]
In order to achieve the above object, the present invention relates to an audio signal processing
apparatus such as a switcher apparatus, a detection circuit for detecting a connection state of a
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speaker to each output terminal of audio signals corresponding to a plurality of audio channels,
and the detection circuit And a control circuit for transmitting information relating to the
connection state of the speaker to an audio signal output device such as an STB based on the
detection result of the above. The configuration of the audio processing device may be provided
in a video display device such as a television receiver.
[0011]
The audio signal output device inputs information on the connection state of the speaker, and
controls the number of audio channels to be supplied to the audio processing device based on
the input information.
[0012]
Specifically, in the audio processing device, the detection circuit connects speakers of a specific
channel (for example, a front right (FR) channel and a front left (FL) channel and / or a center (C)
channel) to the output terminal. If it is not detected, the audio signal of the specific channel is
superimposed on the video signal, and the audio signal of the specific channel is reproduced by
the speaker attached to the video display device. Good.
[0013]
Also, when connecting a speaker, an OSD (On Screen Display) circuit is provided, and this OSD
circuit provides a user with a visual message regarding the connection state of the speaker using
the detection result by the detection circuit. It is preferable to
This message may include, for example, information indicating the presence or absence of a
connection error of a speaker or a connection of a speaker.
In addition, the arrangement of the speakers may be displayed by the OSD circuit, and a display
may be made to visually determine the speaker under test when giving a test voice signal to each
speaker.
[0014]
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According to the present invention, it is possible to preferably reproduce multi-channel audio
signals according to the connection state of the speakers. Further, in addition to the speakers
connected to the switcher etc., it is possible to use the speakers of the video display device
together, and a higher acoustic effect can be obtained. In addition, since the connection state of
the speakers is displayed on the video display device, there is an effect that the connection of the
speakers can be performed easily and reliably.
[0015]
The present invention is a broadcast receiving apparatus (hereinafter referred to as STB (set-topbox)) which receives television broadcasting and outputs an audio signal and a video signal, an
audio signal output apparatus such as a VTR and a DVD (of course, a video signal Can also be
output), an audio processing apparatus such as a switcher for processing a signal from the audio
signal output apparatus and distributing it to a plurality of speakers, or a video display apparatus
such as a television receiver.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a device block diagram showing an embodiment of the present invention. The device of
the present embodiment includes a video display device 1, an audio reproduction device 2 and a
signal source 3. The video display device 1 and the audio reproduction device 2 are connected to
each other by a video and audio signal transmission line 231 including a plug and play function.
About this transmission line, DVI 1.0 (Digital Visual Interface version 1.0) of DDWG (Digital
Display Working Group) establishment which is a connection standard of the main part of PC
(Personal Computer) and a display device, and an independent voice transmission line were used
together. An interface may be used. Also, an interface for superimposing and transmitting a
digital video signal and a digital audio signal may be used.
[0017]
In the following description of the present embodiment, the “plug and play function” means
that when the signal transmission unit and the signal reception unit are connected by cable, the
characteristic data of the signal reception unit is signaled without human intervention. It refers to
the function of the transmission unit to recognize and automatically transmit the optimum signal
to the signal reception unit.
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[0018]
The embodiment of the present invention is devised to notify the video / audio signal source of a
speaker that can actually function.
Furthermore, when the state of the speaker connection is changed, the video / audio signal
source can know this, and the device is made so as to obtain an audio output suitable for the new
state even during operation.
[0019]
First, at each of the terminals to which the speaker cables 220 to 225 are connected, the
switcher 201 measures the impedance of the load and detects the presence or absence of the
speaker connection. If it is only the presence or absence, the measurement does not need to be
so precise, but a signal source having an output impedance may be provided to roughly measure
the voltage appearing at the terminal. Also, for example, since the subwoofer 210 is a special
speaker that reproduces the bass, it is designed by changing the internal impedance with other
speakers, or by shorting between the input terminals with a capacitor to lower the impedance at
high frequencies, etc. For example, not only the presence or absence of connection, but also the
type of speaker can be determined, and incorrect connection can be detected.
[0020]
As described later, since the system of the present invention is characterized by having the video
display unit 101, the detected speaker connection is shown on the display unit and a warning
can be displayed if there is an erroneous connection. For example, when the rear side speaker is
connected to the RL while the RR is not connected, this can be warned, and further, the RL side
can indicate that a signal obtained by adding the RL and the RR is output.
