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JP2008177887

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DESCRIPTION JP2008177887
An audio output apparatus capable of obtaining a surround effect by outputting an audio signal
transmitted using a power line as a communication medium from a speaker installed on a ceiling
above a listening position without requiring wiring of a surround speaker. And provide a
surround system. A connection means connected to a power supply terminal for lighting
equipment provided on a ceiling, a receiving means for receiving an audio signal inputted from
the connection means via a power line, and a matrix process for the received audio signal A
second signal processing unit that performs signal processing on the audio signal that has been
signal-processed by the first signal processing unit based on a head-related transfer function, and
a second signal processing unit that performs the signal processing of And a speaker for
outputting an audio signal subjected to signal processing by the processing means. [Selected
figure] Figure 1
Audio output device and surround system
[0001]
The present invention relates to an audio output device that outputs an audio signal received via
a power line, and a surround system technology that reproduces a multi-channel audio signal.
[0002]
When listening to multi-channel audio signals in a home theater system installed in a home, in
order to obtain a sufficient surround effect, in addition to a set of front speakers installed in front
of the listening position, a set of surround speakers Need to be installed.
09-05-2019
1
This surround speaker is installed at a position 60 cm to 90 cm above the height of the viewer's
ear at the listening position. For this reason, the viewer hangs the surround speaker on the wall
or installs the surround speaker using a speaker stand or the like.
[0003]
Also, an AV (Audio Visual) amplifier that outputs an audio signal to a front speaker or a surround
speaker is usually installed in front of the listening position. As described above, since the AV
amplifier and the surround speaker are separated, the speaker cable connecting the AV amplifier
and the surround speaker becomes long. It is necessary for the viewer to wire such that the
speaker cable connecting the AV amplifier and the surround speaker does not get in the way.
[0004]
On the other hand, as a conventional technique that does not require wiring to a surround
speaker, there is an audio device for supplying an audio signal superimposed on a power line to a
reproduction unit having a surround speaker provided in a lighting device mounted on a ceiling (
For example, refer to Patent Document 1). In this audio apparatus, the audio signal is
superimposed on the power line, and the audio signal is supplied to the reproduction unit
through the power line, so that the wiring of the speaker cable becomes unnecessary. Then, the
surround effect is obtained by reflecting the audio signal output from the reproduction unit using
the wall surface on the back side of the listening place.
[0005]
JP 2004-328678 A
[0006]
However, the audio signal obtained by the reflected sound from the wall on the back side of the
listening place as in the audio device disclosed in Patent Document 1 is insufficient for obtaining
the surround effect.
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2
There is also a problem that the room in which the audio device disclosed in Patent Document 1
is installed is limited. For example, when furniture is installed on a wall where the audio signal
output from the reproduction unit is reflected, the audio signal reflected by the furniture can not
obtain a sufficient surround effect. In this case, it is necessary to move the furniture installed on
the wall. In addition, due to the shape (windows, pillars, etc.) of the wall where the audio signal
output from the playback unit is reflected, it is not possible to reflect the audio signal output
from the playback unit using the wall on the back side of the listening place In some cases.
[0007]
The present invention has been made to solve the above-mentioned problems, and does not
require wiring for a surround speaker, and a speaker installed on a ceiling above a listening
position of an audio signal transmitted using a power line as a communication medium It is
characterized by providing an audio output device and a surround system which can obtain a
surround effect by outputting.
[0008]
In order to solve the above problems, an audio output device according to the present invention
is an audio output device for outputting an audio signal received through a power line, and a
connection means connected to a power supply terminal for lighting equipment provided on a
ceiling. And receiving means for receiving an audio signal input from the connecting means via a
power line, and signal processing means for performing signal processing to localize an audio
image at a predetermined position on the audio signal received by the receiving means. And a
speaker for outputting an audio signal subjected to signal processing by the signal processing
means.
[0009]
In the above audio output device, the signal processing means is a first signal processing means
for performing signal processing of matrix processing on the audio signal received by the
receiving means, and the signal processing is performed by the first signal processing means. A
feature of the present invention is second signal processing means for performing signal
processing on an audio signal based on a head-related transfer function.
