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JP2005064746

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005064746
A speaker and an audio reproducing apparatus capable of realizing a multi-channel audio system
with a simple configuration. A position where a virtual sound source using a fan-shaped sound
beam of a speaker array and reflection by a wall surface of a room is listened to by using a
speaker array in which a plurality of speakers are arranged in a line and combining their
arrangement and structure diagonally Produce around. Further, by creating a phantom (virtual
image) between the virtual sound sources, even with limited directivity control of the line speaker
array, setting freedom of virtual sound source positions like a panel speaker array is realized.
[Selected figure] Figure 9
Audio reproducing apparatus, line array speaker unit and audio reproducing method
[0001]
The present invention relates to an audio reproduction device suitable for reproducing multichannel audio in combination with a display such as a television, a line array speaker unit, and an
audio reproduction method.
[0002]
In recent years, home theater devices that can enjoy the cinema's realism at home have gained
popularity.
A home home theater apparatus generally has a plurality of speakers installed so as to surround
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a listening position, as typified by 5.1 channel surround. However, such a multi-speaker surround
system requires complicated wiring, troublesome arrangement, and a large space for securing
the installation location, and is a system friendly for people who want to enjoy multi-channel
audio easily. I could not say that.
[0003]
Therefore, there is also a method of artificially reproducing surround sound with a 2-ch speaker
system such as virtual surround, but it has not become mainstream because of unnaturalness,
restriction of listening environment, lack of presence, poor sound quality, and the like.
[0004]
Also, in recent years, a technology has been proposed in which a virtual sound source is formed
at a position surrounding a listener using a panel-type speaker array device (for example, Patent
Document 1 and Non-Patent Documents 1 and 2).
[0005]
The panel-type speaker array device has a structure in which a large number of speakers are
two-dimensionally arranged on a panel plane, and in a surround system using this speaker array
device, the sound output from each speaker is one point in space The virtual sound source can be
formed around the listener by controlling the delay to form a beam to focus on and using the
reflection from the wall of the formed sound beam, thereby the front speaker A surround multichannel audio system is realized with only one.
Special Table 2003-510924 [online] [search on August 6, 2003] Internet <URL:
http://www.pioneer.co.jp/press/release366-j.html> [online] [2008/08 May 6 Search] Internet
<URL: http://www.1limited.com/lib/sound_projector_japanese.pdf>
[0006]
In the surround system using the above-mentioned panel type speaker array device, since the
sound beam can be formed in a free direction in front of the panel, the sound can be localized at
a free position for each channel, but the directivity is sharp. In order to enable beam control, a
very large number (for example, 254) of speakers must be arranged in a two-dimensional
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manner, and an audio circuit is required for each speaker, which makes the system extremely
expensive. It can not but become.
In addition, since the shape of the speaker array becomes a panel, the area is increased, and
there is a problem that the shape and the freedom of installation when combined with the display
are small.
[0007]
Therefore, an object of the present invention is to provide an audio reproduction apparatus
capable of realizing a highly realistic multi-channel audio system while saving space.
[0008]
Another object of the present invention is to realize cost reduction of a speaker array unit used in
the above-described audio reproduction apparatus.
[0009]
Another object of the present invention is to realize a new audio reproduction method using a
fan-shaped sound beam by a line array speaker having limited directivity control.
[0010]
According to the present invention, there are provided a speaker system comprising a plurality of
speakers, and an audio output means for forming a plurality of beams of the audio signal by
supplying the same audio signal to each speaker of the speaker system with a predetermined
delay. Localization control means for controlling the beam direction or the beam intensity such
that a plurality of virtual sound images formed by the plurality of beams form a virtual image
sound source of the audio signal at a predetermined position. .
[0011]
Further, the present invention is characterized in that the speaker system is configured by
combining a plurality of speaker arrays in which the speakers are arranged in a line shape while
changing the direction.
[0012]
The present invention is a speaker unit in which a plurality of speakers are arranged in a
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predetermined direction (left and right), and the plurality of speakers are arranged alternately in
a direction perpendicular to the predetermined direction (up and down or back and forth). Do.
[0013]
The present invention forms a plurality of beams of the audio signal by supplying the same audio
signal with a predetermined delay to each speaker of a speaker system including a plurality of
speakers, and a plurality of beams formed by the plurality of beams The beam direction or the
beam intensity is controlled such that a virtual sound image of the light source forms a virtual
image source of the audio signal at a predetermined position.
[0014]
In the present invention, the speaker system can use a speaker array in which a plurality of
speakers are arranged in a line without using a panel-like speaker array.
