JP4419300B2 - Sound reproduction method and sound reproduction apparatus - Google Patents

Description

【００４２】
図１６のサラウンド音場を創生するために、図１５の畳み込み演算回路９２′，９４′，９６′，９８′には、次の領域の反射音のパラメータ（反射音パラメータ）が設定される。
・畳み込み演算回路７８′（ＳＰ１）：領域Ｄ，Ａ（φ＝１３５〜３１５度）
・畳み込み演算回路８０′（ＳＰ２）：領域Ａ，Ｂ（φ＝２２５〜４５度）
・畳み込み演算回路８２′（ＳＰ３）：領域Ｂ、Ｃ（φ＝３１５〜１３５度）
・畳み込み演算回路８４′（ＳＰ４）：領域Ｃ、Ｄ（φ＝４５〜２２５度）
図１６と同じ反射音分布を用いて、θ＝９０度の方角に音場の正面の方角を設定した場合に、サラウンド信号生成部２２′に設定される反射音分布を図１７に示す。このとき、各領域Ａ〜Ｄの角度θの範囲および反射音分布の角度φの範囲は次のとおりである。

【００４３】
図１７のサラウンド音場を創生するために、図１５の畳み込み演算回路９２′，９４′，９６′，９８′には、次の領域の反射音のパラメータ（反射音パラメータ）が設定される。
・畳み込み演算回路７８′（ＳＰ１）：領域Ｄ，Ａ（φ＝４５〜２２５度）
・畳み込み演算回路８０′（ＳＰ２）：領域Ａ，Ｂ（φ＝１３５〜３１５度）
・畳み込み演算回路８２′（ＳＰ３）：領域Ｂ、Ｃ（φ＝２２５〜４５度）
・畳み込み演算回路８４′（ＳＰ４）：領域Ｃ、Ｄ（φ＝３１５〜１３５度）
【００４４】
以上はθ＝０度、９０度の方角に音場の正面の方角を設定した場合について説明したが、音場の正面の方角に対する畳み込み演算回路７８′，８０′，８２′，８４′に割り当てるべき反射音分布の領域をまとめると図１８に示すようになる。図１８の関係を図１４のメモリ６４′にテーブルとして記憶しあるいは演算部６６′に演算式として設定しておくことにより、音場の正面の方角の設定に応じて、畳み込み演算回路７８′，８０′，８２′，８４′に、該当する反射音分布の領域の反射音パラメータを設定して、該設定された方角を正面とするサラウンド音場を形成することができる。エコー・リバーブ信号生成部３０′についても、以上説明したサラウンド信号生成部２２′における反射音パラメータの設定と全く同様の手法により、音場の正面の方角に応じて、畳み込み演算回路９２′，９４′，９６′，９８′に、エコー・リバーブ信号生成用の反射音分布の該当する領域の反射音パラメータを設定することができる。
【００４５】
なお上記実施の形態では、マイク位置の方角を音場の正面の方角として設定する場合について説明したが、この発明はマイク位置に無関係に音場の方角を設定することもできる。また、この発明は、マイクを使用しないシステム（カラオケ以外のシステム）にも適用することができる。また、上記実施の形態では、４個のスピーカを使用するシステムにこの発明を適用した場合について説明したが、この発明は３個以上のスピーカを使用するシステムに適用することができる。
【図面の簡単な説明】
【図１】 この発明をカラオケ装置に適用した実施の形態を示す図で、スピーカの平面配置図および信号系統を示すブロック図である。
【図２】 図１の音場方角設定部４０の構成例を示す配置図およびブロック図である。
【図３】 音場方角設定部４０の別の構成例を示す配置図およびブロック図である。
【図４】 図１の制御部４４の構成例を示すブロック図である。
【図５】 図１の音響信号系統の具体例を示す回路図である。
【図６】 図１のカラオケ装置で部屋内に形成される音場を模式的に示す図である。
【図７】 図５の伴奏音用アッテネータ群ＡＴＴ１，ＡＴＴ２の各スピーカＳＰ１〜ＳＰ４向けごとのアッテネート量の特性例を示す図である。
【図８】 図５の伴奏音用アッテネータ群アッテネータ群ＡＴＴ１，ＡＴＴ２のアッテネート量の他の特性例を示す図である。
【図９】 図５の伴奏音のサラウンド音用アッテネータ群ＡＴＴ３〜ＡＴＴ６の各スピーカＳＰ１〜ＳＰ４向けごとのアッテネート量の特性例を示す図である。
【図１０】 図５のマイク信号用アッテネータ群ＡＴＴ７の各スピーカＳＰ１〜ＳＰ４向けごとのアッテネート量の特性例を示す図である。
【図１１】 図５のマイク信号用アッテネータ群ＡＴＴ７のアッテネート量の他の特性例を示す図である。
【図１２】 図５のエコー・リバーブ信号用アッテネータ群ＡＴＴ８〜ＡＴＴ１１の各スピーカＳＰ１〜ＳＰ４向けごとのアッテネート量の特性例を示す図である。
【図１３】 この発明をカラオケ装置に適用した他の実施の形態を示す図で、スピーカの平面配置図および信号系統を示すブロック図である。
【図１４】 図１３の制御部４４′の構成例を示すブロック図である。
【図１５】 図１３の音響信号系統の具体例を示す回路図である。
【図１６】 図１３のサラウンド信号生成部２２′の各畳み込み演算回路に割り当てられる反射音分布の領域を説明する平面図である。
【図１７】 図１６と同じ反射音分布を用いて、音場の正面の方角を変更した場合に、図１３のサラウンド信号生成部２２′の各畳み込み演算回路に割り当てられる反射音分布の領域を説明する平面図である。
【図１８】 音場の正面の方角に対する図１３のサラウンド信号生成部２２′の畳み込み演算回路７８′，８０′，８２′，８４′に割り当てられる反射音分布の領域の関係を示す特性図である。
【符号の説明】
１０…部屋（音響再生をする適宜の空間）、ＳＰ１〜ＳＰ４…スピーカ、４２…スピーカによって囲まれる空間、４２ａ…スピーカによって囲まれる空間の中心位置、１６…マイク、２０，２４，２８，３２…アッテネータ群、ＡＴＴ１〜ＡＴＴ１１…アッテネータ群、３４…ミキシング回路、ＰＡ１〜ＰＡ４…パワーアンプ（出力経路）、４０…音場方角設定部（音場方角設定手段）、４４，４４′…制御部、７８，８０，８２，８４，９２，９４，９６，９８，７８′，８０′，８２′，８４′，９２′，９４′，９６′，９８′…畳み込み演算回路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an acoustic reproduction method and an acoustic reproduction apparatus that can be applied to karaoke performances, etc., and can perform acoustic reproduction by appropriately setting the direction (direction) of a sound field with respect to the arrangement of speakers.