[0021]
In addition, for example, when the speakers are connected in 5.1 channels, a schematic layout
diagram of the speakers is displayed on the video display unit 101, a test signal is sent to each
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speaker, and the speakers on the video display unit blink simultaneously It is possible to easily
know the placement error of the speaker by having a function to make the user confirm whether
there is any contradiction with the direction in which the sound actually comes from.
[0022]
Next, a configuration for notifying the video and audio signal sources 301 and 302 of the fact
that the switcher 201 has detected the actually connected speaker will be described.
This is carried out by adding information of speaker connection to, for example, an Extended
Display Identification Data (EDID) signal established by Video Electronics Standards Association
(VESA) as an identifier, in order to realize a plug and play function. Although this EDID signal is
data describing the specification (corresponding to the applicable horizontal frequency range and
the number of pixels) of the display device, etc. as is well known, this embodiment adds
information on the connection state of the speaker to this EDID signal. The video / audio signal
sources 301 and 302 are notified.
[0023]
The switcher sends an EDID signal at the request of the video and audio signal source, but if the
speakers are detected in advance, the speaker in the initial state of the switcher 201 is not the
position information but the actually connected speakers. The rewritten EDID signal can be sent
to the information. If the EDID signal has already been sent before the detection of the speaker is
completed, the hot plug function is used after the detection is completed to temporarily
disconnect the switcher 201 and the video and audio signal sources 301 and 302 from one
another, and a new EDID signal again. To send For this purpose, whether or not the EDID signal
has been sent may be stored in a RAM (Random Access Memory) or the like. The hot plug
function is originally a function indicating that the audio reproduction device and the video audio
signal source are connected by cable, and it is conceivable that disconnection and reconnection
can not be recognized in a disconnection time of several tens of milliseconds. A cutting time of
about 0.5 to 2 seconds is desirable for reliable operation, and the function of the apparatus is
interrupted during the cutting time. If the hot plug dedicated line is prepared independently, it is
possible to virtually cut only the hot plug terminal, and the transmission of video and audio
signals may be continued. In preparation for the case where there is no hot plug function, it is
more convenient for the video and audio signal source to have a function to continue reading the
EDID data every predetermined time, for example, about 0.5 to 2 seconds.
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[0024]
Next, the video and audio transmission line 231 with the plug and play function will be
described. The case where the FR speaker 211 and the FL speaker 212 are not connected or does
not exist is considered with reference to the device block diagram of FIG. It is assumed that the
hatched speakers in the figure are connected by a speaker cable. The speaker cables 221 and
222 are drawn in broken lines in the figure and are not connected as indicated by the crosses.
The two speakers 211 and 212 are indispensable for obtaining a correct sound field feeling.
Therefore, when the switcher 201 detects that it is not connected by the detection of the speaker
by the switcher with audio amplifier 201 described above, the switcher 201 sends an audio
signal of the FR and FL channels to the video display unit 101, and the display unit has a right
Audio can be reproduced by the speaker 111 and the left speaker 112. Thereby, the problem due
to the absence of the front main speaker can be eliminated. The switcher 201 can know whether
the speaker is connected to the video display unit 101 by detecting the EDID signal transmitted
via the video / audio transmission line 231. For that purpose, by providing the video display unit
101 with the function of detecting whether or not the aforementioned speaker is actually
connected, it is possible to reproduce audio more correctly. When the FR speaker 211 and the FL
speaker 212 are connected and it is not necessary to use the right speaker 111 and the left
speaker 112 held by the display unit, the audio signal sent to the video display unit 101 is
stopped (Mute) It is good to send silent data or to send an audio signal whose level is lower than
usual.
[0025]
Further, as described above, the layout of the speakers as shown in FIG. 2 is displayed on the
video display unit 101 at the time of startup of the apparatus or the like, and it is easy for the
user to understand whether or not each speaker is connected. For this purpose, it is preferable to
provide an OSD (On Screen Display) circuit for displaying figures and characters on the switcher
201 or the like.
[0026]
In the example of FIG. 2, if audio of 5.1 channels is generated from the video and audio signal
sources 301 to 302, 5.1 channel audio reproduction using the speakers 111 and 112 of the
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8
video display unit is possible. Therefore, when it is detected that the speakers 211 and 212 are
not connected, guidance as schematically shown in FIG. 7 may be output to the image display
unit 101.