By combining the arrangement and structure vertically and horizontally, a virtual sound source is
generated around the listening position using the fan-shaped sound beam of the speaker array
and the reflection from the wall of the room.
Further, by creating a virtual image (phantom) between the virtual sound sources, even with
limited directivity control of the line speaker array, setting freedom of virtual sound source
positions like a panel speaker array is realized.
As a result, even though the number of speakers is small, it is possible to reproduce a free sound
field that wraps around the listening position.
[0015]
Therefore, according to the present invention, by localizing the phantom with the fan-shaped
beam, the weakness of the line array speaker whose directivity is limited can be compensated,
and the sound can be localized at a free position only by the combination of vertical / horizontal
placement. it can.
[0016]
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Further, according to the present invention, the number of speakers used for the panel array
speaker can be reduced, and the cost can be significantly reduced, and the maximum effect can
be obtained with the minimum number of speakers in sound field reproduction.
[0017]
The small total area of the panel and the relatively free form allow for an increase in the freedom
of installation as well as an easy combination with the display.
[0018]
A line array speaker unit according to an embodiment of the present invention and an audio
reproduction apparatus using the line array speaker unit will be described with reference to the
drawings.
[0019]
FIG. 1 is a view showing the structure of a line array speaker unit according to an embodiment of
the present invention.
The line array speaker unit 1 is configured by arranging a plurality (n pieces) of speakers 2 (2-1
to 2-n) in a line shape in an elongated enclosure (casing) 3.
The distance d between the speakers 2 and the length L of the speaker array (speakers arranged
in a line) are set in accordance with the audio frequency band to be beam-controlled.
For example, in the case of controlling the high region, the speaker interval d is shortened, and in
the case of controlling the low region, the enclosure is lengthened so that the length L of the
speaker array is increased.
[0020]
When it is desired to further control the high region or to increase the density of the speakers to
increase the combined output, the speakers are alternately arranged on the two sides of the
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enclosure 3 as shown in FIG. The speaker spacing d can be substantially shortened without
increasing the area.
By arranging the two speakers alternately, the speaker spacing d can be made smaller than the
diameter of the speakers, so that the high region can be controlled better than in the case of one
row, and the output can be more improved. Can also be enlarged.
[0021]
In addition, although a cone type speaker is generally used as each speaker, you may use the
horn type speaker which can anticipate more to raise the radiation efficiency of the sound to the
panel front by providing directivity.
Also, multiple types of speakers of different types and performance may be used together.
[0022]
FIG. 3 is a view showing the shape of a beam formed by the line array speaker unit.
When the same audio signal is input with an appropriate phase difference to each of the
speakers 2-1 to 2-n of the speaker array arranged in a line, as shown in FIG. The wavefront is
narrowed in a beam shape and propagates only in a specific direction.
Also, when a plurality of audio signals are beam-controlled in different directions and combined,
and input to each speaker, the respective audio signals are output as beams in the different
directions.
[0023]
On the other hand, as shown in FIG. 6B, the directivity of the audio signal is not controlled on the
plane perpendicular to the speaker array.
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That is, it propagates with the directivity which each speaker 2 originally has.
[0024]
Therefore, by controlling the beam of the audio signal with the linear speaker array, it is possible
to angularly control a fan-shaped beam extending in the direction perpendicular to the speaker
array in the axial direction of the speaker array.
[0025]
A control method and an audio system for forming a virtual image sound source (phantom) on
the back of a listener using a line array speaker unit capable of forming such a beam will be
described.
[0026]
The phantom is a virtual image of a sound image (sound source) formed using the principle of
sound image localization of two-channel stereo, and is based on the time difference and volume
difference between the sound heard from the right ear and the sound heard from the left ear. It
refers to the phenomenon where the listener feels a sound image in the middle position.
[0027]
On the other hand, as disclosed in the above-mentioned Non-Patent Documents 1 and 2, if an
array speaker is used, a beam can be focused on the wall of a room to form a virtual sound
source on the wall.
In the speaker system of matrix array as shown in Non-Patent Documents 1 and 2, since it is
possible to form a sharply focused beam, it is possible to use the virtual sound source formed on
the wall as it is as a surround sound source. However, in the case of the line array speaker unit of
the present invention, it is difficult to use the virtual sound source formed by this as the surround
sound source as it is because the narrowing of the beam is fan-shaped and broad as described
above.
[0028]
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Therefore, in this embodiment, audio signals of the same channel are beam formed in a plurality
of directions to form a plurality of broad virtual sound sources, and the listener's left and right
ears are made to listen to the audio signals coming from the plurality of virtual sources. Thus, the
phantom is controlled to be formed at a predetermined position.
Then, this phantom is used as a sound source.