[0002]
[Prior art]
In the conventional karaoke performance, the direction of the sound field formed by the reproduced sound is fixedly determined by the arrangement of the speakers.
[0003]
[Problems to be solved by the invention]
Karaoke performance on the stage is preset so that the direction of the sound field by the reproduced sound matches the direction of the stage, so that the singer can sing with a sense of unity with the sound field. . In addition, the karaoke performance can be listened to with a sense of unity between visual and auditory senses, since the direction desired by the singer matches the direction of the sound field. On the other hand, in karaoke performances at karaoke boxes, restaurants, etc., when singing at the position where each person is sitting, depending on the positional relationship between the singer and the speaker, the direction of the singing and the sound field It was very different from the direction, and it was difficult for singers to hear and for listeners.
The present invention has been made in view of the above points, and intends to provide an acoustic reproduction method and an acoustic reproduction apparatus capable of performing acoustic reproduction by appropriately setting the direction of the sound field with respect to the arrangement of the speakers. It is.
[0004]
[Means for Solving the Problems]
This invention sound of In the sound reproduction method, three or more speakers are arranged in an appropriate space for sound reproduction, and the speaker arrangement of the sound field formed by the reproduced sound of the speakers at the center position of the space surrounded by the speakers The relative direction with respect to the sound is variably set, and the sound signals of a plurality of channels constituting the three-dimensional sound are each set to be 1 or 2 or more so that the sound field of the reproduced sound matches the set direction. It is assigned to the speaker and reproduced. According to this, it is possible to form the sound field of the reproduced sound by the sound signals of a plurality of channels in an appropriately set direction.
[0005]
This invention sound of In the sound reproduction method, when the sound signals of the plurality of channels are signals in each direction in the plane, the three or more speakers can be arranged in the plane. Further, the allocation amount of the acoustic signal of one channel to one speaker is set so that the relative direction of the one speaker with respect to the direction of the set sound field becomes closer to the direction specific to the channel of the acoustic signal. It is possible to adjust according to the relative direction of the speaker with respect to the direction of the set sound field as a reference with respect to the direction specific to the channel of the acoustic signal so as to gradually increase and decrease gradually with increasing distance. it can. The channel-specific direction of the sound signal is, for example, left front for an accompaniment sound signal for the left channel, right front for an accompaniment sound signal for the right channel, and a front center for an accompaniment sound signal for the microphone signal. Left front if accompaniment surround signal (or mic echo reverb sound signal for front left channel), right front, rear left if accompaniment surround signal for front right channel (or mic echo reverb sound signal for front right channel) If the accompaniment surround signal for the channel (or microphone echo reverb sound signal for the rear left channel) is left rearward, if the accompaniment surround signal for the rear right channel (or microphone echo reverb sound signal for the rear right channel) is rearward right Each is applicable.
[0006]
In addition, the multi-channel acoustic signal may include a microphone sound channel and an accompaniment sound channel. 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 (for example, front left and right and rear left and right four channels) constituting the echo sound of the microphone. Accompaniment sound channels (for example, front left and right two channels) and a plurality of channels (for example, front left and right and rear left and right four channels) constituting the surround sound of the accompaniment sound can be included. When the sound signals of the plurality of channels include a signal picked up by a microphone in a space surrounded by the speakers, the position of the microphone from the center position of the space surrounded by the speakers is relative 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 speaker can be set as the direction of the front of the sound field. Further, when the distance between the center position of the space surrounded by the speakers and the microphone position is within a predetermined value, the direction of the sound field is appropriately set with respect to the speaker arrangement regardless of the direction of the microphone position. It can be a fixed direction. Furthermore, 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 one acoustic signal based on the set direction of the sound field are used. Change the amount of change or rate of change of the allocated amount of the acoustic signal to the speaker with respect to the amount of deviation from the channel-specific direction, and reduce the amount of change or rate of change of the allocated amount when the distance is short, When the distance is long, the change amount or change rate of the allocated amount can be increased.
[0007]
The second embodiment to be described later includes the following sound reproduction method invention in addition to the sound reproduction method according to the present invention. this is In an appropriate space for sound reproduction, three or more speakers are arranged, and the sound field formed by the reproduced sound of the speakers at the center position of the space surrounded by the speakers is relative to the speaker arrangement. The direction of the sound is set to be variable, and the distribution of the reflected sound to be reproduced around the center position with respect to the direction of the sound field is determined according to the relative direction of each speaker with respect to the direction of the sound field. Then, a region is divided in the circumferential direction around the center position and assigned to each speaker, and a reflected sound parameter corresponding to the distribution of the reflected sound assigned to each speaker is assigned a common acoustic signal for generating reflected sound. Reflected sound reproduction is performed based on the direction of the set sound field by generating a reflected sound signal by performing convolution and reproducing each reflected sound signal from each corresponding speaker. Than is. According to this, the sound field of the reflected sound can be formed in an appropriately set direction.