[0010]
Further, in the above-described audio output device, the speaker is provided in a lighting device
connected to a power supply terminal for a lighting device provided on a ceiling.
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3
[0011]
In order to solve the above-mentioned problems, a surround system according to the present
invention is a surround system including an audio transmitting device for transmitting multichannel audio signals via a power line and an audio output device for outputting an audio signal
received via a power line. In the above, the audio transmitting device includes transmitting
means for transmitting an audio signal of a surround channel to the audio output device through
a power line, and the audio output device transmits an audio signal transmitted from the audio
transmitting device through the power line. Receiving means, signal processing means for
performing signal processing to localize a sound image to a predetermined position on the audio
signal received by the receiving means, and an audio signal subjected to signal processing by the
signal processing means Equipped with a speaker And wherein the door.
[0012]
In the above surround system, the signal processing means provided in the audio output device
comprises: first signal processing means for performing signal processing of matrix processing
on the audio signal received by the receiving means; and the first signal processing A second
signal processing means is provided for performing signal processing on the audio signal that
has been signal processed by the means based on the head-related transfer function.
[0013]
Further, in the above surround system, the audio output device is provided in a lighting device
connected to a power supply terminal for a lighting device provided on a ceiling.
[0014]
According to the present invention, the surround effect can be obtained by outputting the audio
signal transmitted using the power line as the communication medium from the speaker installed
on the ceiling above the listening position without the need for wiring of the surround speaker.
Audio output devices and surround systems can be provided.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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4
FIG. 1 is a block diagram showing the configuration of an audio output apparatus according to an
embodiment of the present invention.
As shown in FIG. 1, the audio output device 1 of this embodiment includes a connection unit 2, a
reception unit 3, an ADC (Analog to Digital Converter) 4, a signal processing unit 5, and a first
signal processing unit 6. And a second signal processing unit 7, a DAC (Digital to Analog
Converter) 8, an amplification unit 9, a speaker 10, a DAC 11, an amplification unit 12, and a
speaker 13.
[0016]
The audio output device 1 has a power line communication (PLC) function of performing
communication using a power line as a communication medium, and a left surround channel (SL)
and a right surround transmitted from an audio transmission device described later. The audio
signal of the channel (SR) is received, and the received SL and SR audio signals are output from
the speaker 10 and the speaker 13.
The connection unit 2 is connected to a power supply terminal for lighting equipment provided
on the ceiling of a room in which the home theater system is installed.
The power supply terminal is connected to a power line wired in the room.
The connection unit 2 inputs the AC power supplied from the power supply terminal to the
receiver 3.
[0017]
The receiving unit 3 separates the power line communication signal from the AC power supply
input from the connection unit 2.
This power line communication signal is a signal obtained by modulating an audio signal of SL
and SR into a signal to be superimposed on an AC power supply in an audio transmission device
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5
described later in order to transmit an audio signal from the audio output device to the audio
output device 1 via the power line. It is.
The receiving unit 3 demodulates the separated power line communication signal into an audio
signal of SL and SR, and receives an audio signal from the audio transmitting apparatus.
The ADC 4 converts the received SL and SR audio signals into digital audio signals. The converted
SL and SR digital audio signals are input to the signal processing unit 5.
[0018]
The signal processing unit 5 performs signal processing to localize the sound image at a
predetermined position on the input digital audio signal of SL and SR. In order to perform such
signal processing, the signal processing unit 5 includes a first signal processing unit 6 and a
second signal processing unit 7. The first signal processing unit 6 performs signal processing of
matrix processing on the digital audio signals of SL and SR input from the ADC 4. The first signal
processing unit 6 generates difference signals (SL-SR) and (SR-SL) of digital signals of SL and SR.
