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JP2002199487

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DESCRIPTION JP2002199487
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus suitable for listening to three-dimensional sound such as a Dolby Digital sound
system, and more particularly to an audio apparatus capable of reducing the time and effort
required for connecting a speaker of a user. It is a thing.
[0002]
2. Description of the Related Art In a Dolby Digital multi-sound system adopted for a DVD (Digital
Versatile Disk: digital versatile disk), for each audio signal, L (Left: left), SW (Sub Woofer:
Subwoofer), C (Center: Center), R (Right: Right), SR (Surround Right: Surround Right), SL
(Surround Left: Surround Left) channels are defined, L channel speaker, R channel speaker , SL
channel speaker, SR channel speaker, C channel speaker, and SW speaker are disposed at
predetermined positions in the room, and output audio of L, R, SL, SR, C, and SW channels There
is. In a conventional multi-sound system, each amplifier is determined by the channel of the
audio signal that it outputs, and each speaker needs to be properly connected by a cable to the
channel's matching amplifier.
[0003]
SUMMARY OF THE INVENTION In the conventional multi-sound system, since an amplifier for
connecting each speaker is determined, the user is very careful about the connection between the
speaker and the amplifier when purchasing an audio device. When you move the speakers as the
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room is being remodeled, remove the cables one by one before moving the speakers, and after
moving the cables, match the channels between the cable to which they connect and the
channels of the amplifier and the speaker to which they connect As you do, you have to wire with
great care.
[0004]
An object of the present invention is to provide an audio device that can save the user the trouble
of connecting the speaker and amplifier correctly in order for the user to output the audio of the
correct audio channel from the speaker at each relative position. It is.
[0005]
SUMMARY OF THE INVENTION The audio apparatus of the first invention comprises the
following.
-A plurality of audio input points to which audio signals of each audio channel are input by
defining an audio channel which defines a listening position not only the position but also the
direction and also defining a relative output position with respect to the listening position for
each audio signal・ A plurality of amplifiers connected in a 1: 1 connection relation to a plurality
of speakers / speakers respectively arranged at relative positions corresponding to each audio
channel with respect to a listening position ・ A test signal is inputted to each amplifier When a
user outputs a speaker, the user is examined, and the correspondence between each amplifier
and each speaker according to the user input based on the examination (hereinafter referred to
as "amplifier-speaker correspondence").
A correspondence relationship registration means for registering a plurality of audio input points
and input sides of a plurality of amplifiers based on an amplifier-speaker correspondence
relationship so that audio of an audio channel corresponding to the relative direction is output
from the speaker Control means for controlling the connection of
[0006]
The plurality of speakers are, for example, an L channel speaker, an R channel speaker, an SL
channel speaker, an SR channel speaker, a C channel speaker, and an SW speaker in a Dolby
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Digital multi-sound system. Audio channels are, for example, L (Left: left), SW (Sub Woofer:
subwoofer), C (Center: center), R (Right: right), SR in a Dolby Digital multi-sound system, for
example. (Surround Right: surround right), SL (surround left: surround left) channels. Regarding
the relative position of each speaker with respect to the listening position, for example, in the
Dolby Digital multi-sound system, the speakers L, R, SL, SR, C, and SW are respectively left front,
right front, left rear, right rear , Center forward, and no relative position.
[0007]
Preferably, the amplifier is a main amplifier, and an audio signal from the integrated amplifier is
input to the audio input point.
[0008]
The user simply connects the speakers and the amplifiers in a 1: 1 connection relationship
without paying attention to the correspondence between the speakers and the amplifiers, which
says that which amplifier should be connected to which speaker.
