JP2002084599A - Method and system for reproducing sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a system for reproducing sound of karaoke performance, or the like, in which sound can be reproduced while setting the direction of sound field appropriately with respect to the arrangement of speakers. SOLUTION: Speakers SP1-SP4 and a microphone 16 are arranged in a room 10. Accompaniment sound, surround sound of an accompanist, microphone sound and echo/reverb sound of microphone sound are fed through attenuator groups 20, 24, 28 and 32 to each speaker and delivered therefrom. A sound field direction setting section 40 sets the direction of a microphone from the central position 42a of a space 42 surrounded by speakers as the front direction of the sound field. A control section 44 controls attenuation of the attenuator groups 20, 24, 28 and 32 such that a sound field is formed in a direction set at the sound field direction setting section 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing method and a sound reproducing apparatus applicable to karaoke performances and the like.
The sound reproduction can be performed by appropriately setting the direction (direction) of the sound field with respect to the arrangement of the speakers.

[0002]

2. Description of the Related Art In a conventional karaoke performance, the direction of a sound field formed by reproduced sounds is fixedly determined by the arrangement of speakers.

[0003]

In the karaoke performance on the stage, since the direction of the sound field based on the reproduced sound is set in advance so as to correspond to the direction of the stage, the singer needs to play the karaoke with the sound field. You can sing with a bodily sensation. Also,
The listener can listen to the karaoke performance with a sense of unity of vision and hearing, because the direction of the singer and the direction of the sound field coincide with each other. On the other hand, when singing in a karaoke box or restaurant, etc., when each sings at their own sitting position, depending on the positional relationship between the singer and the speaker, the direction of the singing and the sound field may be different. The direction was so different that it was difficult for the singer to sing and for the listener to be difficult to hear. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a sound reproducing method and a sound reproducing apparatus capable of appropriately setting a direction of a sound field with respect to an arrangement of speakers so that sound can be reproduced. It is.

[0004]

According to a first sound reproducing method of the present invention, three or more speakers are arranged in an appropriate space for sound reproduction, and the speakers are arranged at a center position of a space surrounded by the speakers. The relative direction of the sound field formed by the reproduced sound of the speaker with respect to the speaker arrangement is variably set, and the sound signals of the plurality of channels constituting the three-dimensional sound are converted into the sound field of the set sound field of the reproduced sound. Are assigned to one or more speakers and reproduced. According to this, it is possible to form the sound field of the reproduced sound by the sound signals of the plurality of channels in the direction appropriately set.

[0005] In the first sound reproducing method of the present invention, when the sound signals of the plurality of channels are signals in each direction in a plane, the three or more speakers can be arranged in the plane. . In addition, the allocation amount of the sound signal of one channel to one speaker is determined as the relative direction of the one speaker with respect to the direction of the set sound field approaches the direction specific to the channel of the sound signal. Adjustment may be made in accordance with the relative direction of the speaker with respect to the channel-specific direction of the sound signal with respect to the direction of the set sound field so as to gradually increase and gradually decrease as the distance increases. it can. In addition,
The channel-specific direction of the audio signal is, for example, the left front for the left channel accompaniment sound signal, the right front for the right channel accompaniment sound signal, the front center for the microphone signal, and the front and left channel accompaniment surround. If it is a signal (or front left channel microphone echo reverb sound signal), the left front and front right channel accompaniment surround signal (or front right channel microphone echo reverb sound signal)
If this is the case, the accompaniment surround signal for the front right and rear left channels (or the microphone echo reverb sound signal for the rear left channel) is the accompaniment surround signal for the rear left and rear right channel (or the microphone echo reverb sound for the rear right channel) Signal), it corresponds to the rear right.

The sound signals of the plurality of channels are:
It may include a microphone sound channel and an accompaniment sound channel. Further, the sound signals of the plurality of channels include a microphone sound channel (for example, one channel at the front center (front)) and a plurality of channels (e.g., four front left / right and rear left / right channels) constituting an echo reverb sound of the microphone sound. , Accompaniment sound channel (for example,
Channels), and a plurality of channels (for example, four front left / right and rear left / right channels) constituting the surround sound of the accompaniment sound. Further, when the sound signals of the plurality of channels include a signal collected by a microphone in a space surrounded by the speaker, the position of the microphone from the center position of the space surrounded by the speaker with respect to the speaker arrangement. The direction of the sound field can be set according to the relative direction. In this case, the direction of the position of the microphone from the center position of the space surrounded by the speakers can be set as the direction of the front of the sound field. When the distance between the center position of the space surrounded by the speakers and the position of the microphone is within a predetermined value, regardless of the direction of the position of the microphone, the direction of the sound field is appropriately adjusted with respect to the speaker arrangement. The direction may be a fixed fixed direction. Further, according to the distance between the center position of the space surrounded by the speakers and the position of the microphone, the relative direction of one speaker and the sound signal of one acoustic signal based on the direction of the set sound field are set. The change width or the change rate of the allocation amount of the audio signal to the speaker with respect to the deviation amount from the channel-specific direction is changed, and when the distance is short, the change width or the change rate of the allocation amount is reduced. When the distance is long, the width of change or the rate of change of the assigned amount can be increased.

According to a second sound reproducing method of the present invention, three or more speakers are arranged in an appropriate space for sound reproduction, and formed by a sound reproduced from the speakers at a center position of the space surrounded by the speakers. The direction of the sound field to be set relative to the speaker arrangement is variably set, and the distribution of the reflected sound to be reproduced around the center position with respect to the direction of the sound field is defined as the direction of the sound field. In accordance with the relative direction of each speaker as a reference, a region is divided in the circumferential direction around the center position and assigned to each speaker,
A reflected sound parameter corresponding to the distribution of the reflected sound assigned to each of the speakers is convoluted with a common acoustic signal for reflected sound generation to generate reflected sound signals, and each of the reflected sound signals is generated by a corresponding speaker. By playing from
The reflected sound is reproduced based on the direction of the set sound field. According to this, the sound field of the reflected sound can be formed in an appropriately set direction.