Then, a signal obtained by multiplying the generated difference signals (SL-SR) and (SR-SL) by K
is generated. This K is an arbitrary coefficient, and is set as the spreading effect adjustment of the
SL and SR audio signals. The first signal processing unit 6 generates a signal SL ′ obtained by
adding the generated K (SL-SR) to the SL digital audio signal. That is, the first signal processing
unit 6 generates an audio signal of SL ′ = SL + K (SL−SR).
[0019]
Similarly, the first signal processing unit 6 generates an audio signal of SR '= SR + K (SR-SL)
obtained by adding the generated K (SR-SL) to the digital audio signal of SR. The audio signals of
SL ′ and SR ′ generated by the signal processing of matrix processing by the first signal
processing unit 6 become audio signals having a spreading effect. As described above, the audio
signal of SL ′ and SR ′ having the spreading effect is generated by the first signal processing
unit 6, whereby the sound image of the audio signal output from the speaker 10 and the speaker
13 is expanded. For this reason, the space | interval of the speaker 10 and the speaker 13 to
install can be narrowed.
09-05-2019
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[0020]
The second signal processing unit 7 performs signal processing on the signals SL ′ and SR ′
generated by the first signal processing unit 6 based on the head related transfer function. The
head related transfer function is a function indicating the sound transmission from the sound
source to the head and ear canal entrance due to the shape of the head and the ear, and has
different characteristics depending on the direction of the sound source from the listening
position. Here, in the present embodiment, the positional relationship in the left, right, up, down,
front and back directions will be described with reference to the viewer facing in the front
direction where the front speaker and monitor are placed from the listening position.
[0021]
In this embodiment, the sound image is localized at a position where one set of surround
speakers is installed, that is, in the left and right directions of the viewer. For this reason, the
head related transfer functions required in the present embodiment are head related transfer
functions in the upper left and upper right directions and head related transfer functions in the
left and right directions of the viewer, and these are dummy head type recording microphones It
is possible to use a head transfer function measured and modeled using By using these head
related transfer functions, it is possible to arbitrarily determine the position (the left and right
direction and the up and down direction of the viewer) to which the sound image is localized.
[0022]
In this embodiment, the head related transfer function in the upper left direction is H (LUP), the
head related transfer function in the upper right direction is H (RUP), and the head related
transfer function in the left direction is H (L), The function is represented by H (R). These headrelated transfer functions are stored in advance in the memory in the second signal processing
unit 7. The second signal processing unit 7 has a head synthesized by multiplying H (L) by the
inverse function of H (LUP) to localize the sound image in the left direction of the viewer from
the upper left direction of the viewer. The transfer function H (L ') is obtained. The head related
transfer function H (L ') obtained in this manner is expressed as H (L') = H (L) / H (LUP), and
becomes the sound image direction of the viewer in the left direction.
[0023]
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The second signal processing unit 7 multiplies the head transfer function H (L ') by the signal of
SL' input from the first signal processing unit 6, and an audio signal SLim whose sound image is
localized in the left direction of the viewer Generate The audio signal SLim in which the sound
image is localized in this manner is expressed as SLim = SL ′ · H (L ′). The audio signal SLim is
a digital audio signal whose sound image is localized in the left direction of the viewer and is
input to the DAC 8.
[0024]
In addition, the second signal processing unit 7 is synthesized by multiplying H (R) by the inverse
function of H (RUP) in order to localize the sound image from the upper right direction of the
viewer to the right direction of the viewer. A head related transfer function H (R ') is obtained.
The head related transfer function H (R ') obtained in this manner is expressed as H (R') = H (R) /
H (RUP), and becomes the sound image direction of the viewer in the right direction.
[0025]
The second signal processing unit 7 multiplies the head transfer function H (R ') by the signal of
SR' input from the first signal processing unit 6, and the audio signal SRim in which the sound
image is localized in the right direction of the viewer Generate The audio signal SRim in which
the sound image is localized in this manner is expressed as SRim = SR ′ · H (R ′). The audio
signal SRim is a digital audio signal whose sound image is localized in the right direction of the
viewer, and is input to the DAC 11.
