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JP2006067218

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006067218
The present invention provides an audio reproduction apparatus capable of changing beam
settings with a simple configuration in reproduction of a multi-channel audio signal by an audio
beam using an array speaker. In a system in which an audio signal is beam-output from an array
speaker for multi-channel reproduction, a plurality of beam setting patterns (reproduction
modes) are stored in a memory of a control unit. This beam setting pattern consists of one basic
pattern and a plurality of deformation patterns using beam control data of this basic pattern.
When the user designates the reproduction mode via the user interface, the beam setting pattern
corresponding to the mode is read out and set in the signal processing unit of each channel.
[Selected figure] Figure 3
Audio playback device
[0001]
The present invention relates to an audio reproduction apparatus that reproduces a multichannel audio signal using an array speaker.
[0002]
As a device for reproducing multi-channel audio, a real multi-speaker system has conventionally
been put into practical use in which a plurality of (for example, six) speakers are installed.
[0003]
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Further, in recent years, an apparatus for reproducing multi-channel audio by beam-outputting
an audio signal using one array speaker has also been proposed (for example, Patent Document
1).
In the device of Patent Document 1, by inputting the same audio signal to each of the speaker
units simultaneously or by changing the timing, this audio signal can be output as a beam based
on the principle of superposition.
That is, as shown in FIG. 2, the beam is formed obliquely by inputting an audio signal while
shifting the timing little by little for each speaker unit, and the timing shift time (delay time)
should be set appropriately. Thus, directivity can be controlled in a desired direction to form an
audio beam.
[0004]
By using this property of the array speaker to appropriately set the delay time of the audio signal
of each channel of the multi-channel audio signal and input it to the array speaker, the audio
signal of each channel can be As shown in), they are output as beams in different directions.
[0005]
In the example of FIG. 3A, the center channel C (the audio signal of the same: the same applies
hereinafter) is directly output toward the listener on the front, but the front left channel FL and
the front right channel FR are reflected once at the side wall To the listener, and the surround left
channel SL and the surround right channel SR are reflected twice by the side wall and the back
wall before reaching the listener, so the audio signals of each channel come to the listener from
different directions As you can see, this makes it possible to realize multi-channel audio playback.
Japanese Patent Publication No. 2003-510924
[0006]
On the other hand, although there are various types of multi-channel content such as movies of
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various genres, concert videos, etc., the spread of the sound image desired by the user may differ
depending on the type of the content. For example, in the case of a large-scale movie, the sound
image is spread over the entire surroundings, and in the case of a concert or a drama with many
words, etc., the sound is mainly heard from the front without spreading the sound image.
[0007]
In the conventional real multi-speaker system, the location of the speakers is fixed, and the
change of the sound image has been performed by the decoder or post processing. On the other
hand, in the method using an array speaker, a virtual speaker can be formed on the wall of a
room by beam control. Since this virtual speaker can instantaneously realize an effect equivalent
to the movement of the installation position difficult with real speakers only by changing its
parameters, this feature can be used as a variable function of the sound image unique to the
array speaker. In order to realize this function, it is necessary to control the beam setting of each
channel with parameters different from the usual according to the sound image (reproduction
form). For this purpose, parameters must be prepared for each reproduction mode, but if
parameters are calculated for each switching, processing time will be long. In addition, when
parameters for each reproduction mode are calculated at the time of initial setting, there is a
problem that the amount of data to be stored and managed increases.
[0008]
An object of the present invention is to provide an audio reproduction apparatus capable of
changing beam settings with a simple configuration in reproduction of a multi-channel audio
signal by an audio beam using an array speaker.
[0009]
According to the first aspect of the present invention, an array speaker in which a plurality of
speaker units are arranged in a matrix or in a line, and a multi-channel audio signal are input,
and audio of each channel is input based on directivity control data set for each channel.