A first sound reproducing apparatus according to the present invention comprises three or more speakers arranged in an appropriate space for sound reproduction and a sound reproduced by the speakers at a center position of the space surrounded by the speakers. Sound field direction setting means for variably setting the relative direction of the sound field to the speaker arrangement, and adjusting the volume of the sound signals of a plurality of channels constituting the stereophonic sound for each of the speakers for each channel. Attenuator group, a mixing circuit that mixes each audio signal whose volume is adjusted by the attenuator group between signals for the same speaker, and an output that supplies the mixed audio signal for each speaker to the corresponding speaker. The path and the volume of the sound signal of one channel for one speaker are set in the set sound field. The relative orientation of the one loudspeaker with respect to the channel-specific direction of the audio signal is gradually increased as approaching the channel-specific direction of the audio signal, and gradually decreasing as the distance increases. A control unit that configures the stereophonic sound based on the direction of the sound field by controlling the amount of attenuation of the attenuator group according to the relative direction of the speaker based on the direction of the set sound field. Is provided. According to this, it is possible to form the sound field of the reproduced sound by the sound signals of the plurality of channels in the direction appropriately set.

In the first sound reproducing apparatus of the present invention, the attenuator group may be constituted by, for example, an electronic (analog or digital) attenuator. Also,
As a method of controlling the attenuator group, for example, a table of the amount of attenuation of the attenuator group according to the relative direction of the speaker with respect to the direction of the set sound field with respect to the direction specific to the channel of each acoustic signal. The corresponding attenuator amount can be read from the table according to the relative direction of the speaker, and the attenuator group can be controlled to the corresponding attenuator amount. Alternatively, as another method, an arithmetic expression of the amount of attenuation of the attenuator group according to the relative direction of the speaker with respect to the direction of the set sound field with respect to the direction unique to the channel of each acoustic signal is determined in advance. The attenuator group can be controlled to a corresponding attenuating amount by calculating the corresponding attenuating amount from the arithmetic expression according to the relative direction of the speaker. The attenuator group can be prepared for each audio signal channel, for example. In addition, the sound field direction setting means can set the direction of the sound field based on, for example, an operation of an operator. Further, when the sound signals of the plurality of channels include a signal collected by a microphone in a space surrounded by the speaker (for example, when configured as a karaoke apparatus), the sound field direction setting means may include the sound field direction setting unit. The direction of the sound field is set according to the relative direction of the position of the microphone from the center position of the space surrounded by the speaker to the position of the speaker based on the operation of instructing the position of the microphone in the space to be surrounded. You can do it. Further, when the sound signals of the plurality of channels include signals picked up by a microphone in a space surrounded by the speaker, the sound field direction setting means may determine a position of the microphone in the space surrounded by the speaker. Based on the detection information, the direction of the sound field can be set according to the relative direction of the position of the microphone from the center position of the space surrounded by the speakers with respect to the speaker arrangement. Further, the direction setting means may set a direction of a position of the microphone from a center position of a space surrounded by the speaker as a direction in front of the sound field. Further, the direction setting means includes:
When the distance between the center position of the space surrounded by the speakers and the position of the microphone is within a predetermined value, the direction of the sound field is appropriately determined for the speaker arrangement regardless of the direction of the position of the microphone. Can be set as a fixed direction. In addition, the control unit is configured to set the direction of the set sound field as a reference in accordance with a distance between a center position of a space surrounded by the speakers and a position of the microphone.
When the change width or the change rate of the volume of the sound signal reproduced by the speaker with respect to the difference between the relative direction of one speaker and the channel-specific direction of one sound signal is changed, and the distance is short, The attenuating amount of the attenuator group can be controlled so that the change width or the change rate of the sound volume is reduced, and when the distance is long, the change width or the change rate of the sound volume is increased.

According to a second sound reproducing apparatus of the present invention, three or more speakers arranged in an appropriate space for sound reproduction and a sound reproduced by the speakers at a center position of the space surrounded by the speakers. Sound field direction setting means for variably setting the direction of the sound field relative to the speaker arrangement, a convolution operation circuit provided for each of the speakers, and the direction based on the direction of the sound field. The distribution of the reflected sound to be reproduced around the center position is divided into regions in the circumferential direction around the center position according to the relative directions of the speakers with respect to the direction of the sound field. A control unit for setting, in each of the convolution operation circuits, a reflected sound parameter corresponding to the distribution of the reflected sound assigned to each speaker, and reproducing the reflected sound based on the direction of the set sound field. It is realized.

[0011]

(Embodiment 1) An embodiment in which the present invention is applied to a karaoke apparatus will be described below. FIG.
Indicates a planar arrangement and a signal system of the speaker. Room 1
The four speakers SP are located at the four corners when viewing the inside of 0 from a plane.
1 to SP4 are arranged toward the center of the room 10. Further, the hand microphone 16 is movably arranged at an arbitrary position in the room 10. The left (L) and right (R) two-channel accompaniment signals reproduced by a source reproducing unit (hard disk device, laser vision disk player, CD player, DVD player, etc.) (not shown) of the karaoke device are accompaniment signal processing. The gain is adjusted by the section 18 and input to the accompaniment signal attenuator group 20. The surround signal generation unit 22 generates four channels of accompaniment sounds of front left (FL), front right (FR), rear left (RL), and rear right (RR) based on the mixing signals of the left and right two channels of accompaniment signals. Generate a surround signal. The contents of the surround parameters used in the surround signal generation unit 22, that is, the reflected sound parameters for generating the surround signal, are set by the surround control data. The surround signal of each channel is input to the surround signal attenuator group 24.

The microphone signal of one channel at the front center (C) collected by the microphone 16 is gain-adjusted by the microphone signal processing unit 26 and input to the microphone signal attenuator group 28. The echo reverb signal generator 30 generates a front left (FL), a front right (FR), and a rear left (R
L), and generates an echo reverb signal of four channels on the rear right (RR). The contents of the echo reverb parameters used in the echo reverb signal generator 30, that is, the reflected sound parameters for the echo reverb signal are set by the echo reverb control data. The echo reverb signal of each channel is input to the echo reverb signal attenuator group 32.

Each attenuator group 20, 24, 28, 32
Represents each speaker SP1 for each input signal channel.
To an electronically controlled (analog or digital) attenuator (e.g., VCA) for each of the speakers SP1 to SP4. The signals whose volume has been adjusted are mixed between signals for the same speaker by a mixing circuit 34, and supplied to the respective speakers SP1 to SP4 via power amplifiers PA1 to PA4 to be sounded.

