JPH10243499A - Multi-channel reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a natural moving sense of sound depending on the arrangement of speakers and a distance between the speakers by varying an input signal level to two or more speakers adjacent to a concerned speaker at a multiplier section and adding outputs from the multiplier section to an input signal to the concerned speaker. SOLUTION: A reproduction separation adjustment section 201 uses a plurality of multiplier sections and a plurality of adder sections to attenuate audio signal levels of a plurality of speakers adjacent to a concerned speaker and to synthesize an audio signal given to the concerned speaker and the attenuated audio signals and provides the synthesized signal to the concerned speaker, from which an output is obtained. A CPU 106 controls the attenuation of the audio signal levels of a plurality of the speaker adjacent to the concerned speaker by referencing an optimum reproduction separation value stored in a memory 105 based on the arrangement of the speakers of each channel and the distance between the speakers of each channel. The control of the reproduction separation adjustment section 201 by the CPU 106 is set according to the multi-channel reproduction method for audio signals to be read out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-channel reproducing apparatus for reproducing a multi-channel audio signal.

[0002]

2. Description of the Related Art Conventionally, there is a laser disk (LD: Laser Disk) reproducing apparatus for enjoying a movie. 2. Description of the Related Art An audio system using an LD playback device generally displays an image on a television, outputs audio signals such as music from two speakers in stereo, and obtains a sense of widening between left and right. However, recently, in order to add three-dimensional back and forth movement to the video and obtain a sense of reality closer to the theater, audio signals corresponding to each speaker are output from three or more speakers arranged around the listening point. There is a multi-channel playback method.

[0003] The sense of realism obtained by the multi-channel reproduction method is based on the sound source, speaker installation state, room size,
It changes greatly depending on various environments including reproduction equipment. Among them, when n speakers are installed for multi-channel playback, the distance between each speaker and the sound leakage (reproduction separation) of the adjacent speakers affect the sound's sense of localization, movement, and presence. I do. If a plurality of speakers are arranged and there is no sound leakage, that is, if the reproduction separation is too good, the sound will be heard only from the position of the speakers, and the sense of localization, movement, and presence of the sound will not be heard naturally. On the other hand, in the case of the optimal reproduction separation, a natural sound localization feeling, a feeling of movement, and a sense of realism can be obtained.

[0004] The audio signal encoding method in the multi-channel reproduction method includes a two-channel analog audio signal mixed with a phase-changed audio signal to produce a four-channel audio signal, and a Dolby AC-signal. Various encoding methods have been proposed, such as an encoding method of recording digital audio signals of a plurality of channels by reducing the amount of information by compressing a digital signal, such as No.3. Some of these encoding methods change the reproduction separation of each channel by changing a constant, but most of them are determined at the time of encoding.

FIG. 9 is a schematic diagram for explaining reproduction separation in a conventional multi-channel reproduction device. The circles around each speaker shown in FIG. 9 indicate the radiation sound field of the sound output from each speaker. Here, a range in which sound output from the speaker at a certain volume propagates for a predetermined time is defined as a radiation sound field. When sound is output from the loudspeaker, the range over which the sound propagates with the passage of time expands, and the level gradually decreases, and the level becomes 0 at the circumference shown in FIG. The left channel is Lch, the right channel is Rch, the center channel is Cch, the left channel for surround is SLch, the right channel for surround is SRch, and the audio signal of each channel is output from each corresponding speaker.

For example, in a scene in which a helicopter moves from the left side to the right side of the screen, the sound of the helicopter moves from the front left side of the viewer to the center and the front right side,
The picture and sound move in conjunction. In other words, the radiated sound field of the sound output from each speaker intersects the radiated sound field of the sound of the adjacent speaker, and if the portion where the radiated sound field intersects is the optimal reproduction separation for the speaker arrangement, the sound is continuous A natural feeling of movement.

[0007] For example, a sense of movement of sound when the sound moves from the Lch speaker to the Cch speaker will be described.
The sound moves from the Lch speaker to the Cch speaker, and the level of the sound from the Lch speaker gradually decreases. The sound is gradually output from the Cch speaker before the sound from the Lch speaker attenuates and the signal level becomes 0. When the signal level of the sound from the Lch speaker becomes 0, the sound is output from the Cch speaker to the Lch speaker. The sound is output at the set signal level.