Correspondence is made between directivity control means for controlling the directivity in
directions independent of each other, directivity control data storage means for storing
directivity control data for each channel, and directivity control data for each channel. Pattern
storing means for storing a basic pattern to be assigned to the target channel, and a deformation
pattern for assigning directivity control data for different channels to some or all of the channels,
and a pattern selecting means for selecting the basic pattern or the deformation pattern; Based
on the pattern selected by the pattern selection means It can be characterized by and a control
means for setting directivity control data to the directivity control means.
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[0010]
The invention of claim 2 is an array speaker in which a plurality of speaker units are arranged in
a matrix or in a line, a center channel directivity control data for controlling directivity so as to
output an audio signal to a listening position, audio Front channel directivity control data to
control directivity to reflect signal to left or right wall to reach listening position Reflect audio
signal to left or right wall and back wall to reach listening position Audio control comprising:
directivity control data for surround channels for controlling directivity; and directivity control
units for independently controlling directivity of multi-channel audio signals and inputting them
to an array speaker Method for controlling directivity in an apparatus, comprising: centering an
audio signal of a center channel; Control the directivity using the channel directivity control data,
control the directivity of the front channel audio signal using the center channel directivity
control data or a preset fixed value, and output the surround channel audio signal It is
characterized in that directivity is controlled using directivity control data for the front channel.
[0011]
The invention of claim 3 is an array speaker in which a plurality of speaker units are arranged in
a matrix or in a line, a center channel directivity control data for controlling directivity so as to
output an audio signal to a listening position, audio Front channel directivity control data to
control directivity to reflect signal to left or right wall to reach listening position Reflect audio
signal to left or right wall and back wall to reach listening position Audio control comprising:
directivity control data for surround channels for controlling directivity; and directivity control
units for independently controlling directivity of multi-channel audio signals and inputting them
to an array speaker Method for controlling directivity in an apparatus, comprising: centering an
audio signal of a center channel; Control the directivity using channel directivity control data,
control the directivity of the front channel audio signal using front channel directivity control
data, and control the surround channel audio signal for front channel directivity control data To
control the directivity.
[0012]
The invention of claim 4 is an array speaker in which a plurality of speaker units are arranged in
a matrix or in a line, a center channel directivity control data for controlling directivity so as to
output an audio signal to a listening position, audio Front channel directivity control data to
control directivity to reflect signal to left or right wall to reach listening position Reflect audio
signal to left or right wall and back wall to reach listening position Audio control comprising:
directivity control data for surround channels for controlling directivity; and directivity control
units for independently controlling directivity of multi-channel audio signals and inputting them
to an array speaker Method for controlling directivity in an apparatus, comprising: centering an
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audio signal of a center channel; It is characterized in that directivity is controlled using channel
directivity control data, and directivity is controlled by using front channel and surround channel
audio signals using center channel directivity control data or a preset fixed value. Do.
[0013]
The invention of claim 5 is an array speaker in which a plurality of speaker units are arranged in
a matrix or in a line, a center channel directivity control data for controlling directivity so as to
output an audio signal toward a listening position, audio Front channel directivity control data to
control directivity to reflect signal to left or right wall to reach listening position Reflect audio
signal to left or right wall and back wall to reach listening position Audio control comprising:
directivity control data for surround channels for controlling directivity; and directivity control
units for independently controlling directivity of multi-channel audio signals and inputting them
to an array speaker Method of directivity control in a device, comprising: center channel and
surround channel The audio signal is downmixed to an audio signal of two front channels, and
the directivity of the downmixed audio signal is controlled using center channel directivity
control data or a preset fixed value. Do.
[0014]
In the present invention, multichannel audio signals can be reproduced by controlling the
directivity.
In the normal mode, for example, (the audio signals of the front left and right channels are
reflected once by the left and right wall surfaces to reach the listener, and the surround left and
right channels are reflected by the left and right wall surfaces and the rear wall The center
channel reaches the listener with direct sound.
The multi-channel audio signal is output with the basic directivity control pattern of
[0015]
Furthermore, by changing the directivity control pattern from the above basic one, it is possible
to change the localization of each channel to change the spread of the sound image.
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For example, “the front left and right channels are controlled by the directivity control data of
the center channel, and the surround left and right channels are controlled by the directivity
control data of the front left and right channels.