The sound field direction setting unit 40 includes speakers SP1 to SP1.
The speakers SP1 to SP4 with respect to the planar arrangement of SP4
The relative direction in the plane of the sound field formed by the reproduced sound is set. Here, the speaker SP
Center position 42a of space 42 surrounded by 1 to SP4
The direction around (for example, the position of the center of gravity) is θ ｛θ, and the angle from the center position 42a toward the intermediate position between the speakers SP2 and SP3 is the clockwise angle と す る with the reference direction (0 °) as the reference direction. The relative direction of the position of the microphone 16 with respect to the direction is represented by θ, and the direction of the position of the microphone 16 is set as the direction θ in front of the sound field (see FIG. 6). The control unit 44 controls the attenuator groups 20, 24, 28, 3 according to the direction θ of the front of the sound field set by the sound field direction setting unit 40.
2 to control the sound field of the reproduced sound of the speakers SP1 to SP4 in the space 4 surrounded by the speakers SP1 to SP4.
The front direction is formed in the direction θ set with respect to the center position 42a of the first.

FIG. 2 shows an example of the configuration of the sound field direction setting unit 40. This is to set the direction θ in front of the sound field based on the setting of the microphone position by manual operation. The sound field direction setting unit 40 (microphone position setting unit)
And an operator 48 such as a joystick or a mouse.
And an operation unit 49. The display 46 displays the planar arrangement of the speakers SP1 to SP4 and the microphone 16 in the room 10 of FIG. These speakers SP
The display positions of the microphones 1 to SP4 and the microphone 16 are set by moving the operator 48 on the display 46 by operating the operator 48 so as to match the actual positions of the speakers SP1 to SP4 and the microphone 16 in the room 1. I do. Arithmetic unit 4
9 is a speaker SP1 set on the display 46
Based on the positions of the speakers SP1 to SP4, the center position 42a (for example, the position of the center of gravity) of the space 42 surrounded by the speakers SP1 to SP4 is obtained (if the positions of the speakers SP1 to SP4 are fixed, the coordinates of the center position 42a are calculated). Further, based on the position of the microphone 16 set on the display 46, the position of the microphone 16 with respect to the center position 42a is obtained as an angle θ with respect to a reference direction and a distance D, The angle θ is output as setting information of the front direction of the sound field, and the distance D is output as setting information of the distance of the microphone 16 from the center position 42a.

FIG. 3 shows another example of the configuration of the sound field direction setting unit 40. As shown in FIG. This is to set the direction θ in front of the sound field based on the detection of the microphone position. In the room 10, a transmitter 50 for transmitting a radio frequency signal to an appropriate position such as a wall surface is provided.
Are provided, and ultrasonic sensors (ultrasonic microphones) 51 to 54 are provided for the respective speakers SP1 to SP4. Also,
The microphone 16 has a built-in receiver 55 for receiving a radio frequency signal transmitted from the transmitter 50 and an ultrasonic oscillator 56 for intermittently generating ultrasonic waves in synchronization with a synchronization signal included in the radio frequency. ing.

Sound field direction setting unit 40 (microphone position detection unit)
Is a synchronizing signal generator 58, a transmitting unit 60, and a receiving unit 61
And an operation unit 62. The synchronization signal generator 58 generates a predetermined synchronization signal. The transmitting unit 60 modulates the synchronization signal with a radio frequency signal (carrier) and transmits the modulated signal from the transmitter 50. The microphone 16 receives the radio frequency signal at the receiver 55, demodulates a synchronization signal, and intermittently oscillates an ultrasonic wave from the ultrasonic oscillator 56 in synchronization with the synchronization signal. The ultrasonic waves are received by the ultrasonic sensors 51 to 54, respectively, and the received signals are transmitted to the arithmetic unit 62 via the receiving unit 61.
The arithmetic unit 62 measures a time difference (corresponding to a distance from the microphone 16 to each of the ultrasonic sensors 51 to 54) between the synchronous signal generated from the synchronous signal generator 58 and the received signal of each of the ultrasonic sensors 51 to 54. Then, the position of the microphone 16 (the relative position with respect to the ultrasonic sensors 51 to 54) is calculated based on these measured values.

Space 4 surrounded by speakers SP1 to SP4
The second center position 42a can be obtained, for example, as follows. First, the microphone 16 is arranged at the position of the ultrasonic sensor 51 (speaker SP1) to perform the above-described measurement, and the other speakers SP2, SP3, SP4 from the speaker SP1.
The microphone 16 is moved to the position of the ultrasonic sensor 53 (speaker SP3), and the same measurement is performed.
1) Measure the distances to SP2 and SP4, respectively.
As a result, since the mutual positional relationship between SP1 to SP4 is known, the arrangement of the space 42 surrounded by the speakers SP1 to SP4 is specified, and the center position 42a is determined from the arrangement of the space 42.
(For example, the position of the center of gravity) can be obtained.

The arithmetic unit 62 obtains the center position 42a of the space 42 in advance by, for example, the above-described method, and at the time of an actual karaoke performance, the center position 42a is determined based on the detection information of the position of the microphone 16 that changes every moment. Is determined as an angle θ and a distance D with respect to a reference direction (a direction connecting the center position 42a and an intermediate position between the speakers SP2 and SP3), and the angle θ is used as setting information of the front direction of the sound field. The distance D is output as setting information of the distance of the microphone 16 from the center position 42a. When the distance D is short, even if the position of the microphone 16 slightly moves around the center position 42a, the direction of the sound field changes greatly, which may make it difficult to sing and listen. When the distance D is within a predetermined value, the unit 62 determines a predetermined fixed direction (for example, θ) as sound field direction setting information regardless of the direction of the microphone 16.
= 0 °).

FIG. 4 shows an example of the configuration of the control unit 44 shown in FIG.
Attenuator groups 20, 24, 28, 3
2, each speaker SP1 of the audio signal of each channel
For each attenuator for adjusting the reproduced sound in ~ SP4, a table of the amount of attenuation with respect to the direction θ in front of the sound field is stored. The operation unit 66 is configured to store the data in the memory 64 based on the sound field direction setting information sent from the sound field direction setting unit 40.
The attenuator amount of each attenuator is read out from, and output as a command value. Instead of storing the table of the attenuating amount in the memory 64, an arithmetic expression of the attenuating amount with respect to the front direction θ of the sound field for each attenuator is set in the calculating unit 62, and according to the sound field direction setting information. It is also possible to calculate the attenuated amount from the arithmetic expression and output it as a command value.

The operation unit 66 includes a sound field direction setting unit 40
The attenuator amount command value can be corrected according to the setting information of the microphone distance D sent from the microcomputer. For example, as the microphone distance D becomes shorter (that is, the center position 42
a), the rate of change of the amount of attenuation with respect to the change of the direction θ of the front of the sound field with respect to the microphone sound is reduced (or the width of change of the amount of attenuation is reduced). By increasing the volume, the sound field of the singing sound approaches the center position 42a. As a result, the sound field of the singing sound can be moved not only in the circumferential direction of the center position 42a but also in the radial direction.