[0027]
As a modification of the above-mentioned matter, even if the speakers 211 and 212 of the FR
and FL channels are connected but the central speaker 210 of the C channel is not connected,
the switcher 201 transmits the audio signal of the C channel to the video display unit 101. And
the right speaker 111 and / or the left speaker 112 of the display unit may reproduce sound. As
a result, it is possible to obtain a rich sense of sound field using the speaker of the video display
unit 101.
[0028]
Currently, 5.1 channels of audio using channels FR, FL, C, RR, RL, and S can be played on DVD
etc., but in order to further increase the sense of reality in the future, the front right center
channel (FRC) ), It is conceivable to use 7.1-channel voice in which two channels of the front left
center channel (FLC) are added. When the speakers of the FR and FL channels are connected, in
general, it is preferable to reproduce the 7.1 channel audio using the FRC and FLC channels as
the speaker of the image display unit which is easier to position closer to the center than these.
The switcher 201 detects that the 5.1 channel speaker is connected by the method described
above, and detects the EDID signal transmitted through the video and audio transmission line
231, and the video display unit 101 detects the speaker. When it is known that the audio signal
of 7.1 channel is sent from the video / audio signal sources 301 to 302, the audio signal of the
FRC / FLC channel is displayed on the video / audio transmission line 231 among them. It is sent
to the part 101. In the case where audio of 7.1 channels can be reproduced as described above, if
the audio signals from the video and audio signal sources 301 to 302 are 5.1 channels, for
example, the switcher 201 performs matrix operation. The signal of the FRC and FLC channels
may be simulated to be sent to the video display unit 101.
[0029]
When the speakers 111 and 112 of the video display unit 101 described above are used, audio
signals to be supplied to these can be put on the video and audio transmission line 231 and can
be sent together with the video signal by one line. There is also an effect that the wiring becomes
easy because it is not necessary to draw the speaker cable each time.
09-05-2019
9
[0030]
Next, a case where only the speaker 211 of the FR channel is not connected will be considered
with reference to the device block diagram of FIG.
Naturally, with this as-is, a normal sound field can not be obtained. In this case, after detecting
that the speaker 211 is not connected, the switcher 201 may display a menu of characters and
the like schematically shown in FIG. The user selects a number in the figure and responds using,
for example, a remote controller. In the case of FIG. 8, if 1 is selected, reproduction is made in 2channel stereo using speakers 111 and 112 connected to the image display unit (monitor). If 2 is
selected, the speakers 211 and 212 will not be used, and the speakers 111 and 112 will be
reproduced as 5.1 channels together with the speakers 210, 213, 214 and 215 as main speakers.
If 3 is selected, on the assumption that the user connects the speaker 211, reproduction is
performed in 5.1 channels using the speakers 211 to 215. If 4 is selected, it is assumed that the
user connects the speaker 211, and reproduction is performed in 7.1 channels using the
speakers 111, 112 and 211 to 215. There is an effect that the voice can be reproduced
according to the user's selection.
[0031]
Such menu display and menu selection can be started not only at the point when the speaker
connection detection circuit detects a change in the speaker arrangement, but also at a user
instruction such as an arbitrary timing by the remote controller, the speaker connection
detection circuit malfunctions, etc. It is also useful as a countermeasure. Also, the switcher may
not be provided with the speaker connection detection circuit but may be performed only by the
user's instruction.
[0032]
If the gain for the audio signal is different between the video display unit 101 and the switcher
with audio amplifier 201, correct sense of reality can not be reproduced. For this purpose, it is
conceivable to standardize the gain values. However, at present, this standard does not exist, and
this is not easy especially between devices of different manufacturers. Since the remote
09-05-2019
10
controller is usually placed in the vicinity of the user, it is thought that a method of incorporating
a microphone, generating sound for each speaker and detecting it, and controlling the gain to
achieve an optimal balance is considered Be Further, there is also a method of providing a display
indicating the speaker arrangement on the video display unit 101, generating a sound while
flickering the corresponding speaker or the like, and requesting the user to make an adjustment
so as to be optimal. A method is also conceivable in which the arrangement of the speakers is
estimated by operating a speaker other than the test target speaker as a microphone.