[0026]
The DAC 8 converts the audio signal SLim whose sound image is localized in the left direction of
the viewer input from the second signal processing unit 7 into an analog audio signal. The analog
audio signal converted by the DAC 8 is amplified by the amplifier 9 and output from the speaker
10. The DAC 11 converts the audio signal SRim whose sound image is localized in the right
direction of the viewer input from the second signal processing unit 7 into an analog audio
signal. The analog audio signal converted by the DAC 11 is amplified by the amplification unit 12
and output from the speaker 13.
09-05-2019
8
[0027]
FIG. 2 is a diagram showing the configuration of a surround system according to an embodiment
of the present invention. As shown in FIG. 2, in the surround system of the present embodiment,
the audio output device 1 provided in the lighting apparatus 40 is connected to the power line
30 via the connection unit 2, and the audio transmitting device 20 is connected to the plug 25
and the outlet 31. The audio transmission apparatus 20 transmits an audio signal to the audio
output apparatus 1 by using the power line 30 as a communication medium.
[0028]
The audio transmission device 20 is an AV amplifier having a power line carrier communication
function, and includes a decoding unit 21, a DAC 22, an amplification unit 23, and a transmission
unit 24, and a DVD (Digital Versatile Disc) player, a speaker, etc. It is connected. The audio
transmitting apparatus 20 decodes the multi-channel audio signal input from the DVD player via
the input terminal by the decoding unit 21. The decoded multi-channel audio signal is converted
by the DAC 22 into an analog audio signal.
[0029]
Among the multi-channel audio signals converted to analog signals, the SL and SR analog audio
signals are input to the transmitter 24 and analog audio of other channels (eg, left and right front
channels, center channel, subwoofer channel) The signal is input to the amplification unit 23. The
amplification unit 23 amplifies the input analog audio signal. The amplified analog audio signal
of each channel is output from the output terminal to the left and right front speakers, the center
speaker and the subwoofer speaker.
[0030]
The transmission unit 24 converts the input SL and SR analog audio signals into power line
communication signals. Then, the converted power line communication signal is superimposed
on the AC power supply. The power line communication signal superimposed on the AC power
09-05-2019
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supply is transmitted to the audio output device 1 through the plug 25 and the outlet 31 using
the power line 30 as a communication medium.
[0031]
The lighting device 40 provided with the audio output device 1 is of a sealing type attached to
the power supply terminal 33 for the lighting device provided on the ceiling 32, and is installed
above or behind the viewer. FIG. 3 is a diagram showing the configuration of the lighting device
40. As shown in FIG. FIG. 3A is a view showing a cross section of the lighting device 40, and FIG.
3B is a view showing a lower surface of the lighting device 40. As shown in FIG. The AC power
supplied from the power supply terminal 33 is input to the audio output device 1 and also input
to a fluorescent lamp driving unit (not shown). The fluorescent lamp driving unit controls lighting
of the fluorescent lamp 42.
[0032]
As for the audio signals of SL and SR received from the AC power supply by the audio output
device 1, the audio signal of SL is output from the speaker 10, and the audio signal of SR is
output from the speaker 13. Thus, the SL and SR audio signals received by the audio output
device 1 are output from the speaker 10 and the speaker 13 provided in the lighting device 40
installed on the ceiling. Therefore, the audio output device 1 can output an audio signal
regardless of the position of the furniture installed in the room.
[0033]
The lighting apparatus 40 has an arc-shaped cover portion 41, and an opening is provided at a
position where the speaker 10 and the speaker 13 of the cover portion 41 are attached. The
speaker 10 and the speaker 13 are attached to the periphery of the opening from the inside of
the cover 41 by screws or the like. As shown in FIG. 3 (b), the speaker 10 and the speaker 13 are
attached to the inside of the cover portion 41 at symmetrical positions from the center of the
lighting device 40. The orientation of the attached speaker 10 and the loudspeaker 13 is such
that the loudspeaker 10 is in the direction to the left of the viewer and the loudspeaker 13 is in
the direction to the right of the viewer.