」などである。
This makes it possible to divert the directivity control data of the basic pattern and control the
directivity to different patterns without calculating and storing new directivity control data.
[0016]
Here, the directivity control pattern (beam setting pattern) corresponds to the installation place
of the speaker in the real multi-speaker system.
The directivity control pattern can be changed only by changing the directivity control data set
for each channel. Therefore, just by the user changing the setting according to the reproduction
content and the reproduction environment, it is possible to install the speaker as if in real time
You can get the effect as if you changed the position. For example, if a plurality of directivity
control patterns are stored in advance in a table, and setting patterns can be freely made by
buttons on the remote control, setting change becomes easier for the user.
[0017]
According to the present invention, a basic set of directivity control data is diverted to another
channel, a plurality of directivity control patterns are created, and each of them can be selected
as a playback mode. There is no need to create one mode, which makes setting easy. In addition,
the storage area and data processing load can be reduced and the system design can be
simplified by minimizing the data to be stored and managed.
[0018]
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A multi-channel audio system which is an embodiment of the present invention will be described
with reference to the drawings. This audio system can reproduce five channels of multi-channel
audio signals without setting up a five speaker system by using one array speaker and beaming
out the audio signal of each channel. It is a system. As a pattern of directivity control (beam
setting) of each channel, one basic pattern (5 channels A: see FIG. 3A) and four modified patterns
using beam control data of this basic pattern (FIG. 3) (B) to (E) are stored in the table (see FIG. 4).
[0019]
The array speaker uses a line array speaker system in which small-sized speakers (speaker units)
are arranged in a honeycomb shape as shown in FIG. The array speaker is not limited to the
illustrated one, and a plurality of speaker units arranged in a row or matrix may be used.
[0020]
In such an array speaker, as shown in FIG. 2, the same audio signal is output from each speaker
unit, and the output timing in each speaker unit is adjusted so that the time to reach a
predetermined point (focus) in space coincides. By doing this, the audio signal can be output as a
beam having directivity in the focal direction according to the principle of superposition.
[0021]
By utilizing this property of the array speaker, the audio signal of each channel of the multichannel audio signal is controlled to be beamed in different directions respectively and input to
the array speaker (in each speaker unit, each channel Audio signals of each channel are
superimposed and input without overlapping, for example, as shown in FIG. 3 (A), beaming is
propagated in different directions and propagated to the listener. Incident from different
directions.
[0022]
In order to control the beam direction, tap data (delay data) to control the output timing to each
speaker unit based on the path length (focal length) and the focal direction (beam angle), and to
compensate for attenuation due to reflection The gain correction value to set the gain to be input
to the gain multiplier and parameters (beam control data) such as equalize data to set the
equalizer to compensate for the change in sound quality due to the beam angle and the material
of the reflecting wall are required. Beam control data of each channel shown in FIG. 3A (center
channel beam control data, front left channel beam control data, front right channel beam control
data, surround left channel beam control data, surround right channel Beam control data) is
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stored in the memory 11 (see FIG. 5) Are 憶.
[0023]
The beam setting pattern in FIG. 3A is a basic form (basic pattern) of multi-channel reproduction
by an array speaker, and is an example in which a rectangular room close to a square is used
longitudinally and the array speaker is installed at the center of the wall. .
In this room shape, the audio signal of each channel is output as follows.
The center channel C (the audio signal of the same: the same applies hereinafter) is directly
output to the listener on the front.
The center channel C may or may not be beamed. The front left channel FL and the front right
channel FR are beamed to be reflected once at the side wall to reach the listener. The surround
left channel SL and the surround right channel SR are beamed so as to reach the listener after
being reflected twice by the side wall and the rear wall. As a result, for the listener, the center
channel C comes from the front, the front left channel FL and the front right channel FR come
from the front left and right, and the surround left channel SL and the surround right channel SR
from the left rear and right It sounds as it has arrived, and this makes it possible to artificially
reproduce multi-channel audio.
