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JP2006129147

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DESCRIPTION JP2006129147
PROBLEM TO BE SOLVED: To provide a multi-channel compatible speaker system capable of
automatically outputting signals of appropriate channels to randomly connected speakers.
SOLUTION: When the number of channels is 5.1, a multi-channel speaker system is composed of
an AV amplifier for 5.1 channel system and a plurality of speakers 20-24. Each of the speakers
20 to 24 detects each of the speaker azimuth information θ to θ using an azimuth sensor, and
transmits the detected information to the 5.1 channel AV amplifier 101. 5.1The channel AV
amplifier 101 calculates the difference φ between the azimuth information of the speakers 21 to
24 and the azimuth information of the reference speaker 20. 5.1The channel AV amplifier 101
transmits an audio signal of a channel corresponding to each of the speakers 21 to 24 on the
basis of the above-described channel correspondence table associating φ with an output
channel. [Selected figure] Figure 1
マルチチャネルスピーカシステム
[0001]
The present invention relates to a multi-channel speaker system mainly used for audio devices.
[0002]
In a conventional multi-channel compatible AV amplifier, an audio signal output terminal for
outputting an audio signal is fixed for each channel.
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1
FIG. 7 shows a method of connecting a conventional AV amplifier and a speaker. A multi-channel
AV (audio-visual) amplifier 5 corresponding to 5 channels receives digital audio data from a DVD
(Digital Versatile Disc) player or the like and outputs an analog signal for each channel. Each
channel of the audio signal output from the multi-channel AV amplifier 1 corresponds to the
output from the following five directions for the user at the listening position 5 to listen to the
audio from the audio device. The five directions are: front left (L channel), front (C channel), front
right (R channel), rear left (LS channel), rear right (LS channel) to the user at listening position 5
facing a certain direction RS channel) direction. The multi-channel AV amplifier 1 includes a Cchannel output terminal 8 which is an audio signal output terminal for each channel, an Lchannel output terminal 9, an R-channel output terminal 10, an LS channel output terminal 11,
and an RS channel output terminal 12. Reference numerals 2C, 2L, 2R, 2LS and 2RS are speakers
for receiving audio signals from the audio signal output terminals 8 to 12 divided for each
channel of the multi-channel AV amplifier 1, and outputting the audio signals as voice, and
listening It is installed in front of position 5, left front, right front, left rear, and right rear.
[0003]
At the time of installation of the audio device, the user determines the listening position 5 and
installs five speakers 2C, 2L, 2R, 2LS, 2RS in the above-mentioned five directions with respect to
the listening position 5. The cables connected to the audio signal output terminals 8 to 12 of
each channel are connected to the speakers 2C, 2L, 2R, 2LS, and 2RS, respectively.
[0004]
FIG. 8 shows the configuration of a conventional AV amplifier 31 for 5.1 channel system.
Reference numeral 50 denotes an input terminal for receiving a signal from a device such as a
DVD player that outputs 5.1 channel digital audio data. Reference numeral 51 denotes a
decoding unit that extracts the signal for each channel by decoding digital audio data input from
the input terminal 50, converts the signal into an analog signal, and outputs the analog signal.
Reference numeral 52 denotes an amplifier unit that amplifies the signal of each channel input
from the decoding unit 51 and outputs the amplified signal to the speakers 54, 2C, 2L, 2R, 2LS,
and 2RS. Reference numeral 53 denotes a control unit that controls the decoding unit 51 and the
amplifier unit 52 according to the input of digital audio data to the decoding unit 51 and user
operation. Reference numerals 7 to 12 denote terminals for outputting audio signals of
respective channels of the subwoofer signals SW, C, L, R, LS, and RS.
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2
[0005]
By the way, in the above-mentioned audio apparatus, if the user does not exactly know which
output terminal 8 to 12 the cable should be connected to the installed five speakers 2C, 2L, 2R,
2LS, 2RS. If there is a mistake in connecting the cables from the output terminals 8 to 12 to the
speakers 2C, 2L, 2R, 2LS, 2RS, there is a problem that the user can not obtain an adequate
acoustic effect of the 5.1 channel AV amplifier 31 at all. The
[0006]
In addition, in patent document 1, in order to prevent the misconnection of a cable at the time of
the connection of the audio apparatus corresponding to a multichannel, and each speaker, the
output terminal of an audio signal and the connection plug of each cable connected to each
speaker are color-coded The invention of a terminal and a connection plug in which terminals of
each channel are collected is disclosed.