FIG. 5 shows a specific example of the acoustic signal system shown in FIG. The accompaniment signals of the left and right channels are adjusted in volume by master volumes 72 and 74 via input amplifiers 68 and 70 in the accompaniment signal processing unit 18 and input to the attenuator group 20 for accompaniment signals. Accompaniment signal attenuator group 20
Indicates the attenuator group ATT for each accompaniment sound channel
1, ATT2. Each attenuator group ATT1,
The ATT2 includes an attenuator for each of the speakers SP1 to SP4.

The left and right channel accompaniment signals are mixed (L + R or LR) by the mixing circuit 76 in the surround signal generation unit 22 to be converted into one channel, and are converted into one channel in each direction (front left, front right, rear left, rear right). ) Convolution operation circuits 78 and 8 in which reflected sound parameters (parameters representing individual reflected sounds and constituted by a combination of delay time data and gain data) for generating reflected sound are set.
0, 82, and 84 are input. Convolution operation circuit 78,
80, 82, and 84 convolve the input signal with the reflected sound parameter to generate and output a reflected sound signal (surround signal of accompaniment sound) in each direction. The generated reflected sound signal is input to the surround signal attenuator group 24. The surround signal attenuator group 24 includes attenuator groups ATT3 to ATTA for each surround signal channel.
TT6 is provided. Each attenuator group ATT3 to ATT
Reference numeral 6 denotes an attenuator for each of the speakers SP1 to SP4.

The microphone signal is volume-adjusted by the microphone master volume 88 via the input amplifier 86 in the microphone signal processing section 26, and the microphone signal attenuator group 2
8 is input. The microphone signal attenuator group 28 includes an attenuator group ATT7 composed of attenuators for the respective speakers SP1 to SP4. In the echo reverb signal generation unit 30, the microphone signal is a reflected sound parameter (representing each reflected sound, for generating an echo reverb sound in each direction (front left, front right, rear left, and rear right).
Convolution operation circuits 92, 9 in which parameters (composed of a combination of delay time data and gain data) are set.
4, 96, 98. Convolution operation circuit 92,
94, 96, and 98 convolve the input signal with the reflected sound parameter to generate and output an echo reverb signal in each direction. The generated echo reverb signal is input to the echo reverb signal attenuator group 32. The echo reverb signal attenuator group 32 includes attenuator groups ATT8 to ATT11 for each echo reverb signal channel. Each of the attenuator groups ATT8 to ATT11 includes an attenuator for each of the speakers SP1 to SP4.

The mixing circuit 43 includes an attenuator group A
The outputs of TT1 to ATT11 are added and synthesized between signals for the same speaker. The output signal of the mixing circuit 34 is supplied to the corresponding speakers SP1 to SP4 via the power amplifiers PA1 to PA4 to generate sound. The attenuator amount of the attenuator groups ATT1 to ATT11 will be described. Here, as shown in FIG.
Accompaniment sound field 101 (sound field with accompaniment sound of two channels on the left and right), with the direction from the center position 42a of the space 42 surrounded by the speakers SP1 to SP4 toward the position of the microphone 16 as the direction in front of the sound field. Sound field 103 (sound field by 4-channel surround sound of accompaniment sound), microphone sound field 105 (sound field by 1-channel microphone sound), echo reverb sound field 107 (sound field by 4-channel echo reverb sound of microphone sound) ) Is formed.

Attenuator group ATT1, ATT for accompaniment sound
FIG. 7 shows a characteristic example of the amount of attenuation for each of the speakers 2 to SP4. According to this, the amount of each attenuate gradually changes in accordance with the direction of the front of the sound field (direction of the microphone position) θ (the sum of the volume in each direction is kept equal). The direction θ is 0 as shown in FIG.
Degrees, the left channel attenuator group ATT1 is
Attenuation amount (gain) for speaker SP2 is 1
Thus, the attenuation amounts for the other speakers SP1, SP3, and SP4 are all adjusted to zero. At this time, the right channel attenuator group ATT2 is connected to the speaker SP3.
Attenuation amount is 1 and other speakers SP1, S
The amount of attenuation for P2 and SP4 is all adjusted to zero. Thereby, as shown in FIG.
2 and SP3, an accompaniment sound field 101 is formed with the direction of θ = 0 degrees in front. As shown in FIG. 8, the lower limit value of the attenuator amount of the attenuator groups ATT1 and ATT2 is set to, for example, the center position 42a of the speaker arrangement space 42.
It can be changed according to the distance D between the microphone and the microphone 16 (the change width or the change rate of the amount of attenuation is changed accordingly). For example, when the distance D is large, the lower limit value is lowered (the change width and the rate of change of the amount of attenuation are increased), and the volume other than the microphone position direction is reduced, so that customers other than singers are When used conservatively and locally, and when the distance D is small, the lower limit value is increased (the width of change and the rate of change of the amount of attenuate are increased), and a usage method that excites the atmosphere as a whole becomes possible. .

Attenuator group A for surround sound of accompaniment sound
FIG. 9 shows a characteristic example of the attenuation amount for each of the speakers TT3 to ATT6 for the speakers SP1 to SP4. According to this, the amount of each attenuate gradually changes according to the direction θ of the front of the sound field (the sum of the volume in each direction is kept equal). For example, the direction θ of the front of the sound field is shown in FIG. 0 as shown
In the case of degree, attenuator group ATT3 for front left channel
Is adjusted so that the attenuation amount for the speaker SP2 is 1 and the attenuation amounts for the other speakers SP1, SP3, and SP4 are all 0. At this time, the attenuator group ATT4 for the front right channel has an attenuating amount of 1 for the speaker SP3 and the other speakers SP1, SP2, SP2.
The amount of attenuation for SP4 is all adjusted to zero.
At this time, the rear left channel attenuator group ATT
Reference numeral 5 indicates that the attenuation amount for the speaker SP1 is 1 and the attenuation amounts for the other speakers SP2, SP3, and SP4 are all adjusted to 0. At this time, the rear right channel attenuator group ATT6 has an attenuating amount of 1 for the speaker SP4 and the other speakers SP1 and SP
2, the amount of attenuation for SP3 is all adjusted to zero. As a result, a surround sound field 103 of accompaniment sound is formed in the entire space 42 surrounded by the speakers as shown in FIG. When the lower limit of the amount of attenuation is changed for the accompaniment sound according to the distance D as shown in FIG. 8, the lower limit of the amount of attenuation for the surround sound can be changed at the same time according to the distance D.