That is, the level of the sound output from the Lch speaker or the Cch speaker changes with time, but the level of the sound moved from the Lch speaker to the Cch speaker is constant between the Lch speaker and the Cch speaker. In other words, the sound moves from the Lch speaker to the Cch speaker and can be heard, so that a natural sound movement can be obtained. In other words, in the multi-channel reproduction method, the radiated sound field of the audio signal of each channel is set so that the optimal separation is obtained.
The speakers are arranged so as to intersect the radiated sound field of the adjacent speakers, giving a natural feeling of movement.

[0009]

However, some audio devices, such as AV amplifiers, receive various signals having different reproduction methods. For this reason, LD
And digital versatile discs (DVD: Digita
l When the AV amplifier selects an AC-3 encoded signal such as a Versatile Disk, and operates its decoding circuit, the reproduction separation between the channels is automatically set to the separation level for the AC-3 encoded signal. Become. Next, when a signal encoded by another compression method is input, the signal is switched to a decoding circuit dedicated to that signal.
The separation level is different from the separation level for the C-3 encoded signal. In other words, the user
There is a disadvantage that the reproduction separation needs to be reset every time the multi-channel reproduction method is switched.

[0010] Even when the reproduction separation is set in accordance with various multi-channel reproduction methods, a natural feeling of movement of sound may not be obtained. FIG.
FIG. 3 is a schematic diagram for explaining a reproduction separation when a distance between speakers is large in a conventional multi-channel reproduction device. In FIG. 10, when the speakers of each channel are arranged at a distance, the radiated sound field of each speaker does not overlap with the radiated sound field of an adjacent speaker. The sound is interrupted. For example, the sound of the helicopter emitted from the Lch speaker is gradually attenuated and heard until a predetermined time, and after the predetermined time, the sound suddenly moves to the center Cch speaker and is heard, and the sense of movement of the sound is not good. The disadvantage was that it sounded natural.

[0011] An object of the present invention is to provide a multi-channel reproduction method in which, when a plurality of speakers are arranged around a listening point, even if audio signals corresponding to different multi-channel reproduction methods are switched, the arrangement of the speakers and the distance between the speakers are limited. Accordingly, it is an object of the present invention to provide a multi-channel reproducing device that can obtain a natural sound movement sensation.

[0012]

According to the first aspect of the present invention, there is provided a multi-unit capable of reproducing an audio signal of at least three channels input to at least three or more speakers arranged around a listening point. A multiplying unit for varying a signal level of an audio signal input to at least two or more speakers adjacent to a predetermined speaker among audio signals of three or more channels in the channel reproducing device;
It is characterized by including an adder for adding the audio signal input to the speaker and the audio signal input to the predetermined speaker.

In the present invention according to claim 2,
In a multi-channel reproduction device capable of reproducing three-channel audio signals input to three speakers arranged around a listening point, at least one speaker adjacent to a predetermined speaker among three-channel audio signals A first multiplier for varying a signal level of an input audio signal, and a second multiplier for varying a signal level of an audio signal input to at least two speakers adjacent to a predetermined speaker among three-channel audio signals A first adder for adding an audio signal input to at least one speaker from the first multiplier and an audio signal input to the predetermined speaker; and an input to at least two speakers from the second multiplier. Audio signal and audio input to a predetermined speaker It is characterized by comprising a second adder for adding the issue.

Further, in the present invention according to claim 3,
In a multi-channel reproducing apparatus capable of reproducing an audio signal of at least three channels input to at least three or more speakers arranged around a listening point, a multi-channel audio signal of three or more channels is input to a predetermined speaker. A multiplying unit for varying the signal level of the audio signal to be inputted and the signal level of the audio signal inputted to at least two or more speakers adjacent to the predetermined speaker, and the signal level inputted to at least three or more speakers from the multiplying unit is varied. And an adder for adding the audio signal.