[0008]
This invention sound of The reverberation reproduction apparatus includes three or more speakers arranged in an appropriate space for sound reproduction, and the speaker arrangement of the sound field formed by the reproduced sound of the speakers at the center position of the space surrounded by the speakers. A sound field direction setting means for variably setting a relative direction with respect to the attenuator group that adjusts the volume of sound signals of a plurality of channels constituting stereophonic sound for each speaker for each channel, and the attenuator group A mixing circuit that mixes each sound signal whose volume has been adjusted to signals for the same speaker, an output path that supplies the mixed sound signal for each speaker to the corresponding speaker, and one for each speaker The volume of the sound signal of the channel is set to the one speaker based on the direction of the set sound field. The direction of the set sound field relative to the channel-specific direction of the acoustic signal is set so that the relative direction gradually increases toward the channel-specific direction of the acoustic signal and gradually decreases as the distance increases. And a control unit that configures the three-dimensional 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. . According to this, it is possible to form the sound field of the reproduced sound by the sound signals of a plurality of channels in an appropriately set direction.
[0009]
This invention sound of In the sound reproduction device, the attenuator group can be constituted by, for example, an electronic (analog type or digital type) attenuator. Further, as a method of controlling the attenuator group, for example, the attenuation amount of the attenuator group according to the relative direction of the speaker relative to the channel-specific direction of each acoustic signal based on the direction of the set sound field. A table is stored in the memory, and each corresponding attenuation amount is read from the table in accordance with the relative direction of the speaker, so that the attenuator group can be controlled to the corresponding attenuation amount. Alternatively, as another method, an arithmetic expression of the attenuation amount of the attenuator group according to the relative direction of the speaker with respect to the direction specific to the channel of each acoustic signal based on the direction of the set sound field is preliminarily obtained. Depending on the relative direction of the speaker, the corresponding attenuation amount can be calculated from the calculation formula to control the attenuator group to the corresponding attenuation amount. The attenuator group can be prepared for each channel of the acoustic signal, for example. Further, the sound field direction setting means can set the direction of the sound field based on, for example, an operation of the operator. When the sound signals of the plurality of channels include a signal picked up by a microphone in a space surrounded by the speaker (for example, when configured as a karaoke device), the sound field direction setting means is surrounded by the speaker. The direction of the sound field is set in accordance with a relative direction of the microphone position from the center position of the space surrounded by the speaker with respect to the speaker arrangement based on an operation for instructing the position of the microphone in the space. Can be. When the sound signals of the plurality of channels include a signal picked up by a microphone in a space surrounded by the speaker, the sound field direction setting unit is configured to determine the 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 speaker with respect to the speaker arrangement. Further, the direction setting means can set the direction of the position of the microphone from the center position of the space surrounded by the speaker as the direction of the front of the sound field. Further, the direction setting means, 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, regardless of the direction of the position of the microphone, the direction of the sound field, It can be set as a fixed direction appropriately determined for the speaker arrangement. In addition, the control unit may determine a relative direction of one speaker based on the set direction of the sound field and 1 according to a distance between a center position of a space surrounded by the speakers and the position of the microphone. When the distance is close, the change range or rate of change of the volume of the sound signal reproduced by the speaker is changed with respect to the amount of deviation from the channel-specific direction of the two audio signals. When the distance is small, the attenuation amount of the attenuator group can be controlled to increase the change width or change rate of the volume.
[0010]
The second embodiment to be described later includes the following invention of a sound reproducing device in addition to the sound reproducing device according to the present invention. this is , Relative to the speaker arrangement of three or more speakers arranged in an appropriate space for sound reproduction and the sound field formed by the reproduced sound of the speaker at the center position of the space surrounded by the speakers Sound field direction setting means for variably setting the direction, a convolution operation circuit provided corresponding to each speaker, and a distribution of reflected sound to be reproduced around the center position with respect to the direction of the sound field Corresponding to the distribution of the reflected sound assigned to each speaker by dividing the region in the circumferential direction around the center position according to the relative direction of each speaker relative to the direction of the sound field. And a control unit for setting a reflected sound parameter in each of the convolution arithmetic circuits to realize reflected sound reproduction based on the direction of the set sound field.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
An embodiment in which the present invention is applied to a karaoke apparatus will be described below. FIG. 1 shows a planar arrangement and signal system of speakers. Four speakers SP <b> 1 to SP <b> 4 are arranged toward the center of the room 10 at the four corners of the room 10 as viewed from above. Further, the hand microphone 16 is disposed so as to be movable to an arbitrary position in the room 10. Accompaniment signal processing is performed on two left (L) and right (R) accompaniment signals reproduced by a source reproduction unit (hard disk device, laser vision disc player, CD player, DVD player, etc.) (not shown) of a karaoke apparatus. The gain is adjusted by the unit 18 and input to the accompaniment signal attenuator group 20. The surround signal generation unit 22 is configured to generate accompaniment sounds of four channels of front left (FL), front right (FR), rear left (RL), and rear right (RR) based on the mixing signal of the accompaniment signals of the left and right channels. 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 signals are set by the surround control data. The surround signal of each channel is input to the surround signal attenuator group 24.
[0012]
The microphone signal of one channel at the front center (C) picked up 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 generation unit 30 generates echo reverb signals of four channels of front left (FL), front right (FR), rear left (RL), and rear right (RR) based on the microphone signal. The contents of the echo reverb parameter used in the echo reverb signal generation unit 30, that is, the reflected sound parameter for the echo reverb signal, is set by the echo reverb control data. The echo reverb signal of each channel is input to the echo / reverb signal attenuator group 32.
[0013]
Each attenuator group 20, 24, 28, 32 has an electronically controlled (analog or digital) attenuator (such as VCA) for each speaker SP1 to SP4 for each input signal channel. The volume of the signal is adjusted for each of the speakers SP1 to SP4 and output. The volume-adjusted signal is mixed between signals for the same speaker by the mixing circuit 34, and supplied to the speakers SP1 to SP4 via the power amplifiers PA1 to PA4 to be sounded.
[0014]
The sound field direction setting unit 40 sets a relative direction in the plane of the sound field formed by the reproduced sound of the speakers SP1 to SP4 with respect to the planar arrangement of the speakers SP1 to SP4. Here, the direction around 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 represented by θ {θ is the direction from the center position 42a toward the intermediate position between the speakers SP2 and SP3. 0 °), the relative direction of the position of the microphone 16 with respect to the reference direction is represented by θ, and the direction of the position of the microphone 16 is set as the direction θ of the front of the sound field. It shall be (see FIG. 6). The control unit 44 controls the attenuator groups 20, 24, 28, and 32 according to the front direction θ of the sound field set by the sound field direction setting unit 40, and the sound field due to the reproduced sound of the speakers SP1 to SP4 is The front direction is formed in the direction θ set with respect to the center position 42a of the space 41 surrounded by SP1 to SP4.