FIG. 10 shows a characteristic example of the attenuation amount for each of the speakers SP1 to SP4 of the microphone signal attenuator group ATT7. According to this, the amount of each attenuate gradually changes in accordance with the direction θ in front of the sound field (the sum of the volume in each direction is kept equal.) For example, the direction θ in front of the sound field is shown in FIG. As shown, in the case of 0 degrees, the attenuator group ATT7 adjusts the attenuating amounts for the speakers SP2 and SP3 to 1 and the attenuating amounts for the other speakers SP1 and SP4 to 0. Thereby, as shown in FIG. 6, a microphone sound field 105 is formed around the microphone 16 with the direction of θ = 0 degrees facing the front. As shown in FIG. 11, the lower limit value of the attenuator amount of the attenuator group ATT7 is set to, for example, the speaker arrangement space 42.
Can be changed in accordance with the distance D between the center position 42a of the microphone 16 and the microphone 16 (the change width or the change rate of the attenuate amount is changed accordingly). For example, when the distance D is large, the lower limit value is lowered (the change width of the attenuate amount and the rate of change increase), and when the distance D is small, the lower limit value is increased (the change width and the change rate of the attenuate amount). Is reduced.), The loudspeakers SP <b> 1 to SP <b> 1 corresponding to the radial movement of the microphone 16 with respect to the center position 42 a.
4 moves in the same direction, and a sense of unity between the position of the singing sound and the localization of the singing sound reproduced from the speakers SP1 to SP4 is obtained.

Attenuator group A for echo / reverb signal
FIG. 12 shows a characteristic example of the attenuation amount for each of the speakers SP1 to SP4 of TT8 to ATT11. According to this, the amount of each attenuator gradually changes according to the direction θ in front of the sound field (the sum of the volume in each direction is kept equal). For example, the direction θ in front of the sound field is shown in FIG. In the case of 0 degree as shown in FIG.
Is adjusted so that the attenuation amount for the speaker SP2 is 1 and the attenuation amounts for the other speakers SP1, SP3, and SP4 are all 0. At this time, the attenuator group ATT9 for the front right channel has an attenuating amount of 1 for the speaker SP3 and the other speakers SP1, SP2, SP2.
The amount of attenuation for SP4 is all adjusted to zero.
At this time, the rear left channel attenuator group ATT
10 is the amount of attenuation for the speaker SP1 is 1,
The attenuation amounts for the other speakers SP2, SP3, and SP4 are all adjusted to zero. At this time, the rear right channel attenuator group ATT11 is connected to the speaker SP4.
Attenuation amount is 1 and other speakers SP1, S
The amount of attenuation for P2 and SP3 is all adjusted to zero. As a result, as shown in FIG. 6, an echo of the microphone sound with the direction of θ = 0 degrees in front of the microphone 16 is obtained.
A reverb sound field 107 is formed. When the lower limit of the attenuator amount is changed according to the distance D for the microphone sound as shown in FIG. 11, the lower limit value of the attenuator amount can be similarly changed for the echo reverb sound in accordance with the distance D. By storing the relationships of FIG. 7 to FIG. 12 described above as a table in the memory 64 of FIG. 4 or setting them as an arithmetic expression in the arithmetic unit 66, each attenuator group can be adjusted according to the front direction of the sound field. ATT1 to ATT
11 can be adjusted to the corresponding amount of attenuate.

(Embodiment 2) Another embodiment in which the present invention is applied to a karaoke apparatus will be described below. here,
The same parts as those in the first embodiment are denoted by the same reference numerals.
FIG. 13 shows a planar arrangement and a signal system of the speaker.
At the four corners of the room 10 when viewed from a plane, four speakers SP1 to SP4 are arranged toward the center of the room 10. Further, the hand microphone 16 is movably arranged at an arbitrary position in the room 10. The left (L) and right (R) two-channel accompaniment signals reproduced by a source reproducing unit (hard disk device, laser vision disk player, CD player, DVD player, etc.) (not shown) of the karaoke device are accompaniment signal processing. The gain is adjusted by the section 18 and input to the accompaniment signal attenuator group 20. The surround signal generation unit 22 'generates a four-channel surround signal for each of the speakers SP1 to SP4 based on the mixing signals of the left and right two-channel accompaniment signals. The contents of the surround parameters used in the surround signal generation unit 22 ', that is, the reflected sound parameters for generating the surround signal, are set by the surround control data. The microphone signal of one channel at the front center (C) collected by the microphone 16 is gain-adjusted by the microphone signal processing unit 26 and input to the microphone signal attenuator group 28. The echo reverb signal generator 30 'generates four-channel echo reverb signals for the speakers SP1 to SP4 based on the microphone signals. The contents of the echo reverb parameters used in the echo reverb signal generation unit 30 ', that is, the reflected sound parameters for the echo reverb signal are set by the echo reverb control data.

Each of the attenuator groups 20 and 28 includes an electronically controlled (analog or digital) attenuator (V) for each of the speakers SP1 to SP4 for each signal channel.
CA etc.), and adjusts the volume of the signal of each input channel to each of the speakers SP1 to SP4 and outputs the adjusted signal. The accompaniment signal and the microphone signal, the surround signal and the echo reverb signal whose volume has been adjusted by the attenuator groups 20 and 28 are mixed together by the mixing circuit 34 between the signals for the same speaker, and the power amplifiers PA1 to PA1.
It is supplied to each of the speakers SP1 to SP4 via the PA4 and is sounded.

The sound field direction setting unit 40 is, for example, as shown in FIG.
The sound field direction setting unit 40 has the same configuration as that shown in FIG.
Is the front direction θ in the plane of the sound field formed by the reproduced sounds of the speakers SP1 to SP4 with respect to the plane arrangement of the speakers SP1 to SP4 (θ means the first embodiment).
Is the same as ) Is set. The control unit 44 'controls the attenuator amounts of the attenuators 20 and 28, the surround signal generation unit 22' and the echo / reverb signal generation unit 3 according to the front direction θ of the sound field set by the sound field direction setting unit 40.
By controlling the distribution of the reflected sound parameters for each of the speakers SP1 to SP4 at 0 ', the sound field based on the reproduced sound of the speakers SP1 to SP4 is set to the center position 42a of the space 41 surrounded by the speakers SP1 to SP4. The front is formed in the direction.