[0033]
For example, when the audio of 7.1 channel is reproduced as described above by using the
speakers 111 and 112, it may be considered that the power of the video display unit 101 is cut
off halfway through in the music only program. In this case, it is preferable to switch the number
of channels to be output so that audio reproduction of 7.1 channels is performed when the
power of the video display unit 101 is on and 5.1 channels is off when the power is on. Whether
the power of the video display unit 101 is on or not is determined by re-transmission of the EDID
signal indicating that the speakers are not connected via the video / audio transmission line 231
using the hot plug function, the video / audio input circuit of the video display unit 101 Is
detected by the switcher 201 via the video and audio transmission line 231. When the switcher
201 detects that the power of the video display unit is turned off or turns off, the sound is
converted to 5.1 channel by matrix operation in the switcher 201 and sent to the respective
speakers 210 to 215. Also good. Further, after the connection between the video and audio
signal sources 301 to 302 and the switcher 201 is once disconnected by using the abovementioned hot plug function, a new EDID signal is transmitted and received, and an audio signal
sent out from the video and audio signal sources 301 to 302 It is good also as 5.1 channel. In
this way, it is always possible to reproduce sound suitable for the state of the speaker.
[0034]
In addition, in consideration of compatibility when using devices of different manufacturers, it is
desirable that switching using a hot plug allows about 0.5 to 2 seconds, during which time the
device can not function. Devices of the same manufacturer can perform switching in a shorter
time after confirming that they are models considering hot plug operation in a short time at the
time of design. Generally, the control signal is sent during the vertical blanking period of the
video signal, so the disconnection time by the hot plug operation can be made less than the
conventional 3 frames (about 200 ms) by interlaced scanning even in consideration of the
operation margin. . This has the effect of shortening the time for cutting.
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[0035]
Furthermore, when a speaker is connected to an audio channel that has not been connected at
the start of the operation, the audio can not be reproduced from the corresponding speaker as it
is. The newly connected speaker can also function by causing the hot plug function to operate
according to a user's command or the like and causing the result of newly detecting the abovementioned speaker connection to be added to the EDID signal and exchanged between the
devices. The block diagram of each component for realizing the above-mentioned thing is
demonstrated using FIG.4, FIG.5, FIG. 4 and 5 show a switcher 201 with an audio amplifier and a
video / audio signal source 301 (or 302), and FIG. 6 shows a video display unit 101.
[0036]
First, it will be described based on FIG. The video / audio signal source 301 comprises a video
signal source 30101, an audio signal source 30102, an audio superimposing circuit 30103, a
transmitting circuit 30104, and an audio channel number control circuit 30105. Although the
plug-and-play video / audio transmission line 331 for connection to the switcher 201 is actually
a single cable, it is shown separately for convenience of display 331A and 331B.
[0037]
The video signal source 30101 sends video information obtained from an apparatus such as
broadcast or DVD to the audio superimposing circuit 30103. The audio signal source 30102
similarly sends the audio information accompanying the video information to the audio
superimposing circuit 30103. The number of channels of audio information from the audio
signal source 30102 is determined in accordance with the instruction of the audio channel
number control circuit 30105. This channel number control may be performed by extracting the
required number of channels from audio data included in television broadcasting, DVD, and the
like. Also, conversion may be performed to reduce the number of channels as necessary, or to
generate signals in a pseudo manner to increase the number of channels. The indication of the
number of channels is determined by the EDID signal sent from the switcher 201 as described
later. The video signal and the audio signal multiplexed by the audio superimposing circuit
30103 are sent to the switcher 201 through the transmitting circuit 30104.
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[0038]
Next, the switcher with audio amplifier 201 includes a switch 20101, a reception circuit 20102,
an audio separation circuit 20103, an addition circuit 20104, an audio output circuit 20105, a
speaker connection detection circuit 20106, a control circuit 20107, an OSD circuit 20108, a
first EDID generation circuit. 20109, second EDID generation circuit 20110, switch 20111 and
speech superimposition circuit 20112 Further, although the video and audio transmission line
with plug and play function 231 for connection with the video display device 1 is actually a
single cable, it is shown separately for convenience of display. The speaker cables 220 to 225 are
independent as in FIG.