[0024]
In this multi-channel audio system, using beam control data used in the basic pattern shown in
FIG. 3 (A), beam setting patterns of the deformations shown in FIG. 3 (B), (C), (D) and (E). Can
play the audio signal of each channel.
[0025]
The beam setting patterns of FIGS. 3A to 3E are registered in the pattern table shown in FIG.
This pattern table is written in the memory of the control unit.
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[0026]
In the pattern table of FIG. 4, mode 1 is the basic pattern (5 channels A) shown in FIG. This
pattern is a basic pattern that simulates a real multi-speaker system in an ideal environment
having left and right side walls reflecting the sound and a rear wall.
[0027]
Mode 2 is a pattern of five channels B shown in FIG. In this pattern, the front left and right
channels FL and FR are directly output to the listener as a sound using the beam control data of
the center channel of the basic pattern or a preset fixed value, and the surround left and right
channels SL and SR are basic pattern The beam control data of the front left and right channels
are used to reflect the light once at the side wall and output so as to reach the listener. The audio
signal of the front channel is output from the speaker units in a partial area on the left and right
of the array speaker as shown in FIG. 1 (B) to avoid beam formation. For this reason, the output
level is increased by + α with respect to the level setting value of the center channel so that the
volume balance with other channels is not broken.
[0028]
This deformation pattern is a pattern suitable for, for example, a case where the front channel is
too wide in the standard pattern when rear reflection is not possible because there is no rear
wall, the sound coming from behind such as music content is unnatural.
[0029]
Mode 3 is a pattern of three channels A shown in FIG.
In this modified pattern, the front left and right channels FL and FR and the center channel C are
controlled by beam control data as in the basic pattern, and the surround left and right channels
SL and SR are side walls using beam control data on the left and right front channels of the basic
pattern. The signal is reflected once and output so as to reach the listener. This deformation
pattern is a pattern suitable when, for example, there is no rear wall and rear reflection is not
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possible and a feeling of expansion of the sound image is desired.
[0030]
Mode 4 is a pattern of 3 channels B shown in FIG. In this modified pattern, the front left and right
channels FL and FR and the surround left and right channels SL and SR are used as beam control
data of the center channel of the basic pattern or fixed values set in advance, from the speaker
units of the left and right partial areas of the array speaker Directly output to the listener with
sound. This deformation pattern is a pattern suitable for use environments where reflection can
not be expected at all, or when clarity of speech is desired.
[0031]
Mode 5 is a two-channel pattern shown in FIG. In this modified pattern, the center channel C and
surround channels SL and SR are downmixed to the front left and right channels FL and FR by
the decoder, and the downmixed front left and right channels FL and FR are beam control data of
the center channel of the basic pattern or Using a preset fixed value, direct output from the
speaker units of the partial areas on the left and right of the array speaker toward the listener is
made. This deformation pattern is a pattern suitable for use as a normal stereo speaker, such as
when watching TV, or in a use environment where no reflection can be expected at all.
[0032]
The selection of the mode (beam setting pattern) is not limited to the above-mentioned preferable
conditions, and it is possible to freely select it according to the preference of the user regardless
of what content is reproduced in any use environment. Of course.
[0033]
FIG. 5 is a block diagram of the multi-channel audio system.
The audio system comprises an array speaker 1 and a circuit unit 2. The array speaker 1 is an
arrangement of speaker units as shown in FIG. 1, and is housed in a housing (speaker box). The
circuit unit 2 may be housed in the housing integrally with the array speaker 1 or may be
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separate.
[0034]
The circuit unit 2 includes a control unit 10, a pattern memory 11, a decoder 13, a signal
processing unit 14, an amplifier 16, and a user interface 17. The decoder 13 is connected to the
digital audio input terminal 12 and decodes the digital audio data input from the digital audio
input terminal 12 into a multi-channel audio signal. In this embodiment, the audio signal of five
channels is decoded. The decoded five channel audio signals (center C, front left FL, front right
FR, surround left SL, and surround right SR) are input to the signal processing unit 14. Note that
depending on the playback mode, the audio signal of center C, surround left SL, and surround
right SR is downmixed and output to front left FL and front right FR.