However, according to the invention of Patent Document 1, since the color of the connection
plug of the cable connected to the speaker is visually determined by a human, there is still the
possibility of erroneous connection. JP 2003-109706 A
[0007]
The present invention has been made in view of the above, and provides a multi-channel speaker
system that can automatically output musical tone signals of appropriate channels to speakers
that are randomly installed and connected. With the goal.
[0008]
In order to solve the above problems, the invention according to claim 1 comprises an audio
signal output device for outputting audio signals of a plurality of channels from a plurality of
output terminals, and a plurality of speakers connected to the plurality of output terminals. In the
multi-channel speaker system, the plurality of speakers include a speaker unit that converts the
audio signal into sound, and an azimuth information output unit that outputs azimuth
information indicating an azimuth of the sound output direction of the speaker unit. The audio
signal output device detects the channel to be sounded by each of the speakers based on the
azimuth information output from the plurality of speakers, and receives the detection result of
the detection means to detect the audio signals of the plurality of channels. And switching means
for switching to output the corresponding output terminal. A Chi-channel speaker system.
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[0009]
The invention according to claim 2 is characterized in that, in the invention according to claim 1,
the azimuth information output means is a magnetic sensor for detecting the strength of the
geomagnetism.
[0010]
According to the invention of claim 3, in the invention according to claim 1 or 2, the detection
means comprises in advance a table indicating the correspondence between the direction
information and the channel information, and using the table as direction information And
detecting a corresponding channel.
[0011]
The invention of claim 4 is characterized in that the detection means comprises speaker number
detection means for detecting the number of speakers connected to the output terminal, and a
plurality of tables showing correspondence between the direction information and the channel
information. And selecting a table corresponding to the number of speakers detected by the
number-of-speakers detection unit from the plurality of tables, and detecting a channel
corresponding to the direction information using the table. It is a multi-channel speaker system
as described.
[0012]
According to the present invention, even when audio signal output terminals are randomly
connected to a plurality of installed speakers, the musical tone signals of the appropriate channel
are automatically set to the installation positions of the respective speakers. It can be output.
[0013]
According to the invention as set forth in claim 4, the total number of speakers connected to the
multi-channel compatible AV amplifier can be automatically counted, and the optimum channel
correspondence table can be automatically used, so that the number of connected speakers can
be easily increased or decreased. It can correspond.
[0014]
Hereinafter, an embodiment of the present invention will be described with reference to the
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drawings.
FIG. 1 is a block diagram showing an audio apparatus to which the multi-channel speaker system
according to the embodiment is applied.
In this figure, 101 is an AV amplifier for 5.1 channel system (hereinafter referred to as AV
amplifier), 54 is a subwoofer for bass, and 20 to 24 are speakers.
[0015]
First, the speakers 20 to 24 will be described.
The speakers 20 to 24 have the same configuration, and the details are shown in FIG.
In the figure, reference numeral 61 denotes a speaker unit for generating a tone signal output
from the AV amplifier 101.
62 is an azimuth sensor incorporating a magnetic sensor, for example, and detects the azimuth in
the vertical direction (direction of arrow Y in the figure) of the front surface of the speaker unit
61, and the detected azimuth is a reference azimuth (for example, north direction of
geomagnetism) The angle formed is output to the transmission unit 63 as direction information.
The transmitting unit 63 transmits the azimuth information output from the azimuth sensor to
the AV amplifier 101.
[0016]
Next, in the AV amplifier 101, the decoding unit 51 decodes the 5.1 channel digital audio data
supplied to the input terminal 50, converts it into an analog signal for each channel, and outputs
it.
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The signal switching unit 104 switches each signal of the channels L, R, LS, and RS output from
the decoding unit 51 according to the switching signal output from the control unit 103 and
outputs the signal to the amplifier unit 52. The amplifier unit 52 amplifies the signals output
from the decoding unit 51 and the signal switching unit 104, and outputs the amplified signals to
the output terminals 115 and 110 to 114. The receiving unit 102 outputs the azimuth
information, which is output from the speakers 20 to 24 and received through the terminals 120
to 124, to the control unit 103. The control unit 103 detects where each of the speakers 20 to
24 is located based on each direction information, and outputs a switching signal to the signal
switching unit 104 according to the detection result. The details will be described later.