[0039]
A signal sent from the video / audio transmission line 331A with plug and play function to the
switcher with audio amplifier 201 is first given to the switch 20101. This is a switch for the plug
and play function described above. For example, when sending an EDID signal to notify one's
own status among the devices connected at the time of powering up of the devices, or detecting
that the connection of the speaker has been detected and the connection has been changed
during operation. When the EDID signal is sent, the switch 20101 is once opened (about 2
seconds at the maximum). The switching timing is given by the control circuit 20107. In normal
use, the circuit is closed, and the video and audio signal is supplied to the reception circuit
20102. The circuit of the switch 20101 is schematically shown, and at least when there is an
open circuit or level change of the hot plug terminal, the transmission and reception operation of
the video and audio may not necessarily be continued. Also, the hot plug dedicated line may be
disposed independently of the video transmission line.
[0040]
Next, the video signal and the audio signal are separated by the audio separation circuit 20103,
and the former is supplied to the addition circuit 20104 and the latter is supplied to the audio
output circuit 20105. Further, the control circuit 20107 is informed of the number of channels
of the voice signal actually received, as necessary. The audio output circuit 20105 may
correspond to, for example, 7.1 channels, but here, as in FIG. 1, it corresponds to 5.1 channels.
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[0041]
The output of each channel is provided with the speaker connection detection circuit 20106
according to the present invention, and the presence or absence of connection is detected by
measuring the impedance of the speaker connection terminal. According to the result, the control
circuit 20107 determines the number of audio channels optimal for reproduction, and instructs
the switch 20111 to select the optimum one of the first EDID generation circuit 20109 and the
second EDID generation circuit 20110. An EDID signal which can specify a specific audio channel
is selected and sent to the video and audio signal source 301. Of course, not only two types of
EDID signals but also many more selections may be made. It is not necessary to prepare a
plurality of all EDID data, and only a plurality of EDID portions relating to the number of audio
channels may be prepared and switched.
[0042]
The control circuit 20107 sends an instruction to the OSD circuit 20108 when displaying
characters as shown in FIGS. 7 and 8 and in connection diagrams as shown in FIGS. 2 and 3, etc.
A display signal is generated and applied to the addition circuit 20104. Here, addition or
replacement is performed on the video signal from the audio separation circuit 20103. If the
information currently being broadcast is being received while the display by the OSD circuit
20108 is being performed, the information may be superimposed and displayed as a background
image, but a reproduced image such as a DVD is sent. If there is, the playback operation of this
may be paused. The output of the adder circuit 20104 is given to the speech superimposing
circuit 20112.
[0043]
The control circuit 20107 described above issues an instruction to the audio superimposing
circuit 20112 when reproducing the audio using the speakers 111 and 112 of the video display
apparatus 1 as shown in the embodiments of FIG. 2 and FIG. 3 etc. The necessary one or two
channels of audio signals are superimposed on the video signal and sent to the video display
device 1. For the audio signal, either C channel only or two channels FR and FL are selected
according to the number of connected speakers of the video display device 1. Also, in the case of
7.1 channel, two channels of FRC and FLC may be selected, and two channels of FRC and FLC
may be artificially created and transmitted from a 5.1 channel audio signal.
09-05-2019
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[0044]
Although FIG. 4 shows an example in which signals are extracted in parallel from part of the
speaker connection terminals and input to the audio superimposing circuit 20112, the output of
the audio separation circuit 20103 may be input directly to the audio superimposing circuit
20112 . The speaker connection terminal is often an analog signal, which is advantageous when
the audio separation circuit 20103 and the audio superposition circuit 20112 handle digital
data. In FIG. 10 described later, the output of the audio separation circuit 20103 may be input to
the audio superposition circuit 20112 via the audio selection circuit 20205. Whether or not the
speaker of the video display device 1 is actually connected is transmitted to the control circuit
20107 as an EDID signal by similar means on the video display device 1 side as described later.
Based on these, the control circuit 20107 determines an instruction to the above-described audio
superimposing circuit 20112.
[0045]
FIG. 5 shows a block diagram in the case where the actual connection of the speakers is detected
but the function of actively utilizing the speakers of the image display device 1 is omitted in the
present invention. As compared with FIG. 4, the speech superimposing circuit 20112 is omitted.
[0046]
FIG. 6 is a block diagram showing an embodiment of the video display unit 101 in the present
invention. The configuration of FIG. 6 is the same as that of the switcher 201 of FIGS. 4 and 5
except that there is the video display body 10112 and audio signals are given to the two
speakers 111 and 112, so detailed description will be omitted. Here, a speaker connection
detection circuit 10106 for detecting whether or not the speaker of the video display unit 101 is
actually connected is provided, the result is sent to the control circuit, and the actual connection
state is sent to the switcher 201. It is characterized in that an EDID signal to notify is generated
so as to be able to receive an optimum voice signal as described above. The switch 10101 for the
plug-and-play function, the generation circuit of the EDID signal is not limited to two, and so on,
which are similar to the switcher 201 described above.