[0015]
A configuration example of the sound field direction setting unit 40 is shown in FIG. This is to set the direction θ of the 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) includes a display 46, an operator 48 such as a joystick or a mouse, and a calculation unit 49. On the display 46, the planar arrangement of the speakers SP1 to SP4 and the microphone 16 in the room 10 of FIG. 1 is displayed. The display positions of the speakers SP1 to SP4 and the microphone 16 are moved on the display 46 by the operator operating the operator 48 so that the actual positions of the speakers SP1 to SP4 and the microphone 16 in the room 1 are matched. To set. Based on the positions of the speakers SP1 to SP4 set on the display 46, the calculation unit 49 obtains the center position 42a (for example, the center of gravity position) of the space 42 surrounded by the speakers SP1 to SP4 (the positions of the speakers SP1 to SP4 are If fixed, the coordinates of the center position 42a can be fixedly set.) 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 calculated as angle θ and distance D with respect to the reference direction, angle θ is output as setting information for the direction of the front of the sound field, and distance D is output as setting information for the distance of microphone 16 from center position 42a.
[0016]
Another configuration example of the sound field direction setting unit 40 is shown in FIG. This sets the front direction θ 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 is disposed at an appropriate position such as a wall surface, and ultrasonic sensors (ultrasonic microphones) 51 to 54 are disposed in the speakers SP1 to SP4. . The microphone 16 includes a receiver 55 that receives a radio frequency signal transmitted from the transmitter 50 and an ultrasonic oscillator 56 that intermittently oscillates an ultrasonic wave in synchronization with a synchronization signal included in the radio frequency. Built in.
[0017]
The sound field direction setting unit 40 (microphone position detection unit) includes a synchronization signal generator 58, a transmission unit 60, a reception unit 61, and a calculation unit 62. The synchronization signal generator 58 generates a predetermined synchronization signal. The transmitter 60 modulates this synchronization signal with a radio frequency signal (carrier wave) and transmits it from the transmitter 50. The microphone 16 receives the radio frequency signal with the receiver 55, demodulates the synchronization signal, and intermittently oscillates ultrasonic waves from the ultrasonic oscillator 56 in synchronization with the synchronization signal. The ultrasonic waves are respectively received by the ultrasonic sensors 51 to 54, and the reception signals are transmitted to the calculation unit 62 through the reception unit 61. The arithmetic unit 62 measures the time difference (corresponding to the distance from the microphone 16 to each of the ultrasonic sensors 51 to 54) between the synchronization signal generated from the synchronization signal generator 58 and the received signal of each of the ultrasonic sensors 51 to 54. Based on these measured values, the position of the microphone 16 (relative position with respect to the ultrasonic sensors 51 to 54) is calculated.
[0018]
The center position 42a of the space 42 surrounded by the speakers SP1 to SP4 can be obtained, for example, as follows. First, the microphone 16 is placed at the position of the ultrasonic sensor 51 (speaker SP1) and the above measurement is performed to measure the distances from the speaker SP1 to the other speakers SP2, SP3 and SP4. It moves to the position of the sensor 53 (speaker SP3) and performs the same measurement to measure the distances from the speaker SP3 to the speakers (SP1), SP2 and SP4. 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 (for example, the center of gravity position) can be obtained from the arrangement of the space 42. .
[0019]
For example, the calculation unit 62 obtains the center position 42a of the space 42 in advance by the above-described method, and at the time of actual karaoke performance, based on the detection information of the position of the microphone 16 that changes from moment to moment, the microphone with respect to the center position 42a. 16 is obtained as an angle θ and a distance D with respect to a reference direction (a direction connecting the center position 42a and the intermediate positions of the speakers SP2 and SP3), and the angle θ is output as setting information for the direction in front of the sound field. The distance D is output as setting information of the distance of the microphone 16 from the center position 42a. If the distance D is short, even if the position of the microphone 16 slightly moves around the central position 42a, the direction of the sound field may change greatly, which may make it difficult to sing and listen. When the distance D is within a predetermined value, the unit 62 outputs a value indicating a predetermined fixed direction (for example, θ = 0 degrees) as the sound field direction setting information regardless of the direction of the microphone 16. .
[0020]
A configuration example of the control unit 44 of FIG. 1 is shown in FIG. In the memory 64, for the attenuator groups 20, 24, 28, and 32, a table of attenuation amounts with respect to the direction θ of the front of the sound field for each attenuator that adjusts the sound reproduced by each speaker SP1 to SP4 of the acoustic signal of each channel. Is remembered. The calculation unit 66 reads the attenuation amount of each attenuator from the memory 64 based on the sound field direction setting information sent from the sound field direction setting unit 40 and outputs it as a command value. Instead of storing the attenuation amount table in the memory 64, an arithmetic expression for the attenuation amount with respect to the front direction θ of the sound field for each attenuator is set in the calculation unit 62, and according to the sound field direction setting information. It is also possible to calculate the attenuation amount from the calculation formula and output it as a command value.
[0021]
The calculation unit 66 can also correct the attenuator amount command value according to the setting information of the microphone distance D sent from the sound field direction setting unit 40. For example, as the microphone distance D becomes shorter (that is, closer to the center position 42a), the attenuation rate of the microphone sound with respect to the change in the front direction θ of the sound field is decreased (or the variation amount of the attenuation amount is decreased). Then, by increasing the volume from the speaker other than the direction of the microphone 16, 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.
[0022]
A specific example of the acoustic signal system of FIG. 1 is shown in FIG. The accompaniment signals of the left and right channels are adjusted in volume by the master volumes 72 and 74 via the input amplifiers 68 and 70 in the accompaniment signal processing unit 18 and input to the accompaniment signal attenuator group 20. The accompaniment signal attenuator group 20 includes attenuator groups ATT1, ATT2 for each accompaniment sound channel. Each attenuator group ATT1, ATT2 is composed of an attenuator for each speaker SP1-SP4.