This alleviates the user's attention in connection work. When a test signal is input to the input
side of each amplifier after connection of the speaker and the amplifier, audio is output from the
speaker connected to the amplifier. The user investigates which of the speakers from which the
audio has been output, and inputs this into the correspondence registration means. Thus, in the
correspondence registration unit, the amplifier-speaker correspondence as the correspondence
between each amplifier and each speaker is registered. For example, when there are 1 to 6
amplifiers and speakers of L, R, SL, SR, C, and SW, when a test signal is input to the amplifier 1, if
audio is output from the speaker SR, the amplifier 1 The correspondence relationship between
the speakers SR is stored, and then, when the test signal is input to the amplifier 2 and audio is
output from the speaker C, the correspondence relationship between the amplifier 2 and the
speaker C is stored. The connection control means controls the connection between the plurality
of audio input points and the plurality of amplifiers based on the amplifier-speaker
correspondence, whereby the audio of the corresponding audio channel from the speaker of each
relative value is output. .
[0009]
According to the audio apparatus of the second invention, in the audio apparatus of the first
invention, the connection control means responds to the user notification indicating that the
direction of the listening position is rotated based on the amplifier-speaker correspondence
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relation. The relative position of each speaker after rotation is determined as the relative position
after rotation, and each speaker outputs a plurality of audio signals of the audio channel
corresponding to the relative position after rotation. Change the connection between this audio
input point and the input side of multiple amplifiers.
[0010]
When the room is changed, etc., the direction of the listening position is changed.
Assuming that n is an integer and the direction of the listening position is rotated 90 · n °
clockwise, the relative position of each speaker with respect to the listening position after the
direction rotation is rotated 90 · n ° counterclockwise. The connection control means
determines the relative position of each speaker after the direction rotation of the listening
position based on the amplifier-speaker correspondence relationship as the relative position after
the direction rotation, and matches the relative position after the direction rotation based on the
amplifier-speaker correspondence relationship. The connection between the plurality of audio
input points and the input side of the plurality of amplifiers is changed. Thus, from each speaker,
the audio of the audio channel corresponding to the relative position after rotation is output.
[0011]
According to the audio apparatus of the third invention, in the audio apparatus of the second
invention, the relative output position to the listening position relative to the listening position is
the left relative to the listening position, and the relative output to the listening position If there
is a speaker whose position is in the center front, and there is no speaker whose relative position
after the change is in the center front of the listening position, the audio signal of the center front
audio channel is of the left front and right front audio channels. It is added to each audio signal.
[0012]
For example, in a Dolby Digital multi-sound system, there are speakers for C channel.
With the direction rotation of the listening position, the speaker may not be arranged in front of
the center of the listening position. In such a case, if the audio signal of the audio channel of C is
added to the audio channels of L and R, the speakers whose relative positions are L and R after
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the change are added to the audio to the original audio channels of L and R The audio of C is
output, and even without the speaker for C, the audio of the audio channel of C can be heard.
[0013]
According to the audio apparatus of the fourth aspect of the invention, the audio channel which
defines not only the position but also the defined listening position as well as the relative output
position relative to the listening position for each audio signal is defined, and the audio of each
audio channel is defined. A signal is transmitted from a common transmission means to a
corresponding speaker with built-in amplifier among a plurality of speakers with built-in
amplifier using an IEEE 1394 network, and in IEEE 1394, AM824 data of A & M protocol (Audio
and Data Transmission protocol) is In the AM 824 data, a label and audio data are defined, and
converted to audio data of AM 824 data of a different label for each audio channel, and each
audio signal has the same timing. The audio data of audio channels are combined into a common
audio data blocks, further, a plurality of audio data blocks are combined into a single isochronous
packet is delivered from the delivery means to the IEEE1394 network. In the audio device, the
transmission means has a plurality of input terminals for receiving audio signals separately for
each audio channel, assigns a determined label of AM824 data for each audio signal input to
each input terminal, and all audio channels And transmit the isochronous data carrying the AM
824 data to the IEEE 1394 network through a predetermined isochronous transfer channel. The
amplifier built-in speaker is disposed at a relative position corresponding to each audio channel
with respect to the listening position, and labels of the isochronous transfer channel and AM 824
data are instructed by the selection instructing means, and packets of the isochronous transfer
channel corresponding to the instruction Select the AM 824 data of the label corresponding to
the instruction of and output audio. In the correspondence registration means, when a test signal
is inputted to each input terminal of the sending means, the audio of the audio channel set in the
input terminal is outputted from the amplifier built-in speaker at the relative position
corresponding to the audio channel The user is examined by the user which receiving
isochronous transfer channel and label in the amplifier built-in speaker, and the correspondence
relationship between each amplifier built-in speaker and the receiving isochronous transfer
channel and label according to the user input based on the survey (hereinafter referred to as
“speaker It says "Correspondence relationship such as channel".