FIG. 14 shows an example of the configuration of the control section 44 'in FIG. In the memory 64 ', regarding the attenuator groups 20 and 28, the speakers SP1 to SP
For each attenuator that adjusts the reproduction sound at P4, a table of the amount of attenuator for the direction θ in front of the sound field is stored. The memory 64 'includes a surround signal generation unit 22' and an echo reverb signal generation unit 30 '.
For each speaker SP1 with respect to the direction θ in front of the sound field.
A table indicating regions (angle ranges) of reflected sound parameters to be assigned to .about.SP4 is stored. Arithmetic unit 66 '
Reads the attenuation amount of each attenuator and the assigned area of the reflected sound parameter for each of the speakers SP1 to SP4 from the memory 64 'based on the sound field direction setting information sent from the sound field direction setting unit 40, and as a command value Output. Instead of storing the table of the assigned area of the attenuation amount and the reflected sound parameter in the memory 64 ', the calculation unit 62' calculates the attenuation amount and the reflected sound parameter allocation area for the front direction θ of the sound field for each attenuator. An expression may be set, and the attenuation amount and the reflected sound parameter assignment area may be calculated from the operation expression according to the sound field direction setting information and output as a command value.

The operation unit 66 'includes a sound field direction setting unit 4
It is also possible to correct the attenuator amount command value according to the setting information of the microphone distance D sent from 0. For example,
As the microphone distance D becomes shorter (that is, the center position 4
2a), the rate of change of the amount of attenuation with respect to the change in the direction of the sound field for the microphone sound is reduced (or the change width of the amount of attenuation is reduced), and the volume of the sound from the speakers other than the direction of the microphone 16 is increased. Thus, the sound field of the singing sound approaches the center position 42a. As a result, the sound field of the singing sound can be moved not only in the circumferential direction of the center position 42a but also in the radial direction.

FIG. 15 shows a specific example of the acoustic signal system shown in FIG. The accompaniment signal processing unit 18
In, the volume is adjusted by master volumes 72 and 74 via input amplifiers 68 and 70, and is input to the accompaniment signal attenuator group 20. Attenuator group 2 for accompaniment signal
0 means attenuator group ATT for each accompaniment sound channel
1, ATT2. Each attenuator group ATT1,
The ATT2 includes an attenuator for each of the speakers SP1 to SP4.

The left and right channel accompaniment signals are mixed (L + R or LR) by a mixing circuit 76 into one channel in a surround signal generation unit 22 'to generate reflected sound for each of the speakers SP1 to SP4. The reflected sound parameters (delay time and gain) are input to the convolution operation circuits 78 ', 80', 82 ', and 84'. Convolution operation circuits 78 ', 80', 8
The 2 'and 84' convolve the input signal with the reflected sound parameter to generate and output a reflected sound signal (surround signal of accompaniment sound) for each of the speakers SP1 to SP4.

The volume of the microphone signal is adjusted by the microphone master volume 88 via the input amplifier 86 in the microphone signal processing section 26, and the microphone signal attenuator group 2
8 is input. The microphone signal attenuator group 28 includes an attenuator group ATT7 composed of attenuators for the respective speakers SP1 to SP4.

In the echo reverb signal generator 30 ', the convolution operation circuit 9 in which reflected sound parameters (delay time and gain) for generating an echo reverb sound for each of the speakers SP1 to SP4 are set.
2 ', 94', 96 ', 98'. The convolution operation circuits 92 ', 94', 96 ', 98' perform convolution operation of the input signal and the reflected sound parameter to generate and output an echo reverb signal in each direction.

The mixing circuit 43 includes an attenuator group A
The outputs of the TT1, ATT2, ATT7, the surround signal generation unit 22 ', and the echo reverb signal generation unit 30' are added and synthesized among signals for the same speaker. Output signals of the mixing circuit 34 are power amplifiers PA1 to PA
4 to the corresponding speakers SP1 to SP4 for sound generation.

Attenuator group ATT1, ATT2, AT
Attenuation amount of T7 and convolution operation circuit 78 ',
80 ', 82', 84 ', 92', 94 ', 96', 9
The assignment of the area of the reflected sound parameter to 8 'will be described. Attenuator group ATT1, ATT for accompaniment sound
The characteristics of the amount of attenuation for each of the speakers 2 for SP1 to SP4 can be set, for example, as shown in FIG. 7 or FIG. Attenuator group ATT7 for microphone signal
The characteristic of the attenuation amount for each of the speakers SP1 to SP4 can be set, for example, as shown in FIG. 10 or FIG.

FIG. 16 shows an example of the distribution of the reflected sound set in the surround signal generator 22 '. The circle indicates the position of each reflected sound (virtual sound source position), and the magnitude of the circle indicates the loudness of the reflected sound. FIG. 16 shows a case where the direction in front of the sound field is set to the direction of θ = 0 degrees. Each reflected sound is reproduced by speakers adjacent to the left and right sides. That is, the center position 42a of the speaker placement space 42
The reflected sound distribution around the speakers SP1, SP2, SP
3, SP4 Divide into four areas A to D separated by diagonal positions (here, for convenience of explanation, assume that the areas A to D have an equal angle range of 90 degrees each), and each area A
.. D are reproduced by the next pair of speakers. -Reflected sound in area A: SP1, SP2-Reflected sound in area B: SP2, SP3-Reflected sound in area C: SP3, SP4-Reflected sound in area D: SP4, SP1 In this case, individual reflections For the sound, the localization (direction) in the circumferential direction in the corresponding area is determined by the volume ratio of the two speakers from which the sound is reproduced, and the magnitude of the reflected sound is determined by the sum of the volumes of the two speakers, The localization (distance) in the radial direction within the area is determined by the delay time (the same delay time for the sound reproduced by both speakers). In addition, as shown in FIG. 16, when the direction of the front of the sound field is set to the direction of θ = 0 degrees, the range of the angle θ of each of the regions A to D and the angle φ of the reflected sound distribution (φ is The angle in the clockwise direction with the direction being 0 degrees) is as follows. Area Range of θ (degrees) Range of φ (degrees) A 225 to 315 225 to 315 B 315 to 45 315 to 45 C 45 to 135 45 to 135 D 135 to 225 135 to 225