[0023]
The accompaniment signals of the left and right channels are mixed (L + R or LR) by the mixing circuit 76 into one channel in the surround signal generator 22, and reflected in each direction (front left, front right, back left, back right). Reflected sound parameters for generating sound (parameters composed of a combination of delay time data and gain data representing individual reflected sounds) are input to convolution operation circuits 78, 80, 82, 84 in which the sound is generated. The convolution operation circuits 78, 80, 82, 84 perform a convolution operation on the input signal and the reflected sound parameter to generate and output a reflected sound signal (accompaniment sound surround signal) 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 ATT6 for each channel of the surround signal. Each attenuator group ATT3 to ATT6 is configured with an attenuator for each speaker SP1 to SP4.
[0024]
The microphone signal is volume-adjusted by the microphone master volume 88 via the input amplifier 86 in the microphone signal processing unit 26 and input to the microphone signal attenuator group 28. The microphone signal attenuator group 28 includes an attenuator group ATT7 including attenuators for the speakers SP1 to SP4.
The microphone signal is a reflected sound parameter (delay time representing each reflected sound) for generating echo reverb sound in each direction (front left, front right, rear left, rear right) in the echo reverb signal generation unit 30. (Parameters composed of combinations of data and gain data) are input to the convolution operation circuits 92, 94, 96, 98 in which the parameters are set. The convolution operation circuits 92, 94, 96, and 98 perform convolution operations on the input signals and the reflected sound parameters, and generate and output echo reverb signals 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 channel of the echo reverb signal. Each attenuator group ATT8 to ATT11 includes an attenuator for each speaker SP1 to SP4.
[0025]
The mixing circuit 43 adds and synthesizes the outputs of the attenuator groups ATT1 to ATT11 with 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 be sounded.
The amount of attenuation of the attenuator groups ATT1 to ATT11 will be described. Here, as shown in FIG. 6, accompaniment sounds in the room 10 in which 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 is the front direction of the sound field, respectively. Field 101 (sound field by accompaniment sound of left and right 2 channels), surround sound field 103 (sound field by sound of 4-channel surround sound of accompaniment sound), microphone sound field 105 (sound field by microphone sound of 1 channel), echo reverb sound It is assumed that a field 107 (a sound field based on a 4-channel echo reverb sound of a microphone sound) is formed.
[0026]
FIG. 7 shows a characteristic example of the attenuation amount for each of the speakers SP1 to SP4 of the accompaniment sound attenuator group ATT1, ATT2. According to this, the amount of each attenuation gradually changes in accordance with the direction of the front of the sound field (the direction of the microphone position) θ (the sum of the volume in each direction is kept equal), for example, the front of the sound field When the direction θ is 0 degrees as shown in FIG. 6, the attenuation data group ATT1 for the left channel has an attenuation amount (gain) for the speaker SP2, and all attenuation amounts for the other speakers SP1, SP3, SP4. Adjusted to zero. At this time, in the right channel attenuator group ATT2, the attenuation amount for the speaker SP3 is adjusted to 1, and the attenuation amounts for the other speakers SP1, SP2, SP4 are all adjusted to 0. As a result, as shown in FIG. 6, an accompaniment sound field 101 is formed around the speakers SP2 and SP3 with the direction of θ = 0 degrees in front. As shown in FIG. 8, the lower limit value of the attenuation amount of the attenuator groups ATT1, ATT2 is changed according to, for example, the distance D between the center position 42a of the speaker arrangement space 42 and the microphone 16 (accordingly, the attenuation amount). The change width or rate of change is changed.) For example, when the distance D is large, the lower limit value is lowered (the amount of change in the attenuation amount and the rate of change is large), the volume other than the microphone position direction is reduced, and for customers other than the singer Use conservatively and locally, and when the distance D is small, the lower limit is increased (the amount of change in the attenuation amount and the rate of change increase), and a method of use that excites the atmosphere as a whole becomes possible. .
[0027]
FIG. 9 shows a characteristic example of the attenuation amount for each speaker SP1 to SP4 of the surround sound attenuator group ATT3 to ATT6 of the accompaniment sound. According to this, the amount of each attenuation gradually changes in accordance with the direction θ of the front of the sound field (the sum of the volumes in each direction is kept equal). For example, the direction θ of the front of the sound field is shown in FIG. As shown, the front left channel attenuator group ATT3 has an attenuation amount of 1 for the speaker SP2, and all attenuation amounts for the other speakers SP1, SP3, and SP4 are adjusted to 0. At this time, the attenuator group ATT4 for the front right channel is adjusted so that the attenuation amount for the speaker SP3 is 1, and the attenuation amounts for the other speakers SP1, SP2, SP4 are all 0. At this time, in the rear left channel attenuator group ATT5, the attenuation amount for the speaker SP1 is adjusted to 1, and the attenuation amounts for the other speakers SP2, SP3, SP4 are all adjusted to 0. At this time, in the rear right channel attenuator group ATT6, the attenuation amount for the speaker SP4 is adjusted to 1, and the attenuation amounts for the other speakers SP1, SP2, SP3 are all adjusted to 0. As a result, as shown in FIG. 6, a surround sound field 103 of an accompaniment sound is formed in the entire space 42 surrounded by the speakers, with the direction of θ = 0 degree being the front. When the lower limit value of the attenuation amount is changed according to the distance D as shown in FIG. 8 for the accompaniment sound, the lower limit value of the attenuation amount can also be changed according to the distance D for the surround sound.