) Is registered. The selection instructing means instructs each speaker with built-in amplifier to
select an isochronous transfer channel and a label to be selected by the speaker with built-in
amplifier based on the correspondence relationship such as speaker-channel registered in the
relationship registration means.
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[0014]
In the fourth invention, the speaker compatible with the IEEE 1394 network is limited to a
speaker with a built-in amplifier. In the IEEE 1394 network, the user can connect the
transmitting means and the speakers with built-in amplifiers in, for example, a daisy chain type, a
star type, a tree type or the like. With these connections, there is no restriction that which
speaker must be connected to which output terminal of the delivery means, and the user can
greatly reduce the attention paid to the connection of the amplifier built-in speaker and the
delivery means. It should be noted that the labels that the delivery means assign to the audio
signal to each input terminal are fixed. Also, according to IEEE 1394, since the isochronous
transfer channel once assigned from the isochronous resource manager to the sending means
remains unchanged until the isochronous transfer channel is released, the isochronous transfer
channel in the test period maintains the subsequent main transfer period. Be done. Each
amplifier built-in speaker selects an isochronous transfer channel and a label to be received
based on an instruction from the selection instruction means. The sending means sends the test
signal to the input of the test signal to each input terminal using the corresponding isochronous
transfer channel and the label of AM 824 data at the input terminal. In response to the test signal
input to each input terminal of IEEE 1394, the user can output the audio of the audio channel
associated with the input terminal in order to output the audio from the amplifier built-in speaker
corresponding to the audio channel. The isochronous transfer channel and label to be selected by
the built-in speaker are investigated by trial and error, and the isochronous transfer channel and
label found as a result of the check are registered in association with the built-in amplifier
speaker. Thus, the correspondence registration means registers the label of the isochronous
transfer channel and the data of AM 824 when the audio of the corresponding audio channel is
outputted from the selection instructing means for all of the speakers with built-in amplifiers.
The selection instructing means instructs each amplifier built-in speaker based on the
correspondence relationship of the speaker-channel etc. with the isochronous transfer channel
and the label to be selected. Each amplifier built-in speaker extracts audio data based on the
isochronous transfer channel and label instructed from the selection instructing means when a
normal audio signal is inputted to the input terminal of the sending means instead of the test
signal, and the audio data is extracted Output audio related to audio data.
As described above, it is possible to correctly output the audio of each audio channel from the
corresponding amplifier built-in speaker while reducing the attention in the wiring to the
amplifier built-in speaker.
[0015]
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According to the audio device of the fifth aspect of the invention, in the audio device of the
fourth aspect of the invention, the selection instructing means responds to the user notification
that the direction of the listening position is to be rotated based on the correspondence
relationship such as speaker-channel. The relative position of each amplifier built-in speaker after
the rotation of the listening position is determined as the rotated relative position, and each
amplifier built-in speaker outputs the audio signal of the audio channel corresponding to the
relative rotation relative position. The isochronous transfer channel and the label to be selected
for each speaker with built-in amplifier are indicated to the speaker with built-in amplifier based
on the correspondence relationship of etc.
[0016]
When the room is changed, etc., the direction of the listening position is changed.