[0029]
A plurality of beams of the same channel may be formed by one line array speaker unit, but as
shown in FIG. 4, the direction is changed and a plurality of line array speaker units are combined
and each line array speaker unit is separate. The beam may be formed in the direction.
A more clear phantom can be formed by changing the direction of the plurality of line array
speaker units and combining the plurality of line array speaker units in this manner. In FIG. 4,
FIG. 4A is an example in which two line array speaker units are combined in a T-shape. The
figure (B) is an example which combined two line array speaker units into L form. FIG. 7C is an
example in which three line array speaker units are combined in an inverted U shape on the left
and right and on the top. The figure (D) is an example which combined four line array speaker
units in square shape. The figure (E) is an example which combined two line array speaker units
into X form.
[0030]
Among these, (B), (C) and (D) show an example combined with the display 5. In these examples,
the display and the speaker may be integral or may be combined in different housings.
[0031]
The arrangement shown in FIG. 6B is not symmetrical, but the beam from the vertical speaker
spreads in the horizontal plane, so the sound is not asymmetric.
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[0032]
The arrangement shown in FIG. 6C is the same as that of the front speaker of a normal surround
system, and there is little visual discomfort. In this arrangement, all channels of 5.1 channel
surround audio are beamed. In addition to control and setting of virtual sound sources, only the
surround CH can be beam-controlled, and the front L, R, and C channels can be normally output
separately for each channel using three line array speaker units.
In this case, only the rear surround channel is set as a virtual sound source or phantom.
[0033]
Further, in the configuration of FIG. 6E, two line array speaker units are diagonally disposed in an
X shape. The advantage of this arrangement is that the beam can be controlled in oblique
directions not possible with the vertical and horizontal arrangements. The oblique direction is a
beam path which allows the distance from the listening position to the beam to be the largest,
and the direct / indirect sound ratio can be improved as compared with other arrangement types
because the sound coverage to the listener is small.
[0034]
FIGS. 5, 6, and 7 are diagrams showing trajectories / reflections of beams formed by line array
speaker units installed vertically, horizontally, and diagonally, respectively. FIG. 5 is a view
showing a beam formed by the line array speaker unit installed in the horizontal direction. From
the line array speaker unit installed in the horizontal direction, the horizontal opening angle is
narrowed to form a beam whose direction is controlled. The beam shape is a broad fan in the
vertical direction. In this horizontal installation, beams can be formed that focus on the side walls
and the back wall.
[0035]
FIG. 6 is a view showing beams formed by the line array speaker unit installed in the vertical
direction. From the line array speaker unit installed in the vertical direction, the opening angle in
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the vertical direction is narrowed to form a controlled beam. The beam shape is a broad fan in
the horizontal direction. In this vertical installation, beams can be formed that focus on the
ceiling and back wall.
[0036]
FIG. 7 is a view showing beams formed by the line array speaker unit installed in an oblique
direction. From the line array speaker unit installed in an oblique direction, the opening angle in
the direction perpendicular to the installation direction is narrowed, and a broad oblique beam is
formed in the installation direction. That is, in the figure, in the case of the line array speaker unit
installed from the upper right to the lower left, the opening angle in the direction from the upper
right to the lower left is narrowed and the beam shape becomes broad from the upper left to the
lower right. This beam can focus on the top right corner and back wall of the ceiling.
[0037]
As described above, the beam formed by the line array speaker unit is fan-shaped and broad, so
the focus is not clear, but the virtual sound source is directed to the wall in the direction in which
the sound first reaches the listener by the preceding sound effect (Heath effect) It is possible to
assume. Here, the preceding sound effect is a psychoacoustic property that, when the same
sound arrives from a wide range, the listener feels localization in the direction in which the sound
first arrives in the range. Therefore, a virtual sound source may be assumed on the wall surface
(ceiling plane) in the direction in which the listener first receives a sound, and a phantom may be
formed based on a plurality of virtual sound sources assumed in this manner.
[0038]
In addition, according to the line array speaker unit, since localization is broad as described
above, natural surround reproduction is realized by reducing unnaturalness of the surround
localization being too clear when surround speakers are actually installed. It can also be done.
[0039]
FIGS. 8 and 9 are diagrams for explaining the procedure of forming a plurality of virtual sound
sources by beam formation by the line array speaker unit and forming a phantom by the plurality
of virtual sound sources.
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[0040]
In FIG. 8, beams (1) and (2) represent beams from the horizontally arranged line array speaker
unit, and beams (3) and (4) represent beams from the vertically arranged line array speaker unit.
When the same audio source (channel) is reproduced by beams (1) and (3), by adjusting the
volume balance of them, it is on the straight line connecting the virtual sound sources on the side
wall and the ceiling surface, ie diagonally forward You can create a phantom.