[0028]
FIG. 10 shows a characteristic example of the attenuation amount for each speaker SP1 to SP4 of the microphone signal attenuator group ATT7. According to this, the amount of each attenuation gradually changes according to the direction θ of the front of the sound field (the sum of the sound volume in each direction is kept equal). For example, the direction θ of the front of the sound field is shown in FIG. As shown, the attenuator group ATT7 adjusts the attenuation amount for the speakers SP2 and SP3 to 1 and the attenuation amounts for the other speakers SP1 and SP4 to 0 as shown in FIG. As a result, as shown in FIG. 6, a microphone sound field 105 is formed around the microphone 16 with the direction of θ = 0 degrees in front. As shown in FIG. 11, the lower limit value of the attenuation amount of the attenuator group ATT7 is changed in accordance with, for example, the distance D between the center position 42a of the speaker arrangement space 42 and the microphone 16 (according to this, the variation amount of the attenuation amount). (Alternatively, the rate of change is changed.) For example, when the distance D is large, the lower limit value is lowered (attenuation amount change width and change rate is increased), and when the distance D is small, the lower limit value is increased (attenuation amount change width and change rate). Thus, the singing sound reproduced from the speakers SP1 to SP4 moves in the same direction in accordance with the movement of the microphone 16 in the radial direction with respect to the center position 42a, and the position of the singing sound and the speakers SP1 to SP4 A sense of unity of the singing sound played is obtained.
[0029]
FIG. 12 shows a characteristic example of the attenuation amount for each speaker SP1 to SP4 of the echo / reverb signal attenuator group ATT8 to ATT11. According to this, the amount of each attenuator gradually changes in accordance with the direction θ of the front of the sound field (the sum of the volumes in each direction is kept equal). For example, the direction θ of the front of the sound field is shown in FIG. In the case of 0 degree, the front left channel attenuator group ATT8 has an attenuation amount of 1 for the speaker SP2, and all attenuation amounts for the other speakers SP1, SP3, SP4 are adjusted to 0. At this time, in the front right channel attenuator group ATT9, the attenuation amount for the speaker SP3 is adjusted to 1, and the attenuation amounts for the other speakers SP1, SP2, SP4 are all adjusted to 0. At this time, in the rear left channel attenuator group ATT10, the attenuation amount for the speaker SP1 is adjusted to 1, and the attenuation amounts for the other speakers SP2, SP3, SP4 are all adjusted to 0. At this time, in the rear right channel attenuator group ATT11, the attenuation amount for the speaker SP4 is adjusted to 1, and the attenuation amounts for the other speakers SP1, SP2, SP3 are all adjusted to 0. As a result, as shown in FIG. 6, an echo / reverb sound field 107 of the microphone sound is formed around the microphone 16 with the direction of θ = 0 degree in front. When the lower limit value of the attenuator amount is changed according to the distance D as shown in FIG. 11 for the microphone sound, the lower limit value of the attenuation amount can also be changed according to the distance D for the echo reverb sound.
7 to 12 and the like described above are stored as a table in the memory 64 of FIG. 4 or set as an arithmetic expression in the arithmetic unit 66, so that each attenuator group can be selected according to the direction of the front of the sound field. ATT1 to ATT11 can be adjusted to the corresponding attenuation amount.
[0030]
(Embodiment 2)
Another embodiment in which the present invention is applied to a karaoke apparatus will be described below. Here, the same reference numerals are used for portions common to the first embodiment.
FIG. 13 shows the planar arrangement of the speakers and the signal system. Four speakers SP <b> 1 to SP <b> 4 are arranged toward the center of the room 10 at the four corners of the room 10 as viewed from above. Further, the hand microphone 16 is disposed so as to be movable to an arbitrary position in the room 10. Accompaniment signal processing is performed on two left (L) and right (R) accompaniment signals reproduced by a source reproduction unit (hard disk device, laser vision disc player, CD player, DVD player, etc.) (not shown) of a karaoke apparatus. The gain is adjusted by the unit 18 and input to the accompaniment signal attenuator group 20. The surround signal generation unit 22 ′ generates a 4-channel surround signal for each of the speakers SP1 to SP4 based on a mixing signal of accompaniment signals of 2 left and right channels. The contents of the surround parameters used by the surround signal generator 22 ', that is, the reflected sound parameters for generating the surround signals are set by the surround control data. The microphone signal of one channel at the front center (C) picked up 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 4-channel echo reverb signal for each of the speakers SP1 to SP4 based on the microphone signal. The contents of the echo reverb parameter used in the echo reverb signal generator 30 ', that is, the reflected sound parameter for the echo reverb signal is set by the echo reverb control data.
[0031]
Each attenuator group 20, 28 has an electronically controlled (analog or digital) attenuator (VCA, etc.) for each speaker SP1-SP4 for each signal channel, and the signal of each input channel is sent to each speaker SP1-SP4. Adjust the volume for each output. The accompaniment signal, microphone signal, surround signal and echo reverb signal whose volume is adjusted by the attenuator groups 20 and 28 are mixed with each other for the same speaker by the mixing circuit 34, and each speaker SP1 to SP4 is passed through the power amplifiers PA1 to PA4. Supplied to and pronounced.
[0032]
The sound field direction setting unit 40 is configured, for example, in the same manner as shown in FIGS. 2 and 3, and the sound field direction setting unit 40 reproduces the reproduced sound of the speakers SP1 to SP4 with respect to the planar arrangement of the speakers SP1 to SP4. Is set to the front direction θ in the plane of the sound field formed by (the meaning of θ is the same as in the first embodiment). The control unit 44 'determines the attenuator amount of the attenuator groups 20 and 28 and the surround signal generation unit 22' and the echo / reverb signal generation unit 30 'according to the front direction θ of the sound field set by the sound field direction setting unit 40. The distribution of the reflected sound parameters for each speaker SP1 to SP4 is controlled, and the sound field due to the reproduced sound of the speakers SP1 to SP4 is faced in the direction set with respect to the center position 42a of the space 41 surrounded by the speakers SP1 to SP4. To be formed.