Assuming that n is an integer and the direction of the listening position is rotated 90 · n °
clockwise, the relative position of each speaker with respect to the listening position after the
direction rotation is rotated 90 · n ° counterclockwise. The selection instructing means
determines the relative position of each speaker after the direction rotation of the listening
position based on the correspondence relationship of the speaker-channel etc. as the relative
position after the direction rotation, and according to the relative position after the direction
rotation, the speaker-channel etc. Based on the correspondence relationship, the labels of the
reception isochronous transfer channels and AM 824 data to be selected of each speaker with
built-in amplifier are changed, and this is indicated to the speaker with built-in amplifier. Thus,
audio of the audio channel corresponding to the relative position after rotation is output from
each amplifier built-in speaker.
[0017]
According to the audio apparatus of the sixth invention, in the audio apparatus of the fifth
invention, the relative output position to the listening position relative to the listening position is
the left relative to the listening position, and the relative output to the listening position If there
is an amplified speaker whose position is in the center front and the relative position after the
change is in the center front of the listening position, the audio signal of the center front audio
channel is the left front and right front audio. It is added to each audio signal of the channel.
[0018]
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For example, in a Dolby Digital multi-sound system, there is an amplifier built-in speaker for C
channel.
With the rotation of the listening position, the amplifier built-in speaker may not be disposed in
front of the center of the listening position. In such a case, if the audio signal of the audio
channel of C is added to the audio channels of L and R, the amplifier built-in speaker whose
relative position after the change is L and R becomes audio to the original audio channels of L
and R In addition to C's audio output, you can hear the audio of C's audio channel without having
a built-in speaker for C's.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. FIG. 1 is a block diagram of a normal cable
connection type audio system 10 in which a cable is wired between each speaker and an
amplifier device 25. As shown in FIG. The audio room 13 is substantially rectangular in top view,
and the listening position 14 is located approximately at the center of the audio room 13 and is
oriented to one of four side walls. For convenience of description, the front, left side, right side,
and back side are defined as viewed from the user of the orientation of the listening position 14
of FIG. The L channel speaker 16 is disposed near the corner of the side wall of the front and left
side of the audio room 13, that is, the corner on the left front. The R channel speaker 17 is
disposed near the corner of the side wall of the front and right sides of the audio room 13, that
is, the corner on the right front. The SL channel speaker 18 is disposed near the corner of the
side wall on the back and left side of the audio room 13, that is, the corner on the left rear. The
SR channel speaker 19 is disposed in the vicinity of the corner of the side wall on the back and
right side of the audio room 13, that is, the corner on the right rear. The C-channel speaker 20 is
disposed at the center in the left-right direction of the front side wall. The SW speaker 21 may be
disposed anywhere in the audio room 13 and, for example, is disposed near the C-channel
speaker 20 in FIG. 1. The amplification device 25 has 1 to 6 corresponding to the number of L
channel speakers 16, R channel speakers 17, SL channel speakers 18, SR channel speakers 19, C
channel speakers 20, and SW speakers 21. It has an amplifier.