09-05-2019
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[0034]
Next, the surround effect by the SL and SR audio signals output from the audio output device 1 of
this embodiment will be described. FIG. 4 is a diagram for explaining the sound image of the SL
and SR audio signals output from the audio output device of this embodiment.
[0035]
The audio signal of SL received by the audio output device 1 is subjected to matrix processing of
the first signal processing unit 6 to generate an audio signal of SL ′ having a spreading effect.
Then, the audio signal of SL ′ becomes an audio signal SLim in which a sound image is localized
in the left direction of the viewer by signal processing based on the head transfer function H (L
′) of the second signal processing unit 7. As described above, the audio output device 1 has a
spreading effect from the speaker 10 by performing matrix processing and signal processing
based on the head transfer function on the SL audio signal, and the sound image in the left
direction of the viewer is obtained. An audio signal SLim to be localized can be output.
[0036]
Also, the audio signal of SR received by the audio output device 1 is generated by the matrix
processing of the first signal processing unit 6 to generate an audio signal of SR ′ having a
spreading effect. Then, the audio signal of SR ′ becomes an audio signal SRim whose sound
image is localized in the right direction of the viewer by signal processing based on the head
transfer function H (R ′) of the second signal processing unit 7. As described above, the audio
output device 1 has a spreading effect from the speaker 10 by performing matrix processing and
signal processing based on the head related transfer function on the audio signal of SR, and a
sound image is emitted to the right of the viewer. An audio signal SRim to be localized can be
output.
[0037]
The viewer uses the surround system including the audio output device 1 and the audio
transmission device 20 according to the present embodiment, thereby the audio signal output
from the speaker 10 and the speaker 13 of the audio output device 1 and the audio transmission
device 20 Since the audio signals of the left and right front channels, center channel and
subwoofer channel decoded by the above can be listened to the audio signals output from the
09-05-2019
11
speakers of the respective channels, a sufficient surround effect can be obtained.
[0038]
As described above, the audio output apparatus 1 of this embodiment is provided in the lighting
apparatus 40 installed above or behind the viewer, and the SL and SR transmitted from the audio
transmission apparatus 20 using the power line as a communication medium Is configured to
receive an audio signal of
Then, the audio output device 1 performs the matrix processing and the signal processing of the
head related transfer function to the received SL and SR audio signals to localize the sound image
of the SL audio signal in the left direction of the viewer, The sound image of the audio signal can
be localized to the right of the viewer.
[0039]
The speaker 10 and the speaker 13 of the audio output device 1 are attached from the inside of
the cover portion 41 of the lighting device 40 in the direction of the viewer in the left-right
direction. Also, the audio transmitting device 20 transmits the SL and SR analog audio signals
among the multi-channel audio signals reproduced and input by the DVD player to the audio
output device 1 through the power line, and the audio signals of the other channels. Is outputted
to the speaker of each channel.
[0040]
According to these configurations, the viewer can view the multi-channel audio signal
reproduced by a DVD player or the like in a sufficient surround, without installing one set of
surround speakers and without wiring the speaker cable. it can.
[0041]
FIG. 1 is a block diagram showing the configuration of an audio output device according to an
embodiment of the present invention.
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12
FIG. 1 shows a configuration of a surround system according to an embodiment of the present
invention. FIG. 2 is a diagram showing the configuration of a lighting device 40. The figure
explaining the sound image of the audio signal of SL and SR output from an audio output device.
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 1 ... Audio output apparatus, 2 ... Connection part, 3 ... Reception
part, 4 ... ADC, 5 ... Signal processing part, 6 ... 1st signal processing part, 7 ... 2nd signal
processing part, 8 ... DAC, 9 ... Amplification part , 10: Speaker, 11: DAC, 12: amplifier, 13:
speaker, 20: audio transmitter, 21: decoder, 22: DAC, 23: amplifier, 24: transmitter, 25: plug, 30:
power line , 31 ... outlet, 32 ... ceiling, 33 ... power supply terminal, 40 ... lighting equipment
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