Further, in the present invention described in claim 4,
In a multi-channel reproducing apparatus capable of reproducing a three-channel audio signal input to three speakers arranged around a listening point, an audio signal input to a predetermined speaker and a predetermined A first multiplying unit that varies a signal level of an audio signal input to one speaker adjacent to the speaker; and an audio signal input to another predetermined speaker and an adjacent one of the three predetermined channels among the three-channel audio signals. A second multiplying unit that varies a signal level of an audio signal input to two matching speakers;
A first adder that adds an audio signal input to one speaker from the first multiplier to an audio signal input to another predetermined speaker, and audio input to two speakers from the second multiplier A second addition unit that adds the signal and an audio signal input to another predetermined speaker.

Further, in the present invention described in claim 5,
In the multi-channel reproduction device according to the first or third aspect, the multiplying unit varies the signal level of the audio signal based on the arrangement of the plurality of speakers and the distance between the plurality of speakers.

Further, in the present invention described in claim 6,
5. The multi-channel reproducing apparatus according to claim 2, wherein the first multiplier and the second multiplier change a signal level of the audio signal based on an arrangement of a plurality of speakers and a distance between the plurality of speakers. And

According to the present invention, in a multi-channel reproducing apparatus capable of reproducing an audio signal output from each of a plurality of speakers arranged around a listening point, an audio signal input to a predetermined speaker is To attenuate the signal level of an audio signal input to another adjacent speaker, add the audio signal of the predetermined speaker and the attenuated audio signal of the other speaker, and output the signal from the predetermined speaker. Irrespective of this, even when the distance between the speakers is large, a natural feeling of movement of sound can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a schematic configuration of one embodiment of a multi-channel reproducing apparatus according to the present invention. The multi-channel playback device shown in FIG. 1 performs, for example, decoding processing, adjustment of playback separation, addition of reverberation sound, and the like to an audio signal from an external playback device such as an LD player or a DVD player.
The audio signal is amplified and output from speakers of each channel. Multi-channel playback device
A / D converter 101, selector 102, external input unit 10
3. Digital signal processing unit 104, memory 105, CPU
106, a D / A converter 107, and an amplifier 108.

The amplifier 108 of the multi-channel reproducing apparatus
Is connected to a speaker 109 for each channel. In the present embodiment, five speakers 109 for outputting five-channel audio signals are connected,
Each speaker 109 is arranged around the listening point. The five-channel audio signal is output from the front left (Lch) speaker 109.
a, front center (Cch) speaker 109b, front right (Rch) speaker 109c, rear left surround (S
Lch) speaker 109d, rear right surround (SR
ch) Speaker 109e. Here, in the case of a 5.1-channel audio signal, an audio signal to a low-frequency dedicated (SWch) speaker corresponding to a 0.1-channel audio signal is added to the 5-channel audio signal.

The A / D converter 101 converts an audio signal input as an analog signal into a digital signal among a plurality of playback devices connected to the multi-channel playback device. In the case of a digital audio signal, the selector 102 directly passes through the A / D converter 101 without passing through the A / D converter 101.
Is input to

A video player and an audio player such as an LD player are connected to the selector 102, and an audio signal input from each player is transmitted to each speaker according to an instruction input from the external input unit 103. 1
09 to select an audio signal to be input.

The external input unit 103 determines which of the plurality of playback devices connected to the multi-channel playback device outputs an audio signal from the speaker 109, adjusts the playback separation, and controls This is for making additional settings such as reverberation to obtain a sound effect such as feeling. The user can make various settings for the audio signal output from each speaker 109 through the external input unit 103.

The digital signal processing unit 104 includes a selector 1
The audio signal selected in 02 is separated into audio signals for each channel, and the reproduction separation of the audio signal for each channel is adjusted, and processing for adding reverberation and the like is performed.

The memory 105 stores an optimum reproduction separation value based on the arrangement of the speakers 109 and the distance between the speakers.

The CPU 106 controls the selection of an audio signal from an external reproduction device in the selector 102 based on an input from the user to the external input unit 103, the adjustment of the reproduction separation in the digital signal processing unit 104, and the reverberation. It controls the addition of sound and the like.
To adjust the reproduction separation of the digital signal processing unit 104, the reproduction separation value stored in the memory 105 is referred to.