[0017]
Next, the operation at the time of speaker installation of the above-described audio apparatus will
be described with reference to FIGS. First, the user determines the listening position 5 as shown
in FIG. 3 and then installs the speaker 20 used for the C channel in front of the listening position
5. The speaker 20 is a reference speaker. Next, the user installs the speakers 21 to 24, for
example, right front, right back, left back, and left front. Here, the positions of the speakers 21 to
24 are completely optional. Each of the speakers 21 to 24 is installed such that the direction Y
(FIG. 4) of the built-in speaker unit 61 faces the listening position 5. Next, the user places the
subwoofer 54 at a predetermined position. Next, the user connects the output terminal 115 of
the AV amplifier 101 to the subwoofer 54 and the output terminal 110 to the speaker 20. Next,
the user connects the output terminals 111 to 114 to the speakers 21 to 24. Here, the speakers
21 to 24 to which the output terminals 111 to 114 are connected are completely arbitrary.
[0018]
Next, the user turns on the power to the AV amplifier 101. When the power is turned on, each
azimuth sensor 62 of the speakers 20 to 24 detects the azimuth of the speaker unit 61, and
outputs azimuth information indicating the angle between the detected azimuth and the
reference azimuth to the transmission unit 63. The transmitter 63 outputs the direction
information to the receiver 102 of the AV amplifier 101. On the other hand, when the AV
amplifier 101 is powered on, the control unit 103 first obtains the azimuth information θ0 (see
FIG. 3) of the reference speaker 20 via the terminal 120 and the receiving unit 102 (step in FIG.
4). S1).
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[0019]
Next, the control unit 103 generates a speaker number counter i and sets its initial value to 1
(step S2). Next, the control unit 103 determines whether the value of the speaker number
counter i is less than 5 (step S3). Here, a speaker whose azimuth information is θi is referred to
as a speaker i. If the number-of-speaker counter i is less than 5, the control unit 103 receives
from the speaker i the azimuth information θi of the speaker via any of the terminals 121 to
124 and the receiving unit 102 (step S4). Thereafter, the control unit 103 calculates and obtains
a difference φi = θi−θ0 between the azimuth information θi of the speaker i and the azimuth
information θ0 of the speaker 20 (step S5). Next, the control unit 103 refers to the channel
correspondence table for determining the channel to be assigned to each speaker, and
determines the channel of the speaker i from φi (step S6). Next, the control unit 103 adds 1 to
the number-of-speakers counter i (step S7), transitions to step S3, and repeats the abovedescribed process until channels are determined for four speakers.
[0020]
FIG. 5 shows a channel correspondence table. The column of symbols φ is the difference
between the azimuth information of the speaker for which the channel is to be determined and
the azimuth information of the reference speaker, and the column of symbols ch is a channel
corresponding to the value of φ described above. For example, if the direction information θ1
of the speaker 21 is 210 °, the difference φ1 = θ1−θ0 = 210 ° −180 ° = 30 ° between
the direction information θ1 of the speaker 21 and the direction information θ0 of the speaker
20 is obtained. Assign R channel signal to. If the azimuth information θ3 of the speaker 23 is 60
°, the difference φ3 = θ3−θ0 = 60 ° −180 ° = −120 ° = 240 ° between the azimuth
information θ3 of the speaker 23 and the azimuth information θ0 of the speaker 20, and the
control unit 103 assigns a signal of the LS channel to the speaker 23.
[0021]
As a result, even if four speakers 21 to 24 for the 5.1 channel system are randomly connected to
the output terminals 111 to 114, it is possible to automatically output musical tone signals of
appropriate channels at the installation positions of the respective speakers. .
[0022]
Furthermore, although the case where the speaker installed in the front of the listening position
5 was made into the reference | standard speaker 20 was shown in said 1st embodiment, by
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replacing the conversion table shown in FIG. It is possible to use the speaker to be installed as
the reference speaker 20.
[0023]
The subwoofer 54 differs in the shape of the speakers from the other speakers 21 to 24 and
connection errors between the speakers and the output terminal are less likely to occur.
Therefore, the signal SW of the bass channel output from the decoding unit 51 is output from the
output terminal 115 dedicated to the bass without passing through the signal switching unit 104.
The user fixedly connects the subwoofer 54 to the bass-only output terminal 115 when installing
the speaker of the above-described audio device.
[0024]
Next, a second embodiment of the present invention will be described. The present embodiment
is an application of the multi-channel speaker system of the present invention to a multi-channel
AV amplifier adapted to be compatible with a plurality of digital audio systems having different
numbers of channels, and a plurality of channel correspondence tables are previously stored in a
memory. It prepares, and changes the channel correspondence table automatically according to
the number of channels. In the configuration of the AV amplifier 101 shown in FIG. 1, the
configuration of the multi-channel AV amplifier referred to here is the number of channel signals
output from the decoding unit 51 according to the difference in the number of channels, The
number of output signals and the number of terminals attached to the AV amplifier 101 are
different, and the other configuration is the same.