[0047]
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In the above description, as exemplified by EDID-RAM 20206 in FIG. 10 described later, a control
circuit for generating an EDID signal is configured by a RAM (Random Access Memory) or a flash
RAM, and the content is configured by a CPU or the like. If the circuit is rewritten and used, one
more generation circuit can be generated by one generation circuit.
[0048]
Next, another embodiment of the present invention will be described using the apparatus block
diagram of FIG.
A difference from FIG. 1 is that the switcher with audio amplifier 201 of FIG. 1 is divided into an
audio amplifier 202, a switcher 203, and other components in FIG. In this case, with regard to
the plug-and-play video / audio transmission line 231 for supplying a signal to the video display
unit 101, if this is connected to the switcher 203, an operation similar to that of FIG. 1 is
possible. Further, the speakers 210 to 215 are connected to the audio amplifier 202 via the
speaker cables 220 to 225 in the same manner as in FIG. 1. Accordingly, the switcher 203 has a
function of distributing the signals from the video and audio signal sources 301 and 302, sends
the video signal to the video display unit 101, and transmits each channel of the audio signal as
shown in the above embodiment. Are separately sent to the audio amplifier 202 and the video
display unit 101 according to the actual connection status of
[0049]
The operation changes depending on whether the audio transmission line 232 connecting the
audio amplifier 202 and the switcher 203 has a plug and play function. In the case of having a
function, this function is newly performed between the audio amplifier 202 and the switcher
203, but the other is the same as the case of FIG. On the other hand, when the user does not have
the function, the user is made to notify the device of a speaker that is actually connected to the
audio amplifier 202. For example, a method of inputting a channel connected using a remote
control, or making a video display unit touch panel type, displaying a display as shown in FIG. 2
and touching a mark of a connected speaker to input Is considered. In each embodiment, the case
where the video display apparatus 101 has two speakers has been described as an example, but
the present invention can be applied to one to three or more speakers, and the same idea as the
description of the present invention Thus, it is possible to realize multi-channel audio
reproduction using these.
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[0050]
Next, another embodiment of the present invention will be described using the apparatus block
diagram of FIG. It is assumed that a switcher 201 with an audio amplifier in FIG. 1 incorporates a
video / audio signal source such as a DVD or STB. In FIG. 10, 20201 is a video signal source,
20202 is an audio signal source, 20203 is a video signal switching switch, 20204 is an audio
signal switching switch, 20205 audio selection circuit, 20109 is an EDID-RAM, as shown in FIG.
The same components may be denoted by the same reference numerals.
[0051]
In FIG. 10, the EDID-RAM 20109 is used, but as described in FIG. 4, it works in the same manner
as switching of a plurality of EDIDs in FIG. Further, although an audio selection circuit 20205 is
provided to extract an audio signal to be transmitted to the video display device 1 from the
output of the audio separation circuit 20103 and send it to the audio superimposing circuit
20112, the operation is basically the same as FIG. For certain external signal sources 301, the
operation is the same as that of FIG.
[0052]
When the switches 20203 and 20204 select the video output of the internal video signal source
20201 and the audio output of the internal audio signal source 20202, there is no need to
exchange EDID data, and the direct control circuit 20107 directly controls the audio signal
source 20202 (Not shown) to set the optimal number of audio channel playbacks. The other
operations are the same as those of the external signal source 301 and thus will not be
described.
[0053]
Next, another embodiment of the present invention will be described using the apparatus block
diagram of FIG. This is the case where a headphone terminal is provided in the switcher with
audio amplifier 201 in FIG. In FIG. 11, reference numeral 226 denotes a headphone cable for
connecting a headphone terminal (not shown) of the switcher 201 and the headphone, and
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reference numeral 20207 denotes a headphone detection circuit. The same components as those
shown in FIG. 10 may be denoted by the same reference numerals. The basic operation is the
same as that of FIG. 10 and thus will be omitted, and will be described focusing on the
headphone connection operation.