[0020]
The speaker position control circuit 29 has an audio signal input unit 30 to which each audio
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signal sent from the pre-main amplifier is input. Audio signals input to the audio signal input unit
30 are L (Left: left), SW (SubWoofer: subwoofer), C (Center: center), R (Right: right), SR (Surround
Right: surround right) It is an audio signal of six channels in total, SL (Surround Left: surround
left). As a source of audio signals of these L, R, SL, SR, C, and SW channels, for example, there is a
DVD player. The L channel speaker 16, the R channel speaker 17, the SL channel speaker 18, the
SR channel speaker 19, the C channel speaker 20, and the SW speaker 21 include L, R, SL, SR, C,
and SW. It is at a position associated with the position at which the audio signal of the channel is
output. The speaker position control circuit 29 further includes a crossbar switch type signal
switching unit 31, a mute circuit 32, and a test signal input unit 33. The crossbar switch type
signal switching unit 31 corresponds to 6 (the number of amplifiers in the amplifier device 25). )
× 6 (corresponding to the number of input points of the audio signal input unit 30). , And the
mute circuit 32 includes six crossbar switches corresponding to the number of amplifiers in the
amplifier apparatus 25 in a row, and the test signal input unit 33 includes the amplifier
apparatus 25. There are six crossbar switches in a row, corresponding to the number of
amplifiers. The crossbar switches of the crossbar switch type signal switching unit 31, the mute
circuit 32, and the test signal input unit 33 have an off (OFF) position, an ON (ON) 1 position, and
an ON (ON) 2 position. When the crossbar switch is in the off position, the crossbar switch type
signal switching unit 31 cuts off the connection between the audio input point of the audio signal
input unit 30 in the same column and the amplifier in the same row, and turns on 1 At the
position, the crossbar switch is connected to the audio input point of the audio signal input unit
30 in the same column and the amplifier in the same row. In the mute circuit 32, the crossbar
switch grounds the input end of the amplifier in the same row in the on 1 position, thereby
setting the output of the amplifier to 0 and muting the corresponding speaker, and in the off
position, the same. Disconnect the ground from the amp's input end of the row and stop muting.
The test signal input unit 33 is used in the test mode, and in the test mode, the crossbar switch
sends a test signal to the input side of the amplifier in the same row in the on 1 position, and the
test in the off position. Stop sending the signal. The adder circuit 34 is provided on each of the R
channel and L channel signal lines, and switches the audio signal to be sent to the crossbar
switch type signal switching unit 31. That is, while the audio signals of the R channel and L
channel of the audio signal input section 30 are sent as they are to the crossbar switch type
signal switching section 31 at the OFF position of each adding circuit 34, the ON position of each
adding circuit 34. The C channel audio signal from the audio signal input unit 30 is added to the
R channel and L channel audio signals of the audio signal input unit 30, respectively, and the
resultant signal is sent to the crossbar switch type signal switching unit 31. The listening
direction control manager 36 has a function of switching the position of the crossbar switch of
the test signal input unit 33 so as to input the test signal to the amplifier selected by the user.
The listening direction control manager 36 also sets the user-input-to-speaker correspondence
relationship based on the user input and determines which amplifier of the amplifier unit 25
outputs the test signal from which amplifier. In the listening mode, in the listening mode, the
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audio signal input to each audio input point of the audio signal input unit 30 through the premain amplifier is amplified by the amplifier of the amplifier device 25 and audio is output from
the speaker with the same channel. The position of the crossbar switch of the crossbar switch
type signal switching unit 31 is controlled based on the stored correspondence relationship
between the amplifier and the speaker so that the position of the crossbar switch is output.
[0021]
The setting procedure of the listening direction control manager 36 by the user and the
operation of the speaker position control circuit 29 will be sequentially described. (A) The user
usually uses the amplifier of the amplifier device 25 at the start of use of the cable connection
type audio system 10 and the L channel speaker 16, the R channel speaker 17, the SL channel
speaker 18, the SR channel speaker 19, the C channel The L channel speaker 16, the R channel
speaker 17, the SL channel speaker 18, the SR channel speaker 19, the C channel speaker 20,
and the SW speaker 21 in connection with the speaker 20 and the SW speaker 21. The L channel
speaker 16, the R channel speaker 17, the SL channel speaker 18, the SR channel speaker 19, the
C channel speaker 20 and the speaker 20 for the L channel simply without considering which
amplifier of the amplifier device 25 to connect to. Each of W speaker 21 to one of the amplifier
of the amplifier unit 25, a speaker: connecting one of the connection relationships: amplifier 1.