The D / A converter 107 converts the digital audio signal output from the digital signal processor 104 into an analog audio signal and outputs it.

The amplifier 108 amplifies the signal level of the analog audio signal output from the D / A converter 107 and outputs the amplified signal to the speaker 109 of each channel.

The processing operation of the multi-channel playback device will be described. An analog audio signal input from each playback device is input to the A / D converter 101, converted into a digital audio signal, and output to the selector 102. Here, when the audio signal input from the external playback device is a digital signal, it is input to the selector 102 as it is.

When the user selects an audio signal of the external reproduction apparatus to be output from the external input unit 103 to the speaker 109, the CPU 106 controls the selector 102 to select the input audio signal, and selects the selected external reproduction apparatus. Is output to the digital signal processing unit 104.

The audio signal of the selected external reproduction device is input to the digital signal processing unit 104. The user selects a multi-channel playback method corresponding to the audio signal of the selected external playback device. The multi-channel playback method is, for example, a playback method in which a 5-channel audio signal is output from each speaker, or after delaying the audio signal of another channel with respect to the audio signal of a predetermined channel or shifting the phase, , And a reproduction method of combining the output with a predetermined channel and outputting the combined signal.

The CPU 106 selects a decoding process based on the multi-channel reproduction method selected by the user,
The digital signal processing unit 104 performs an audio signal decoding process based on the selected decoding process. Also,
When the user sets processing such as adjustment of reproduction separation and addition of reverberation to an audio signal output from the speaker 109, the processing is also performed under the control of the CPU 106 and output.

The audio signal output from the digital signal processor 104 is converted to an analog signal by the D / A converter 107 and output to the amplifier 108. Amplifier 108
After amplifying the signal level of the audio signal of each channel, the signal is output to each speaker 109.

Here, the adjustment of the reproduction separation of the audio signal in the digital signal processing section 104 will be described with reference to FIGS. 1, 2 and 3. FIG. FIG. 2 is a schematic diagram showing a schematic configuration of one embodiment of the reproduction separation adjusting unit in the multi-channel reproduction device of the present invention. FIG. 3 is a schematic diagram illustrating a schematic configuration of a speaker arrangement in the multi-channel playback device of the present embodiment. The digital signal processing unit 104 includes a reproduction separation adjustment unit 201 that adjusts the reproduction separation of the audio signal of each channel.

In FIG. 2, the reproduction separation adjustment unit 201 includes a plurality of multiplication units 202 and a plurality of addition units 203.
After attenuating the signal levels of the audio signals of a plurality of speakers adjacent to the predetermined speaker, the audio signal of the predetermined speaker and the attenuated audio signal are combined and output from the predetermined speaker.

The multiplying section 202 attenuates the signal level of the audio signal. The adder 203 adds the audio signal of the predetermined channel and the audio signal of the speaker adjacent to the speaker that outputs the audio signal of the predetermined channel, which has been processed by the multiplier 202.

In the reproduction separation adjusting section 201, audio signals of a plurality of speakers adjacent to the predetermined speaker are combined with audio signals of the predetermined speaker and output. The control of the attenuation amount of the audio signal level of a plurality of speakers adjacent to the predetermined speaker is performed based on the arrangement of the speakers of each channel and the optimum reproduction separation value stored in the memory 105 based on the distance between the speakers of each channel. The CPU 106 controls with reference to this. CPU
The control of the reproduction separation adjustment unit 201 in 106 is set by a multi-channel reproduction method of an audio signal read from a disk or the like.

In FIG. 3, for example, the audio signal output from the Lch speaker is obtained by attenuating the audio signal levels of the Cch speaker and the SLch speaker adjacent to the Lch speaker by a predetermined amount and adding the resulting signal to the Lch audio signal.