[0025]
As shown in the flowchart of FIG. 6, first, the control unit 103 of the multi-channel AV amplifier
sequentially checks whether or not a speaker is connected to each terminal, and detects the
number N of connected speakers (step Sa1) ). Next, the control unit 103 selects a channel
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correspondence table corresponding to the number N of connected speakers (step Sa2).
Thereafter, as in the sequence of FIG. 6 in the first embodiment, the control unit 103 obtains the
azimuth information θ0 from the reference speaker 20 via the receiving unit 102 (step S1), and
the control unit 103 obtains the speaker number counter i. Is generated, and its initial value is
set to 1 (step S2). Next, the control unit 103 determines whether the value of the speaker
number counter i is less than the connection speaker number N acquired above (step Sa3). If the
speaker whose azimuth information is θi is the speaker i and the speaker number counter i is
less than N, the control unit 103 again performs the azimuth information θi of the speaker i,
similarly to the sequence of FIG. 6 in the first embodiment. It receives via the receiving part 102
(step S4). Thereafter, the control unit 103 calculates and obtains a difference φi = θi−θ0
between the azimuth information θi of the speaker i and the azimuth information θ0 of the
speaker 20 (step S5).
[0026]
Next, the control unit 103 refers to the channel correspondence table corresponding to the
number N of connected speakers selected above, and determines the channel of the speaker i
from φi (step S6). Next, after adding 1 to the number-of-speakers counter i (step S7), the control
section 103 transitions to step Sa3 and repeats the above process until channels are determined
for N-1 speakers excluding the reference speaker.
[0027]
As a result, the control unit of the multi-channel AV amplifier automatically recognizes the
number of speakers connected to itself, and thus automatically outputs an audio signal according
to the installation position to the N speakers connected. It is possible.
[0028]
Further, in the above embodiment, by incorporating the amplifier and the wireless transmission /
reception device in a plurality of speakers connected to the multi-channel AV amplifier, audio
data and control signals can be transmitted and received by wireless communication. It is
possible to eliminate complicated wiring between the AV amplifier and the plurality of speakers.
[0029]
Furthermore, instead of the above-described wireless transmission and reception, it is also
conceivable to transmit and receive voice data and control signals with a power cable using a
power line network technology such as an echonet.
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[0030]
As mentioned above, although one embodiment of this invention was explained in full detail with
reference to drawings, a concrete composition is not restricted to this embodiment, Design etc. of
a range which does not deviate from the gist of this invention are also included. .
[0031]
FIG. 2 is a block diagram showing the configuration of an AV amplifier for a 5.1 channel system
used in the first embodiment of the present invention.
It is a block diagram which shows the structure of the speaker used for the embodiment.
It is a figure which shows the angle difference of the reference azimuth which the azimuth |
direction sensor of a speaker detects, and direction of each speaker by the same embodiment.
It is a flowchart which shows the operation | movement which allocates the optimal channel
signal to the several speaker by the same embodiment.
It is an example of the channel corresponding | compatible table which allocates an optimal
channel signal to a several speaker in, when the azimuth | direction information of a reference |
standard speaker is 180 degrees by the same embodiment. A channel suitable for a plurality of
speakers in the case where the multi-channel AV amplifier automatically detects the number of
connected speakers and automatically selects a channel correspondence table suitable for the
number of connected speakers according to the second embodiment of the present invention It is
a flowchart which shows the operation | movement which allocates a signal. It is a block diagram
which shows the conventional audio device and the connection method of a speaker. FIG. 7 is a
block diagram showing a configuration of a conventional AV amplifier for 5.1 channel system.
Explanation of sign
[0032]
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1 multichannel AV amplifier 2C 2L 2R 2L 2 RS 2 speaker 5 listening position 7 subwoofer output
terminal 8 C channel output terminal 9 L channel output terminal 10 R channel output Terminals
11 LS channel output terminals 12 RS channel output terminals 20 speakers (reference speakers)
21 to 24 speakers 31 AV amplifier for 5.1 channel system (conventional) 50 input terminals 51
decoding 5, 52: amplifier unit, 53: control unit, 54: subwoofer, 61: speaker, 62: azimuth sensor,
63: transmission unit, 101: AV amplifier for 5.1 channel system, 102: reception unit, 103: control
unit, 104 ... signal switching unit, 110 to 115 ... output terminal, 120 to 124 ... terminal, SW ...
signal for subwoofer, C ... C channel signal, L ... L channel signal, R ... R channel signal, LS: LS
channel signal, RS: RS channel signal, θ0 to θ4: speaker azimuth information.
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