[0022]
(B) The user typically places the cabled audio system 10 in test mode. (C) The user operates the
listening direction control manager 36 to input a test signal to each amplifier in order. For
example, first, a test signal is input to the amplifier 1, the speaker from which the audio is output
is checked, and the setting corresponding to the audio output speaker is performed. In the
connection wiring of FIG. 1, since the L channel speaker 16 outputs audio when the test signal is
input to the amplifier 1, the user sets L in the amplifier 1 in the listening direction control
manager 36. I will do the operation. (D) In the same manner as (c), the user inputs the test signals
to the amplifiers 2 to 6 in order, and to the listening direction control manager 36 which speaker
is the audio output for each Set In the connection wiring of FIG. 1, SW, C, R, SR, and SL are set for
the amplifiers 2 to 6, respectively. (E) When the setting of the correspondence between the
amplifier and the speaker is completed, the user ends the test mode and switches to the listening
mode. When a speaker is present at the center of the front of the listening position 14, the two
adding circuits 34 are in the off position in the listening mode. The listening direction control
manager 36 is set to have an amplifier-speaker relationship, and in the listening mode, an audio
signal of the corresponding channel is input to each amplifier of the amplifier device 25, that is,
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audio of the corresponding channel from each speaker The position of each crossbar switch of
the crossbar switch type signal switching unit 31 is controlled by the listening direction control
manager 36 so that
[0023]
In the above (c) and (d), it is set in the listening direction control manager 36 which speaker the
audio is outputted to each amplifier, but conversely, which amplifier is assigned to each speaker
Can be set in the listening direction control manager 36, and as a result, the same amplifierspeaker correspondence can be set in the listening direction control manager 36. That is, test
signals are sequentially input to the amplifiers 1 to 6, and it is checked which amplifier outputs
audio from the L channel speaker 16 as the L channel, and the amplifier number is set to L.
Thereafter, in the same manner, amplifier numbers are set for the R, SL, SR, C, and SW speakers.
In the connection wiring of FIG. 1, amplifier numbers 1, 4, 6, 5, 3, 2 are set for L, R, SL, SR, C, and
SW, respectively.
[0024]
Consider a situation in which the direction of the listening position 14 is rotated by 90 · n
clockwise as viewed from the top as the audio room 13 is remodeled. The respective speakers in
the audio room 13 are rotated 90.n relative to the listening position 14 counterclockwise as
viewed from the top as the listening position 14 is rotated. When the user inputs information
corresponding to 90.n rotation clockwise, into the listening direction control manager 36, the
listening direction control manager 36 determines the relative direction of each speaker with
respect to the listening position 14 after the direction rotation based thereon. The position of
each crossbar switch of the crossbar switch type signal switching unit 31 is controlled so that the
audio of the channel corresponding to the changed relative direction is correctly output from
each speaker. For example, when n is 1, the L channel speaker 16, the R channel speaker 17, the
SL channel speaker 18, the SR channel speaker 19, the C channel speaker 20, and the SW
speaker 21 are SL and L respectively. , SR, R, no correspondence, and SW, and the crossbar
switch of the crossbar switch type signal switching unit 31 is controlled in position so that audio
signals of those channels are output from the corresponding amplifier. At this time, since there is
no speaker for outputting C channel audio, both addition circuits 34 are turned on to add the C
channel audio signal to the L and R channel audio signals, and the R channel speaker 17 and SR
channel The audio of L + C and R + C is outputted from the speaker 19 respectively, and thereby,
even though there is no C-compatible speaker, it is possible to listen to substantially the same
audio.
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[0025]
FIG. 2 is a block diagram of an IEEE 1394 bus connection type audio system 40 for sending an
audio signal to each speaker using an IEEE 1394 network. The L channel speaker 16, the R
channel speaker 17, the SL channel speaker 18, the SR channel speaker 19, the C channel
speaker 20, the SW speaker 21, and the IEEE 1394 interface 64 of the speaker position control
circuit 59 It is connected by the IEEE 1394 bus 41 using a connection method. The L channel
speaker 16, the R channel speaker 17, the SL channel speaker 18, the SR channel speaker 19, the
C channel speaker 20, and the SW speaker 21 are different from those in FIG. It has become.