That is, the multiplication unit 2 of the Lch audio signal
A1 and a2 for the multiplication coefficient 02a, b1 and b2 for the multiplication section 202b of the Cch audio signal, and Rch
When the multiplication coefficients of the audio signal multiplication unit 202c are c1 and c2, the multiplication coefficients of the SLch audio signal multiplication unit 202d are d1 and d2, and the multiplication coefficients of the SRch audio signal multiplication unit 202e are e1 and e2, Lch
The audio signal input to the speaker is as follows: L = L + C × b1 + SL × d1 (1)

Similarly, the audio signals input to the Cch speaker, Rch speaker, SLch speaker, and SRch speaker are as follows: C = C + L × a1 + R × c1 (2) R = R + C × b2 + SR × e1 (3) SL = SL + L × a2 + SR × e2 (4) SR = SR + R × c2 + SL × d2 (5) That is, the reproduction separation between the channels can be adjusted by changing the respective multiplication coefficients.

In this embodiment, since the low-frequency audio signal has a small sense of localization and a sense of movement, the reproduction separation adjustment is omitted. May be added.

The setting of the multiplication coefficient in the multiplication unit 202 in the above-described processing will be described with reference to FIG.
It is assumed that the user uses the external input unit 103 to input speaker configuration information such as the arrangement of the speakers 109 connected to the multi-channel playback device and the distance between the speakers 109.

When the speaker configuration information is input from the external input unit 103, the CPU 106 determines the optimum reproduction separation value based on the speaker configuration stored in the memory 105 from the arrangement of the speaker 109 in the speaker configuration information. With reference to this, the first reproduction separation value is determined.

The CPU 106 refers to the optimum reproduction separation value based on the distance between the speakers, which is stored in the memory 105, based on the distance between the speakers 109 in the speaker configuration information. Confirm.

Then, a corrected reproduction separation value is obtained from the first reproduction separation value and the second reproduction separation value. Corrected reproduction separation value = first reproduction separation value−second reproduction separation value (6)

The CPU 106 inputs a multiplication coefficient corresponding to the obtained corrected reproduction separation value to the multiplication unit 202. The multiplication unit 202 attenuates the signal level of the input audio signal based on the multiplication coefficient from the CPU 106, adds the signal level to the audio signal of each channel, and outputs the result. By this processing, the reproduction separation of the audio signal of each channel is adjusted.

Here, in the present embodiment, the multiplication coefficient is automatically determined by the CPU 106 based on the information stored in the memory 105. , Medium, small, and so on, and a multiplication coefficient that provides a natural feeling of movement while listening to the sound may be selected and changed.

FIG. 4 is a schematic diagram for explaining reproduction separation adjustment in the multi-channel reproduction device of the present invention. As described above, for example, the Cch audio signal whose signal level is attenuated to the Lch audio signal and S
By adding the Lch audio signal and adjusting the reproduction separation of the audio signal of each channel, as shown in FIG. 4, even when the distance between the speakers is large, the radiated sound field of the sound output from each speaker can be obtained. Since the sound field overlaps with the radiated sound field of the sound of the adjacent speakers, the sound field between the speakers expands. In other words, the reproduction separation of the audio signal of each channel is the optimal reproduction separation corresponding to the arrangement of the speakers of each channel and the distance between the speakers. Even if the distance between the speakers is large and the volume is low, natural sound Feeling of movement can be obtained.

Here, an audio signal obtained by attenuating the signal level of another channel is added to the audio signal of the predetermined channel. However, if the signal level of the audio signal of the predetermined channel is large, an overflow may occur. For this purpose, the audio signal of a predetermined channel may be attenuated and added to the attenuated audio signal of another channel.

An embodiment in which the signal levels of an audio signal of a predetermined channel and an audio signal of another channel can be adjusted will be described. FIG. 5 is a schematic diagram showing another embodiment of the separation adjustment unit in the multi-channel playback device of the present invention. (A) shows a speaker arrangement, and (b) shows a configuration of a multiplication unit and an addition unit. FIG.
In the case of the speaker arrangement shown in (a), for example, in the case of an Lch audio signal, as shown in FIG. 5B, an Lch audio signal is applied to a multiplier of a multiplication coefficient a3, and a Cch audio signal is assigned to a multiplier of a multiplication coefficient b1. , The SLch audio signal is input to the multiplication unit of the multiplication coefficient d1, and the three audio signals from each multiplication unit are added by the Lch addition unit. Thus, the Lch audio signal input to the Lch speaker is as follows: L = L × a3 + C × b1 + SL × d1 (7)