[0054]
When a headphone is connected to the headphone terminal, the headphone detection circuit
20207 detects the connection of the headphone by mechanical contact opening / closing or
impedance detection of the headphone. The headphone detection signal is input to the audio
output circuit 20105 and the audio selection circuit 20205, and audio output to the speaker
cables 220 to 225 and audio output to the audio superimposing circuit 20112 are stopped
(silenced). Thereby, the sound output of all the speakers connected to the switcher 201 and the
speakers connected to the video display apparatus 1 can be stopped. When stopping the sound
connected to the video display device, there is also a method of sending a control signal to the
video display device so as to lower the volume of the video display device 1 besides muting the
input of the audio superimposing circuit 20112.
[0055]
Here, for example, if it is assumed that the 5.1ch speaker arrangement is taken before headphone
connection, the number of audio reproduction channels, such as whether the connected
headphone is stereo or monaural, decreases. This change in the number of channels is rewritten
to the speaker arrangement information of the 20206 EDID-RAM via the control 20107, and is
notified to the signal source 301 using the hot plug function of the switch 20101, and the audio
data suitable for headphones is the signal source 301 Is the output.
[0056]
Next, another embodiment of the present invention will be described using the block diagram of
the image display unit of FIG. This is a case where a headphone terminal is provided in the image
display unit 101 in FIG. In FIG. 12, reference numeral 123 denotes a headphone cable for
connecting a headphone terminal (not shown) of the image display unit 101 and the headphone,
10113 denotes a headphone detection circuit, and 10114 denotes an EDID-RAM. The part which
switches EDID-1 and EDID-2 by the switch 10111 in FIG. 6 is substituted by the EDID-RAM as in
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the embodiment of FIG. The other components that may be the same as those shown in FIG. 6 are
indicated by the same reference numerals. The basic operation is the same as that shown in FIG.
[0057]
When a headphone is connected to the headphone terminal, the headphone detection circuit
10113 detects the connection of the headphone by mechanical contact opening / closing or
impedance detection of the headphone. The headphone detection signal is input to the audio
output circuit 10105, and the audio output to the speaker cables 121 and 122 is stopped
(silenced). Thereby, the sound output of the speaker connected to the video display unit 101 can
be stopped.
[0058]
Here, if, for example, a speaker is not connected before headphone connection, a sound
reproduction function is added by connecting the headphone. This change is notified to the audio
processing device (not shown) such as an audio output device or a switcher using the hot plug
function of the switch 210101 while rewriting the speaker arrangement information of the EDIDRAM 10114 via the control 10107 and headphone The video display unit receives audio data
suitable for the above and reproduces the sound with headphones. If the audio processing
apparatus connected to the plug-and-play video / audio transmission line 231 is an audio
amplifier connected with a speaker, it is necessary to simultaneously stop the sound output of
these speakers. For this purpose, the audio amplifier can be notified by rewriting the abovementioned speaker arrangement information of the EDID-RAM.
[0059]
Further, although not shown, if a dedicated control line or remote control is used in combination,
the audio amplifier can be directly controlled to make the speaker silent. The method of using the
control line and the remote control together is effective when the stereo speakers are connected
to the video display unit 101 and when the stereo headphones are connected, they can not be
distinguished because the speaker arrangement of the EDID-RAM is the same. .
[0060]
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Although the switcher 201 is separated from the video and audio signal sources 301 and 302 or
the video display device 1 in the description of the above embodiment, the video and audio signal
sources 301 and 302 or the video display device 1 may be incorporated in the switcher 201 as
well. Good. In this case, although the configuration for transmitting the connection information
from the switcher 201 to the video and audio signal sources 301 and 302 is omitted, the
configuration for controlling the number of channels according to the detected connection status
is the same as that of the above embodiment.
[0061]
Furthermore, when program information is superimposed on a television broadcast signal, the
number of audio channels may be controlled based on the program information. Program
information is used to display the electronic program guide on a display. This program guide
usually represents the schedule of programs in the future for each channel. The program
information also relates to the title of the program, the name of the broadcasting station (Ch
number), the start and end time of the broadcast of the program, the type of the program (movie,
news, drama, etc.), and the number of audio channels reproduced in the program. Contains data.
[0062]
When the program is news, the 2Ch audio signal is often superimposed on the broadcast signal
of each program, if it is a movie or music program, the 5.1Ch or 7.1Ch audio signal. Therefore,
for news broadcast signals, the data indicating that the number of audio channels is 2Ch is that
for broadcast signals of movies and music programs, the number of audio channels is 5.1Ch or
7.1Ch. The data shown is added.