[0026]
FIG. 4 is an explanatory diagram of an A & M protocol (Audio and Data Transmission protocol)
used for IEEE1394. In the isochronous transfer channel, an A & M protocol is used as a transfer
format of an audio signal. Audio signals of each audio channel (L, R, SL, SR, C, and SW) are
carried in AM 824 data of different labels. The AM 824 data is composed of an 8-bit label
followed by 24-bit audio data. The AM 824 data of the same timing are grouped into one audio
data block.
[0027]
FIG. 5 shows the relationship between audio data blocks and isochronous data in an isochronous
transfer channel. A plurality of audio data blocks generated in each isochronous period are
combined into one data packet. Each data packet is an isochronous resource manager, which is
an isochronous packet sandwiched between a ship header (CIP) and a CRC code or the like from
the front and back in the next isochronous period with respect to the isochronous period in
which it is generated. Are sent to the IEEE 1394 network by the isochronous transfer channel
assigned from
[0028]
FIG. 3 is an internal block diagram of the amplifier built-in speaker 44. As shown in FIG. The
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reception channel setting unit 47 sets the setting channel and the setting label packet
(hereinafter, the setting channel and the setting label are appropriately referred to as a
“reception channel” with respect to the isochronous transfer packet input to the IEEE 1394
interface 46. Only) extract it and decode it to get an audio signal. The audio signal is amplified by
the built-in amplifier 48 and output from the speaker unit 49 as audio. The L-channel speaker
16, the R-channel speaker 17, the SL-channel speaker 18, the SR-channel speaker 19, the Cchannel speaker 20, and the reception channel setting unit 47 of the SW speaker 21 can change
the reception channel freely. ing.
[0029]
In FIG. 2, in the speaker position control circuit 59, the audio signal input unit 60 has an input
point to which audio signals of L, R, SL, SR, C, and SW channels from the pre-main amplifier are
input, and packet generation It is connected to the corresponding input point of the part 63. The
correspondence between each input point of the audio signal input unit 60 and the input point of
the packet generation unit 63 is fixed, that is, the input points of the packet generation unit 63
are in order from top to bottom in FIG. It is determined that audio signals of C, R, SR, and SL
channels are input. In the mute circuit 32, in the on 1 position, each crossbar switch shorts the
input point of the audio signal input unit 60 in the same row to the ground to carry out the mute.
In the test mode, each crossbar switch of the test signal input unit 33 inputs the test signal to the
input terminal of the packet generation unit 63 in the same row at the ON 1 position. The packet
generation unit 63 creates AM 824 data with different labels for each input terminal, and
converts them into isochronous packets according to the procedure described above with
reference to FIGS. 4 and 5. The IEEE 1394 interface 64 outputs the isochronous packet
generated by the packet generation unit 63 to the IEEE 1394 bus 41 through the isochronous
transfer channel assigned by the isochronous resource manager. In the listening mode, each
crossbar switch of the mute circuit 32 and the test signal input unit 33 is in the ON 2 position,
whereby the audio signal of each input point of the audio signal input unit 60 goes straight and
generates packets in the same row. The signal is input to the input terminal of the section 63.
[0030]
The setting input of the listening direction control manager 68 by the user in the IEEE 1394 bus
connection type audio system 40 and the operation of the listening direction control manager 68
will be sequentially described. (A) The user uses the daisy chain method for the IEEE 1394
interface 64, the L channel speaker 16, the R channel speaker 17, the SL channel speaker 18, the
SR channel speaker 19, the C channel speaker 20, and the SW speaker 21. It is connected by the
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IEEE 1394 bus 41. With regard to this connection, the user is aware only whether each amplifier
built-in speaker is connected by the IEEE 1394 bus 41, and which amplifier built-in speaker is
associated with which amplifier built-in speaker or IEEE 1394 interface 64 You do not have to
think about it at all.
[0031]
(B) The user sets the IEEE 1394 bus connection type audio system 40 in the test mode, and
inputs a test signal to the L channel input point of the packet generation unit 63. Next, the user
sets the reception channel (= isochronous transfer channel + label of AM 824) of the L channel
speaker 16 via the listening direction control manager 68 so that the audio is output from the L
channel speaker 16.