Similarly, the audio signal of each channel is as follows: C = C × b3 + L × a1 + R × c1 (8) R = R × c3 + C × b2 + SR × e1 (9) SL = SL × d3 + L × a2 + SR × e2 (10) SR = SR x e3 + R x c2 + SL x d2 (11)

As described above, according to this embodiment, when the reproduction separation is adjusted, the audio signal level of a predetermined channel can be attenuated and added to the audio signal of another channel whose signal level has been attenuated. Even when the predetermined channel signal is at a large level, an overflow does not occur, and an optimal feeling of movement can be obtained.

Next, another embodiment of the multi-channel reproducing apparatus of the present invention will be described. FIG. 6 is a schematic diagram showing a schematic configuration when reproducing a 4-channel audio signal in the multi-channel reproducing apparatus of the present invention.
(A) shows a speaker arrangement, and (b) shows a configuration of a multiplication unit and an addition unit. In the case of the speaker arrangement shown in FIG. 6A, that is, when reproducing the Lch, Cch, Rch and 4-channel audio signals of the rear surround (Sch), the multiplication unit and the addition unit shown in FIG. According to the configuration, the audio signal input to the speaker of each channel is as follows: L = L + C × b1 + S × d1 (12) C = C + L × a1 + R × c1 (13) R = R + C × b2 + S × d2 (14) S = S + R × c2 + L × a2 (15)

FIG. 7 is a schematic diagram showing a schematic configuration when reproducing a 3ch audio signal in the multi-channel reproducing apparatus of the present invention. (A) shows a speaker arrangement, and (b) shows a configuration of a multiplication unit and an addition unit. FIG.
In the case of the speaker arrangement shown in FIG.
When reproducing the audio signals of 3ch of h, Cch, and Rch, the audio signal input to the speaker of each channel is L = L + C × b1 (16) by the configuration of the multiplication unit and the addition unit shown in FIG. ) C = C + L × a1 + R × c1 (17) R = R + C × b2 (18) In the present embodiment, an optimal feeling of movement is obtained on the left and right.

FIG. 8 is a schematic diagram showing a schematic configuration when reproducing a 3ch audio signal in the multi-channel reproducing apparatus of the present invention. (A) shows a speaker arrangement, and (b) shows a configuration of a multiplication unit and an addition unit. FIG.
In the case of the speaker arrangement shown in FIG.
When reproducing audio signals of three channels of h, Rch, and Sch, the audio signals input to the speakers of each channel are L = L + R × c2 + S × b1 by the configuration of the multiplication unit and the addition unit shown in FIG. (19) R = R + L × a2 + S × b2 (20) S = S + L × a1 + R × c1 (21) In the present embodiment, an optimal movement feeling can be obtained in front, rear, left and right.

[0056]

According to the present invention, in a multi-channel reproducing apparatus capable of obtaining an audio signal corresponding to each speaker from a plurality of speakers to obtain a sense of realism, an audio signal corresponding to a different multi-channel reproducing method is provided. Even in this case, a natural feeling of movement of sound can be obtained according to the arrangement of the speakers or the distance between the speakers.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of one embodiment of a multi-channel playback device of the present invention.

FIG. 2 is a schematic diagram illustrating a schematic configuration of an embodiment of a reproduction separation adjustment unit in the multi-channel reproduction device of the present invention.

FIG. 3 is a schematic diagram showing a schematic configuration of a speaker arrangement in the multi-channel playback device of the embodiment.

FIG. 4 is a schematic diagram for explaining reproduction separation adjustment in the multi-channel reproduction device of the present invention.

FIG. 5 is a schematic diagram showing another embodiment of the separation adjustment unit in the multi-channel playback device of the present invention.
(A) shows a speaker arrangement, and (b) shows a configuration of a multiplication unit and an addition unit.