In order to create the surround sound field shown in FIG. 16, the convolution operation circuits 92 ', 94', and 9 shown in FIG.
In 6 'and 98', parameters of the reflected sound (reflected sound parameter) in the next area are set. Convolution operation circuit 78 '(SP1): Areas D and A (φ
= 135-315 degrees) Convolution operation circuit 80 '(SP2): Areas A and B (φ
= 225 to 45 degrees) Convolution operation circuit 82 '(SP3): Areas B and C (φ
= 315-135 degrees) Convolution operation circuit 84 '(SP4): Areas C and D (φ
= 45 to 225 degrees) Using the same reflected sound distribution as in FIG. 16, when the front direction of the sound field is set to θ = 90 degrees, the reflected sound distribution set in the surround signal generation unit 22 ′ is As shown in FIG. At this time, the range of the angle θ of each of the regions A to D and the range of the angle φ of the reflected sound distribution are as follows. Area Range of θ (degrees) Range of φ (degrees) A 225 to 315 135 to 225 B 315 to 45 225 to 315 C 45 to 135 315 to 45 D 135 to 225 45 to 135

In order to create the surround sound field shown in FIG. 17, the convolution operation circuits 92 ', 94', and 9 shown in FIG.
In 6 'and 98', parameters of the reflected sound (reflected sound parameter) in the next area are set. Convolution operation circuit 78 '(SP1): Areas D and A (φ
= 45 to 225 degrees) Convolution operation circuit 80 '(SP2): Areas A and B (φ
= 135-315 degrees) Convolution operation circuit 82 '(SP3): Areas B and C (φ
= 225 to 45 degrees) Convolution operation circuit 84 '(SP4): areas C and D (φ
= 315-135 degrees)

The case where the front direction of the sound field is set to the direction of θ = 0 degrees and 90 degrees has been described above. The convolution operation circuits 78 ', 80', and 8 for the front direction of the sound field are described.
FIG. 18 shows the regions of the reflected sound distribution to be assigned to 2 'and 84'. FIG. 14 shows the relationship of FIG.
Is stored in a memory 64 'as a table or set as an arithmetic expression in an arithmetic unit 66', so that the convolution arithmetic circuit 78 ',
By setting the reflected sound parameters of the corresponding reflected sound distribution areas at 80 ', 82', and 84 ', a surround sound field having the set direction as the front can be formed. The echo / reverb signal generation unit 30 'also performs the convolution operation circuits 92' and 94 according to the front direction of the sound field in exactly the same manner as the setting of the reflected sound parameter in the surround signal generation unit 22 'described above. ', 96', 9
8 ', a reflected sound parameter of a corresponding area of the reflected sound distribution for generating the echo reverb signal can be set.

In the above embodiment, the case where the direction of the microphone position is set as the direction in front of the sound field has been described. However, the present invention can also set the direction of the sound field irrespective of the microphone position. The present invention can also be applied to a system that does not use a microphone (a system other than karaoke). Further, in the above embodiment, the case where the present invention is applied to a system using four speakers has been described. However, the present invention can be applied to a system using three or more speakers.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a karaoke apparatus, and is a block diagram showing a plan layout diagram of a speaker and a signal system.

FIG. 2 is a layout diagram and a block diagram illustrating a configuration example of a sound field direction setting unit 40 in FIG. 1;

FIG. 3 is a layout diagram and a block diagram showing another configuration example of the sound field direction setting unit 40.

4 is a block diagram illustrating a configuration example of a control unit 44 in FIG.

FIG. 5 is a circuit diagram showing a specific example of the acoustic signal system of FIG. 1;

6 is a diagram schematically showing a sound field formed in a room in the karaoke apparatus of FIG.

7 is an attenuator group ATT1, A for accompaniment sound shown in FIG. 5;
It is a figure showing the example of a characteristic of the amount of attenuation for each speaker SP1-SP4 of TT2.

8 is a diagram showing another characteristic example of the attenuator amount of the attenuator groups ATT1 and ATT2 for the accompaniment sound in FIG. 5;

9 is a diagram illustrating a characteristic example of an attenuating amount for each of speakers SP1 to SP4 of the surround sound attenuator group ATT3 to ATT6 of the accompaniment sound of FIG. 5;

10 is a diagram illustrating a microphone signal attenuator group ATT of FIG. 5;
FIG. 7 is a diagram illustrating a characteristic example of the attenuation amount for each of speakers 7 to 7 of FIG.

11 is a diagram illustrating a microphone signal attenuator group ATT of FIG. 5;
7 is a diagram illustrating another characteristic example of the attenuator amount of No. 7. FIG.

FIG. 12 shows speakers SP1 to SP4 of the attenuator groups ATT8 to ATT11 for echo / reverb signals in FIG.
It is a figure which shows the example of a characteristic of the attenuate amount for every direction.

FIG. 13 is a diagram showing another embodiment in which the present invention is applied to a karaoke apparatus, and is a block diagram showing a plan layout of speakers and a signal system.

14 is a block diagram illustrating a configuration example of a control unit 44 ′ in FIG.

FIG. 15 is a circuit diagram showing a specific example of the acoustic signal system of FIG.

FIG. 16 is a plan view illustrating a region of a reflected sound distribution allocated to each convolution operation circuit of the surround signal generation unit 22 ′ in FIG. 13;

17 shows a case where the direction of the front of the sound field is changed using the same reflected sound distribution as in FIG. 16, and the area of the reflected sound distribution assigned to each convolution operation circuit of the surround signal generation unit 22 'in FIG. It is a top view explaining.

FIG. 18 shows the convolution operation circuits 78 ′ and 8 of the surround signal generation unit 22 ′ of FIG. 13 with respect to the front direction of the sound field.
FIG. 14 is a characteristic diagram showing a relationship between regions of a reflected sound distribution assigned to 0 ', 82', and 84 '.

[Explanation of symbols]

10 room (suitable space for sound reproduction), SP1 to S
P4: speaker, 42: space surrounded by the speaker, 42a: center position of the space surrounded by the speaker, 16: microphone, 20, 24, 28, 32: attenuator group, ATT1 to ATT11: attenuator group, 34
... mixing circuits, PA1 to PA4 ... power amplifiers (output paths), 40 ... sound field direction setting units (sound field direction setting means), 44, 44 '... control units, 78, 80, 82, 8
4,92,94,96,98,78 ', 80', 8
2 ', 84', 92 ', 94', 96 ', 98' ... convolution operation circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masakazu Fujishima 10-1, Nakazawa-cho, Hamamatsu-shi, Shizuoka Yamaha Corporation (72) Inventor Morito Yamada 10-1, Nakazawa-cho, Hamamatsu-shi, Shizuoka Yamaha Corporation F term (reference) 5D062 BB03 CC13 5D108 BE03 BE10

Claims (15)