[0032]
(C) Likewise, test signals are sequentially input to the SW, C, R, SR, and SL channel input points of
the packet generation unit 63, and audio is output from the amplifier built-in speaker
corresponding to each input point. As described above, the reception channel (= isochronous
transfer channel + label of AM 824) of the reception channel setting unit 47 in each amplifier
built-in speaker is set by the operation of the listening direction control manager 68. The
correspondence relationship between each input point of the packet generation unit 63 and the
speaker with built-in amplifier is equivalent to the correspondence relationship between the
channel with audio signal and the speaker with built-in amplifier, and further, the reception
channel (= isochronous transfer channel + label of AM 824)-amplifier This is equivalent to the
correspondence relationship of the built-in speakers, and thus the correspondence relationship
between each input point of the packet generation unit 63 and the built-in speaker is registered
in the listening direction control manager 68. It should be noted that, in the correspondence
relationship between the reception channel and the speaker with a built-in amplifier, it is to be
noted that the reception channels of the speakers with a built-in amplifier are not identical to
each other but are different. Further, since the isochronous transfer channel acquired from the
isochronous resource manager is held until the device acquiring the isochronous transfer
channel is released, the isochronous transfer channel acquired in the test mode is maintained in
the next listening mode.
[0033]
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(D) Thereafter, when the mode is switched to the listening mode, the audio signal of each channel
from the pre-main amplifier is input to the corresponding input point of the audio signal input
unit 60 and is further input to the input point of the packet generation unit 63 in the same row.
Be done. The packet generation unit 63 generates AM 824 data of a different label for each audio
signal of each input point, further converts it into isochronous packet, and sends it to the IEEE
1394 bus 41 through a predetermined isochronous transfer channel from the IEEE 1394
interface 64. In each amplifier built-in speaker, the listening direction control manager 68
demodulates and decodes the packet of the reception channel based on the correspondence
relationship between the reception channel and the built-in speaker set and registered therein,
and outputs the audio generated thereby . Therefore, audio of an audio channel corresponding to
the arrangement with respect to the listening position 14 is output from each amplifier built-in
speaker.
[0034]
In the IEEE 1394 bus connection type audio system 40, a situation is considered in which the
direction of the listening position 14 is rotated by 90 · n ° clockwise as viewed from the top due
to the remodeling of the audio room 13 or the like. Each amplifier built-in speaker in the audio
room 13 is rotated 90 · n counterclockwise as viewed from above as the relative position with
respect to the listening position 14 is rotated as the listening position 14 is rotated. When the
user inputs the upward corresponding to 90.n rotation in the clockwise direction to the listening
direction control manager 68, the listening direction control manager 68 determines the relative
positions of the speakers with respective amplifiers with respect to the listening position 14 after
the rotation. The direction is calculated, and from the speaker with built-in amplifier
corresponding to the relative direction after the orientation change of the listening position 14,
the audio of the channel corresponding to the speaker with built-in amplifier is correctly output.
Change the isochronous transfer channel + label of AM 824). For example, when n is 1, the L
channel speaker 16, the R channel speaker 17, the SL channel speaker 18, the SR channel
speaker 19, the C channel speaker 20, and the SW speaker 21 are SL and L respectively. , SR, R,
no correspondence, and SW, so that the audio of these channels is output from the
corresponding speaker with built-in amplifier, the reception channel (= isochronous transfer
channel + label of AM 824) of the speaker with built-in amplifier is changed. At this time, since
the amplifier built-in speaker for outputting the C channel audio is eliminated, the adding circuit
34 is turned on to add the C channel audio signal to the L and R channel audio signals. As a
result, the audio output from the R channel speaker 17 and the SR channel speaker 19 is added
with the C channel audio to the original L and R channel audio, and output. Even though it is not,
you can listen to the audio that is substantially the same.
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