FIG. 6 shows 4 in the multi-channel reproducing apparatus of the present invention.
FIG. 3 is a schematic diagram showing a schematic configuration when reproducing an audio signal of a channel. (A) shows an arrangement of speakers, and (b)
Indicates the configuration of the multiplication unit and the addition unit.

FIG. 7 shows 3 in the multi-channel playback device of the present invention.
FIG. 3 is a schematic diagram showing a schematic configuration when reproducing an audio signal of a channel. (A) shows an arrangement of speakers, and (b)
Indicates the configuration of the multiplication unit and the addition unit.

FIG. 8 shows a multi-channel playback device according to the present invention;
FIG. 3 is a schematic diagram showing a schematic configuration when reproducing an audio signal of a channel. (A) shows an arrangement of speakers, and (b)
Indicates the configuration of the multiplication unit and the addition unit.

FIG. 9 is a schematic diagram for explaining reproduction separation in a conventional multi-channel reproduction device.

FIG. 10 is a schematic diagram for describing a reproduction separation when a distance between speakers is large in a conventional multi-channel reproduction device.

[Explanation of symbols]

 Reference Signs List 101 A / D conversion unit 102 Selector 103 External input unit 104 Digital signal processing unit 105 Memory 106 CPU 107 D / A conversion unit 108 Amplifier 109 Speaker 201 Reproduction separation adjustment unit 202 Multiplication unit 203 ... adder

Claims (6)

[Claims] 1. A multi-channel reproducing apparatus capable of reproducing an audio signal of at least three channels input to at least three or more speakers arranged around a listening point. A multiplying unit that varies a signal level of an audio signal input to at least two or more speakers adjacent to the speaker; an audio signal input to the at least two or more speakers from the multiplying unit and input to the predetermined speaker A multi-channel playback device comprising: an addition unit that adds an audio signal. 2. A multi-channel reproducing apparatus capable of reproducing a three-channel audio signal input to three speakers arranged around a listening point, wherein at least one of the three-channel audio signals adjacent to a predetermined speaker is reproduced. A first multiplier for varying the signal level of an audio signal input to one speaker;
A second multiplying unit that varies a signal level of an audio signal input to at least two speakers adjacent to a predetermined speaker among audio signals of a channel, and audio input to the at least one speaker from the first multiplying unit A first adding unit for adding a signal and an audio signal input to the predetermined speaker; an audio signal input to the at least two speakers from the second multiplying unit; and an audio signal input to the predetermined speaker. And a second adder for adding the first and second signals. 3. A multi-channel reproducing apparatus capable of reproducing an audio signal of at least three channels input to at least three or more speakers arranged around a listening point. A multiplying unit that varies a signal level of an audio signal input to a speaker and a signal level of an audio signal input to at least two or more speakers adjacent to the predetermined speaker; and a signal input to at least three or more speakers from the multiplying unit. And an adder for adding the audio signal having the variable signal level. 4. A multi-channel reproducing apparatus capable of reproducing a three-channel audio signal inputted to three speakers arranged around a listening point, wherein the three-channel audio signal is inputted to a predetermined speaker. A first multiplying unit for varying a signal level of an audio signal and an audio signal input to one speaker adjacent to the predetermined speaker; an audio signal input to another predetermined speaker among the three-channel audio signals; A second multiplier for varying the signal level of audio signals input to two speakers adjacent to the predetermined speaker, an audio signal input to the one speaker from the first multiplier, and the other predetermined speaker A first adder for adding an audio signal input to the second multiplication unit and the second multiplication unit That it comprises a second adder for adding the audio signal inputted to a given speaker the two loudspeakers is an audio signal and the other is input to the from the multi-channel reproduction apparatus according to claim. 5. The multi-channel reproducing apparatus according to claim 1, wherein said multiplying unit varies a signal level of said audio signal based on an arrangement of said plurality of speakers and a distance between said plurality of speakers. A multi-channel reproduction device characterized by the above-mentioned. 6. The multi-channel reproducing apparatus according to claim 2, wherein said first multiplying unit and said second multiplying unit adjust the signal level of said audio signal between the arrangement of said plurality of speakers and said plurality of speakers. A multi-channel playback device that varies based on the distance between the two.