[Claims] 1. An arrangement in which three or more speakers are arranged in an appropriate space for sound reproduction, and the speaker arrangement of a sound field formed by reproduced sounds of the speakers at a center position of a space surrounded by the speakers. Are variably set, and one or two or more sound signals of a plurality of channels constituting the stereophonic sound are formed so that the sound field of the reproduced sound is formed in accordance with the set direction. A sound reproduction method for assigning and reproducing sound from speakers. 2. An audio signal allocation amount of one channel to one speaker, wherein a relative direction of the one speaker with respect to a direction of the set sound field is a direction unique to a channel of the audio signal. Is adjusted in accordance with the relative direction of the speaker with respect to the channel-specific direction of the sound signal with respect to the direction of the set sound field, so as to gradually increase as approaching and gradually decrease as moving away. The sound reproducing method according to claim 1, wherein 3. The sound signal of the plurality of channels includes a signal picked up by a microphone in a space surrounded by the speaker, and a position of the microphone from a center position of the space surrounded by the speaker with respect to the speaker arrangement. 3. The sound reproducing method according to claim 1, wherein the direction of the sound field is set according to a relative direction. 4. The sound reproducing method according to claim 3, wherein a direction of a position of the microphone from a center position of a space surrounded by the speakers is set as a direction in front of the sound field. 5. When the distance between the center position of the space surrounded by the speaker and the position of the microphone is within a predetermined value, the direction of the sound field is changed to the speaker arrangement regardless of the direction of the position of the microphone. 5. The sound reproducing method according to claim 3, wherein the direction is a fixed direction appropriately determined. 6. A relative direction of one speaker and one sound based on the direction of the set sound field according to a distance between a center position of a space surrounded by the speakers and a position of the microphone. A change width or a change rate of an allocation amount of the audio signal to the speaker with respect to a deviation amount from a channel-specific direction of the signal is changed, and when the distance is short, the change width or the change rate of the allocation amount is reduced. 6. The sound reproducing method according to claim 3, wherein when the distance is long, the change width or the change rate of the assigned amount is increased. 7. An arrangement in which three or more speakers are arranged in an appropriate space for sound reproduction, and the speaker arrangement of a sound field formed by reproduced sounds of the speakers at a center position of a space surrounded by the speakers. Relative to the direction of the sound field, the distribution of the reflected sound to be reproduced around the center position with respect to the direction of the sound field, the relative position of each speaker with respect to the direction of the sound field. Depending on the direction
A region is divided in the circumferential direction around the center position and assigned to each speaker, and a common acoustic signal for reflected sound generation is convoluted with a reflected sound parameter corresponding to the distribution of the reflected sound assigned to each speaker. And generating a reflected sound signal, and reproducing each of the reflected sound signals from each of the corresponding speakers, thereby reproducing the reflected sound based on the direction of the set sound field. 8. A loudspeaker arrangement of three or more loudspeakers arranged in an appropriate space for sound reproduction, and a sound field formed by reproduced sounds of the loudspeakers at a center position of a space surrounded by the loudspeakers. Sound field direction setting means for variably setting the direction relative to the sound source, an attenuator group for adjusting the volume of the sound signals of a plurality of channels constituting the stereophonic sound for each of the speakers for each channel, and an attenuator group. A mixing circuit for mixing the volume-adjusted audio signals between signals for the same speaker, an output path for supplying the mixed audio signals for the respective speakers to the corresponding speakers, and one for one speaker The volume of the sound signal of the channel is determined based on the direction of the set sound field. The direction of the set sound field with respect to the channel-specific direction of the audio signal is set such that the relative direction of the sound signal gradually increases as approaching the channel-specific direction of the audio signal, and gradually decreases as the distance increases. A sound controller comprising: a controller configured to form the three-dimensional sound based on the direction of the sound field by controlling the attenuating amount of the attenuator group in accordance with the relative direction of the speaker with respect to the reference. apparatus. 9. The sound reproducing apparatus according to claim 8, wherein the sound field direction setting means sets the direction of the sound field based on an operation of an operator. 10. The sound signal of the plurality of channels includes a signal collected by a microphone in a space surrounded by the speaker, and the sound field direction setting means determines a position of the microphone in the space surrounded by the speaker. The direction of the sound field according to claim 9, wherein a direction of the sound field is set in accordance with a relative direction of a position of the microphone from a center position of a space surrounded by the speakers with respect to the speaker arrangement, based on an instruction operation. Sound reproduction device. 11. The sound signal of the plurality of channels includes a signal collected by a microphone in a space surrounded by the speaker, and the sound field direction setting means determines a position of the microphone in the space surrounded by the speaker. 9. The sound according to claim 8, wherein a direction of the sound field is set in accordance with a relative direction of a position of the microphone from a center position of a space surrounded by the speakers with respect to the speaker arrangement, based on the detection information. Playback device. 12. The direction setting means sets a direction of a position of the microphone from a center position of a space surrounded by the speaker as a direction in front of the sound field.
Or the sound reproducing device according to 11. 13. When the distance between the center position of the space surrounded by the loudspeaker and the position of the microphone is within a predetermined value, the direction setting means sets the sound field of the sound field irrespective of the direction of the position of the microphone. The direction is set as a fixed direction appropriately determined for the speaker arrangement.
3. The sound reproducing device according to any one of 2. 14. The controller according to claim 1, wherein said control unit controls a relative position of one speaker based on a direction of the set sound field according to a distance between a center position of a space surrounded by the speakers and a position of the microphone. The change width or change rate of the volume of the audio signal reproduced by the speaker with respect to the amount of deviation between the direction and the channel-specific direction of one audio signal is changed, and when the distance is short, the change width of the volume or 14. The sound reproducing apparatus according to claim 10, wherein the amount of change of the attenuator group is controlled so as to reduce the rate of change and increase the range of change or the rate of change of the volume when the distance is long. 15. A loudspeaker arrangement of three or more loudspeakers arranged in an appropriate space for sound reproduction, and a sound field formed by reproduced sounds of the loudspeakers at a center position of a space surrounded by the loudspeakers. Sound field direction setting means for variably setting the direction of the sound field; a convolution operation circuit provided for each of the speakers; and an attempt to reproduce around the center position based on the direction of the sound field. The distribution of the reflected sound is divided into regions in the circumferential direction around the center position according to the relative direction of each speaker with respect to the direction of the sound field, and the reflected sound is assigned to each speaker. And a control unit configured to set a reflected sound parameter corresponding to a distribution to each of the convolution operation circuits, and to realize a reflected sound reproduction based on the direction of the set sound field.