[0063]
Therefore, as another embodiment of the present invention, the program information is extracted
from the broadcast signal of the program selected by the user, and the audio Ch number control
circuit performs audio according to the data of the number of audio channels included in the
extracted program information. The signal source 30102 may be controlled. Therefore, if a news
program is selected and data indicating that the number of audio channels is 2 Ch is added to the
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broadcast signal, the audio is played back in 2 Ch even if the device has a 5.1 Ch speaker. Ru. On
the other hand, if a movie program is selected, data indicating that the number of audio channels
is 5.1 Ch is added to the broadcast signal, and the device has a 5.1 Ch speaker, use all the
speakers. Play audio. By configuring in this way, automatic control of the number of audio
channels can be realized according to the contents of the program.
[0064]
Furthermore, in the present invention, even if a movie to which only a 2Ch audio signal is added
is found to be a "movie" with data of a program type included in the program information, the
program is 5.1Ch. It is possible to simulate reproduction. In addition, even with news to which
only a 7.1 Ch audio signal is added, if it is found that the program is "news" in the data of the
program type included in the program information, the program should be simulated on 2 Ch. Is
also possible. That is, in this embodiment, as data for determining the number of audio channels
to be reproduced, data of the program type is preferentially used over channel number data
included in the program information.
[0065]
More specifically, the video and audio signal source 301 provided with a circuit for receiving a
television broadcast signal is 5.1 Ch or 7.1 Ch if the program information in the program
information of the received program indicates "movie". When the program information indicates
"news", data for reproducing the sound is stored in advance in 2Ch. That is, data of an
appropriate number of reproduced audio channels corresponding to the type of program is set in
advance for each type of program to form a table. The data in this table is used as an initial
setting for the number of audio channels to be reproduced. The table may be stored in a memory
in a microcomputer (not shown) or in another memory. The video and audio signal source 301
(microcomputer incorporated therein) extracts program information from the received television
broadcast signal, and determines the content of data of a program type included in the program
information. The determination result is referred to a table stored in the memory, and the
microcomputer reads data of the number of reproduced audio channels corresponding to the
determined program type from the memory. Using the data of the number of reproduced audio
channels, the program audio Ch number control circuit controls the audio signal source 30102
to control the number of audio channels to be reproduced. Such a configuration makes it possible
to reproduce audio with an appropriate number of channels according to the type of program.
The control of the number of reproduced audio channels using the above table may allow the
user to select permission / prohibition. In that case, it is preferable to use an OSD circuit to
09-05-2019
21
display a message regarding the selection on the display so as to interact with the user.
[0066]
FIG. 1 is a device block diagram illustrating an embodiment of the present invention. FIG. 7 is an
apparatus block diagram illustrating another embodiment of the present invention. FIG. 7 is an
apparatus block diagram illustrating another embodiment of the present invention. Block
diagram of signal source and switcher used in the present invention Block diagram of signal
source and switcher used in the present invention Block diagram of video display unit used in the
present invention Diagram showing display example in video display unit used in the present
invention Video used in the present invention The figure which shows the example of a display in
a display part The apparatus block diagram which shows another embodiment of this invention.
Block diagram of signal source and switcher with signal source used in the present invention.
Block diagram of signal source and switcher used in the present invention. Block diagram of
image display unit used in the present invention.
Explanation of sign
[0067]
DESCRIPTION OF SYMBOLS 1 ... Video display apparatus, 101 ... Video display part, 111 ... Right
speaker (R) which a display part has, 112 ... Left speaker (L) which a display part has, 121, 122 ...
Speaker cable, 2 ... Audio reproduction apparatus, 201 ... switcher with audio amplifier, 202 ...
audio amplifier, 203 ... switcher, 210 ... central speaker (C) connected to switcher, 211 ... front
right speaker (FR) connected to switcher, 212 ... connected to switcher Front left speaker (FL),
213: connected to switcher, right speaker (RR), 214: connected to switcher, left speaker (RL),
215: subwoofer (S) connected to switcher 221 to 225 speaker cable 231 audio and video
transmission line with plug and play function 23 2 audio transmission line 3 ... signal source, 301
... video audio signal source, 302 ... video audio signal source, 331, 332 ... Plug and Play function
with video and audio transmission line.
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