[0033]
FIG. 14 shows a configuration example of the control unit 44 ′ of FIG. In the memory 64 ', a table of attenuation amounts with respect to the direction θ of the front of the sound field is stored for each attenuator that adjusts the sound reproduced by the speakers SP1 to SP4 of the sound signals of the respective channels with respect to the attenuator groups 20 and 28. ing. In addition, the memory 64 ′ includes areas (angle ranges) of reflected sound parameters to be assigned to the speakers SP1 to SP4 with respect to the direction θ of the front of the sound field with respect to the surround signal generation unit 22 ′ and the echo reverb signal generation unit 30 ′. The table shown is stored. Based on the sound field direction setting information sent from the sound field direction setting unit 40, the calculation unit 66 ′ reads the attenuation amount of each attenuator and the reflection sound parameter allocation area for each of the speakers SP1 to SP4 from the memory 64 ′. And output as a command value. Instead of storing the attenuation amount and reflected sound parameter allocation area table in the memory 64 ', the calculation unit 62' calculates the attenuation amount and reflected sound parameter allocation area for the front direction θ of the sound field for each attenuator. It is also possible to set an expression, obtain the attenuation amount and the reflected sound parameter assignment area from the calculation expression according to the sound field direction setting information, and output it as a command value.
[0034]
The calculation unit 66 ′ can also correct the attenuator amount command value according to the setting information of the microphone distance D sent from the sound field direction setting unit 40. For example, as the microphone distance D becomes shorter (that is, closer to the center position 42a), the rate of change of the attenuation amount with respect to the change in the direction of the sound field of the microphone sound is reduced (or the change amount of the attenuation amount is reduced). By increasing the volume from the speaker other than the direction of the microphone 16, 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.
[0035]
A specific example of the acoustic signal system of FIG. 13 is shown in FIG. The accompaniment signals of the left and right channels are adjusted in volume by the master volumes 72 and 74 via the input amplifiers 68 and 70 in the accompaniment signal processing unit 18 and input to the accompaniment signal attenuator group 20. The accompaniment signal attenuator group 20 includes attenuator groups ATT1, ATT2 for each accompaniment sound channel. Each attenuator group ATT1, ATT2 is composed of an attenuator for each speaker SP1-SP4.
[0036]
The accompaniment signals of the left and right channels are mixed (L + R or LR) by the mixing circuit 76 in the surround signal generation unit 22 'to form one channel, and the reflected sound parameters for generating the reflected sound for each of the speakers SP1 to SP4 This is input to convolution operation circuits 78 ', 80', 82 ', 84' in which (delay time and gain) are set. The convolution operation circuits 78 ′, 80 ′, 82 ′, and 84 ′ perform a convolution operation on the input signal and the reflected sound parameter to generate a reflected sound signal (accompaniment sound surround signal) for each speaker SP1 to SP4. And output.
[0037]
The microphone signal is volume-adjusted by the microphone master volume 88 via the input amplifier 86 in the microphone signal processing unit 26 and input to the microphone signal attenuator group 28. The microphone signal attenuator group 28 includes an attenuator group ATT7 including attenuators for the speakers SP1 to SP4.
[0038]
In the echo / reverb signal generation unit 30 ', convolution operation circuits 92' and 94 'in which reflected sound parameters (delay time and gain) for generating echo / reverb sounds for the speakers SP1 to SP4 are set in the echo / reverb signal generator 30'. , 96 ′, 98 ′. The convolution operation circuits 92 ′, 94 ′, 96 ′, and 98 ′ perform the convolution operation on the input signal and the reflected sound parameter, and generate and output an echo reverb signal in each direction.
[0039]
The mixing circuit 43 adds and synthesizes the outputs of the attenuator groups ATT1, ATT2, and ATT7, the surround signal generation unit 22 ', and the echo / reverb signal generation unit 30' 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 be sounded.
[0040]
Attenuation amounts of the attenuator groups ATT1, ATT2 and ATT7 and allocation of reflected sound parameter areas to the convolution operation circuits 78 ', 80', 82 ', 84', 92 ', 94', 96 'and 98' will be described. The characteristics of the attenuation amount for each speaker SP1 to SP4 of the accompaniment sound attenuator groups ATT1 and ATT2 can be set as shown in FIG. 7 or FIG. 8, for example. The characteristics of the attenuation amount for each speaker SP1 to SP4 of the microphone signal attenuator group ATT7 can be set as shown in FIG. 10 or FIG. 11, for example.
[0041]
An example of the reflected sound distribution set in the surround signal generator 22 'is shown in FIG. A circle indicates the position of each reflected sound (virtual sound source position), and the size of the circle indicates the volume of the reflected sound. FIG. 16 shows the case where the direction of the front of the sound field is set in the direction of θ = 0 degrees. Each reflected sound is reproduced by speakers adjacent to the left and right sides. That is, the reflected sound distribution around the center position 42a of the speaker arrangement space 42 is divided into four areas A to D divided by the diagonal positions of the speakers SP1, SP2, SP3, SP4 (here, for convenience of explanation, the areas A to D have an equal angle range of 90 degrees each). The reflected sound in each of the areas A to D is reproduced by the next pair of speakers.
-Reflected sound in area A: SP1, SP2
-Reflected sound in region B: SP2, SP3
-Reflected sound in region C: SP3, SP4
-Reflected sound in area D: SP4, SP1
In this case, for each reflected sound, the localization (direction) in the circumferential direction within the corresponding region is determined by the volume ratio of the two speakers from which the sound is reproduced, and the reflected sound is determined by the sum of the volumes at both speakers. The size is determined, and the localization (distance) in the radial direction in the region is determined by the delay time (the same delay time for the reproduced sound from both speakers). In addition, as shown in FIG. 16, when the direction of the front of the sound field is set in the direction of θ = 0 degrees, the range of the angle θ of each region A to D and the angle φ of the reflected sound distribution (φ is the front of the sound field) The range of the clockwise direction with the direction being 0 degrees) is as follows.

[0042]
In order to create the surround sound field of FIG. 16, the parameters of the reflected sound (reflected sound parameters) of the next region are set in the convolution operation circuits 92 ′, 94 ′, 96 ′, and 98 ′ of FIG. .
Convolution operation circuit 78 ′ (SP1): regions D and A (φ = 135 to 315 degrees)
Convolution operation circuit 80 ′ (SP2): areas A and B (φ = 225 to 45 degrees)
Convolution operation circuit 82 '(SP3): Regions B and C (φ = 315 to 135 degrees)
Convolution operation circuit 84 ′ (SP4): regions C and D (φ = 45 to 225 degrees)
FIG. 17 shows the reflected sound distribution set in the surround signal generation unit 22 ′ when the front direction of the sound field is set in the direction of θ = 90 degrees using the same reflected sound distribution as 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.