Likewise, combine multiple beams for one audio source, such as side by beam (1) and (2) and
diagonally back at beam (2) and (4), and adjust the volume of each. It is possible to localize the
phantom at a free position.
[0041]
FIGS. 9A to 9D are diagrams showing examples of beam forming for localizing the phantom at
the center, front, side, and rear, respectively. By forming a plurality of (two) broad virtual sound
sources on the wall surface, the listener can aurally recognize the phantom localization at an
approximately intermediate position thereof. The localization position can be controlled at an
arbitrary position by controlling elements such as the direction and volume level of each beam.
[0042]
Next, an audio reproduction apparatus for realizing a phantom localization function using the
line array speaker unit will be described.
[0043]
FIG. 10 is a diagram showing the configuration of the audio reproduction device.
The audio reproducing apparatus includes a decoder 10 for decoding an audio source, a
localization control unit 11 for controlling phantom localization of each channel, and a beam
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control unit 12 for controlling beam direction and level of an audio source for each channel to
realize the localization. And an audio circuit unit 13 for driving the speakers of the line array
speaker unit. When the speaker system is configured by combining a plurality of line array
speaker units (as shown in FIG. 4), a plurality of beam control units 12 and audio circuit units 13
are respectively provided corresponding to the respective line array speaker units.
[0044]
The input audio source is, for example, a 5.1 channel surround digital signal. A decoder 10
separates this signal into digital audio signals of each channel. This digital audio signal is input to
the beam control unit 12. The beam control unit 12 may be configured by a DSP.
[0045]
The localization control unit 11 is constituted by a microcomputer or the like, and to which
position the audio signal of each channel is to be phantom localized, to which position to set the
virtual sound source for the phantom localization, or to set the virtual sound source The beam
control unit is notified of which direction to control the beam and how to set the gain and delay
of the audio signal input to each speaker for this beam formation.
[0046]
FIG. 11 is a diagram showing a functional configuration of the beam control unit 12.
The beam control unit 12 is provided with beam control units 12-1 to 12-6 for 5.1 channels.
Each beam control unit is provided with a delay 120 and n coefficient multiplication units 121
and 122 corresponding to the speakers of the line array speaker unit. The tap position of the
delay 120 and the coefficients of the coefficient multiplying units 121 and 122 are input from
the localization control unit 11. The tap position of the delay 120 determines the beam angle.
The coefficient multiplication unit 121 receives a coefficient for maintaining the balance of the
beam by canceling the deviation of the volume of each speaker due to the delay. Further, a
window function for canceling the side lobe of the beam is input to the coefficient multiplication
unit 122. A Hamming window or a Hanning window may be used as the window function.
[0047]
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The output of the beam control unit of each channel is added for each speaker by the adder 123
and output to the audio circuit unit 13.
[0048]
In FIG. 10, the audio circuit unit 13 includes the number of D / A converters 130 and audio
amplifiers 131 corresponding to the speakers of the line array speaker unit.
The digital audio signal output from the beam control unit 12 to the speaker unit is input to the
D / A converter 130. This digital audio signal is the sum of the audio signals of the respective
channels as described in FIG. The D / A converter 130 converts this digital audio signal into an
analog audio signal and inputs it to the audio amplifier 131. The signal amplified by the audio
amplifier 131 is input to each speaker of the line array speaker unit 1 and is output as sound.
[0049]
The front view of the line array speaker unit which is embodiment of this invention The figure
which shows other embodiment of a line array speaker unit The figure which illustrates the beam
shape which a line array speaker unit forms A combination example of a plurality of line array
speaker units is shown Illustration explaining the reflection state in the room of the beam formed
by the horizontal line array speaker unit Illustration explaining the reflection state in the room of
the beam formed by the vertically arranged line array speaker unit The figure illustrates the
reflection state of the formed beam in the room. The figure illustrates phantom localization by a
plurality of beam shapes. The figure illustrates a phantom localization by a plurality of beam
shapes. A block diagram of an audio reproducing apparatus according to an embodiment of the
present invention Function of beam control unit of audio playback device Click view
Explanation of sign
[0050]
DESCRIPTION OF SYMBOLS 1 ... Line array speaker unit 2 (2-1 to 2-n) ... Speaker 3 ... Enclosure
(casing) 10 ... Decoder 11 ... Localization control part 12 ... Beam control part 12-1-12-6 ... Beam
control unit 13 ... Audio circuit unit 120 ... Delay 121, 122 ... Coefficient multiplication unit 130 ...
D / A converter 131 ... Audio amplifier
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