[0035]
The signal processing unit 14 has signal processing units 14FL, 14FR, 14SL, 14SR, 14C for each
audio channel and an adder 24 for each speaker unit. The signal processing unit for each audio
channel includes an adjustment unit (ADJ) 22 and a directivity control unit (Dirc) 23. The signal
processing unit 14 is configured by a DSP, and each functional unit is configured by a
microprogram.
[0036]
The adjustment unit 22 is a functional unit that compensates for the change in volume and sound
quality of the audio signal of each channel output from the decoder 13 due to the path length
and the number of reflections of each beam. The adjustment unit 22 includes a gain coefficient
multiplier, an equalizer, and a delay unit. A gain factor multiplier multiplies the audio signal by a
gain factor to compensate for attenuation due to distance or number of reflections for the beam
to reach the listener. The equalizer adjusts the gain for each frequency band in order to
compensate for the frequency characteristic of the speaker unit itself of the array speaker 1 and
the attenuation of the high band due to the reflection on the wall surface. The delay unit is a
functional unit that delays in accordance with the distance of each beam (including direct sound)
to the listener in order to compensate for the difference in arrival time to the listener due to the
difference in beam path length.
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[0037]
The directivity control unit 23 is a functional unit that controls timing of outputting an audio
signal to each speaker unit in order to output the beam as a beam directed to a predetermined
focal point. This functional unit is realized, for example, by providing an output tap for each
speaker unit in the shift register.
[0038]
The audio signal for each speaker unit output from the directivity control unit 23 is synthesized
for each speaker unit by the adder 24, converted into an analog signal by the D / A converter 15,
and then input to the power amplifier 16. . The power amplifier 16 amplifies this audio signal
and inputs it to each speaker unit of the array speaker 1. The speaker unit emits this audio signal
as air vibration.
[0039]
The control unit 10 controls the signal processing unit 14 based on the beam control data stored
in the memory 11 and the pattern table (see FIG. 4).
[0040]
The control unit 10 reads the beam setting pattern of the reproduction mode corresponding to
the reproduction mode instructed by the user (listener) via the user interface 17 and determines
beam control data to be set in the signal processing unit of each channel. .
[0041]
The control unit 10 reads the beam control data from the memory 11, and sets the adjustment
unit 22 and the directivity control unit 23 of each channel to predetermined functions based on
the beam control data.
That is, predetermined parameters are set in the gain coefficient multiplier, the equalizer, and the
delay unit of the adjustment unit 22, and an output tap according to the beam direction and the
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focal distance is set in the directivity control unit 23.
[0042]
The user interface 17 includes an infrared remote control device, and the infrared remote control
device has button switches (reproduction mode selection buttons) for selecting the respective
reproduction modes.
When the user presses any playback mode selection button, the operation information is
transmitted to the control unit 10, and the control unit 10 switches the beam setting pattern
immediately (even during playback of the content). In the above embodiment, when audio signals
of a plurality of channels are reproduced with the same beam setting (for example, the front left
channel FL and the surround left channel SL in mode 3 (see FIG. 3C)) The beam control data of
(1) is set in the signal processing unit of the other channel, but the audio signal of the other
channel may be downmixed to the audio signal of one channel.
[0043]
In addition, when the type and genre of the reproduction content can be acquired, the
reproduction mode may be automatically selected accordingly.
[0044]
The figure which shows the structure of the array speaker used for the multi-channel audio
system which is embodiment of this invention The figure which illustrates the principle of
beaming of the audio signal using an array speaker The beam setting pattern of the audio signal
in the same multi-channel audio system Figure showing a pattern table storing the beam setting
patterns of the figures to be explained A block diagram of the same multi-channel audio system
Explanation of sign
[0045]
DESCRIPTION OF SYMBOLS 1 ... Array speaker 2 ... Circuit part 10 ... Control part 11 ... Memory
14 ... Signal processing part 17 ... User interface 22 ... Adjustment part 23 ... Beam control part 24
... Adder
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