[0043]
In order to create the surround sound field of FIG. 17, the parameters of the reflected sound (reflected sound parameters) of the next region are set in the convolution operation circuits 92 ′, 94 ′, 96 ′, and 98 ′ of FIG. .
Convolution operation circuit 78 ′ (SP1): Regions D and A (φ = 45 to 225 degrees)
Convolution operation circuit 80 ′ (SP2): areas A and B (φ = 135 to 315 degrees)
Convolution operation circuit 82 '(SP3): Regions B and C (φ = 225 to 45 degrees)
Convolution operation circuit 84 ′ (SP4): regions C and D (φ = 315 to 135 degrees)
[0044]
The above has described the case where the direction of the front of the sound field is set in the direction of θ = 0 degrees and 90 degrees. However, the sound field is assigned to convolution operation circuits 78 ', 80', 82 ', 84' for the direction of the front of the sound field. The region of the power reflection sound distribution is summarized as shown in FIG. The relationship of FIG. 18 is stored as a table in the memory 64 ′ of FIG. 14 or set as an arithmetic expression in the arithmetic unit 66 ′, so that the convolution arithmetic circuit 78 ′, It is possible to set a reflected sound parameter of the corresponding reflected sound distribution area in 80 ', 82', and 84 ', and to form a surround sound field with the set direction as the front. The echo reverb signal generation unit 30 'is also subjected to convolution operation circuits 92' and 94 according to the direction of the front of the sound field in the same manner as the reflected sound parameter setting in the surround signal generation unit 22 'described above. In ', 96' and 98 ', the reflected sound parameter of the corresponding area of the reflected sound distribution for generating the echo reverb signal can be set.
[0045]
In the above embodiment, the case where the direction of the microphone position is set as the front direction of the sound field has been described. However, the present invention can also set the direction of the sound field regardless of the microphone position. The present invention can also be applied to a system that does not use a microphone (system other than karaoke). Moreover, although the case where this invention was applied to the system which uses four speakers was demonstrated in the said embodiment, this invention is applicable to the system which uses 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 of a speaker and a signal system.
2 is a layout diagram and a block diagram showing a configuration example of a sound field direction setting unit 40 in FIG. 1. FIG.
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. 1. 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 by the karaoke apparatus of FIG. 1. FIG.
7 is a diagram showing an example of characteristics of attenuation amounts for the speakers SP1 to SP4 of the accompaniment sound attenuator groups ATT1 and ATT2 of FIG.
8 is a diagram showing another characteristic example of the attenuation amount of the accompaniment sound attenuator group attenuator group ATT1, ATT2 of FIG.
9 is a diagram showing an example of characteristics of attenuation amount for each speaker SP1 to SP4 of the surround sound attenuator group ATT3 to ATT6 of FIG.
10 is a diagram showing a characteristic example of attenuation amount for each speaker SP1 to SP4 of the microphone signal attenuator group ATT7 of FIG. 5; FIG.
11 is a diagram showing another characteristic example of the attenuation amount of the microphone signal attenuator group ATT7 of FIG. 5; FIG.
12 is a graph showing an example of the attenuation amount characteristic for each speaker SP1 to SP4 of the echo / reverb signal attenuator group ATT8 to ATT11 of FIG. 5;
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 a speaker and a signal system.
14 is a block diagram illustrating a configuration example of a control unit 44 ′ of FIG.
15 is a circuit diagram showing a specific example of the acoustic signal system of FIG. 13;
16 is a plan view for explaining a region of a reflected sound distribution assigned to each convolution operation circuit of the surround signal generation unit 22 ′ of FIG. 13;
17 shows areas of the reflected sound distribution assigned to the respective convolution operation circuits of the surround signal generation unit 22 ′ in FIG. 13 when the front direction of the sound field is changed using the same reflected sound distribution as in FIG. It is a top view to explain.
FIG. 18 is a characteristic diagram showing the relationship between the areas of the reflected sound distribution assigned to the convolution operation circuits 78 ′, 80 ′, 82 ′, 84 ′ of the surround signal generation unit 22 ′ of FIG. 13 with respect to the front direction of the sound field. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Room (appropriate space for sound reproduction), SP1 to SP4 ... Speaker, 42 ... Space surrounded by speaker, 42a ... Center position of space surrounded by speaker, 16 ... Microphone, 20, 24, 28, 32 ... Attenuator group, ATT1 to ATT11 ... attenuator group, 34 ... mixing circuit, PA1 to PA4 ... power amplifier (output path), 40 ... sound field direction setting section (sound field direction setting means), 44, 44 '... control section, 78 , 80, 82, 84, 92, 94, 96, 98, 78 ', 80', 82 ', 84', 92 ', 94', 96 ', 98' ... convolution circuit.

Claims (10)

Relative direction of the sound field formed by the reproduced sound of the speaker at the center position of the space surrounded by the speakers in the appropriate space for sound reproduction and arranged by three or more speakers Is set to be variable, and multi-channel sound signals constituting stereophonic sound are assigned to one or two or more speakers so that the sound field of the reproduced sound is formed in accordance with the set direction. A sound reproduction method for reproducing ,
The acoustic signal of the plurality of channels includes a signal picked up by a microphone in a space surrounded by the speaker, and the relative position of the microphone position from the center position of the space surrounded by the speaker is relative to the speaker arrangement. A sound reproduction method for setting the direction of the sound field accordingly.   The allocation amount of the acoustic signal of one channel to one speaker is gradually increased as the relative direction of the one speaker with respect to the set direction of the sound field approaches the direction specific to the channel of the acoustic signal. 2. The adjustment according to a relative direction of the speaker with respect to a direction specific to the channel of the acoustic signal with respect to a direction specific to the channel of the sound signal so as to increase and decrease gradually with increasing distance. Sound reproduction method. The sound reproduction method according to claim 1 or 2 , wherein a direction of the position of the microphone from a center position of a space surrounded by the speaker is set as a direction of the front of the sound field. When the distance between the center position of the space surrounded by the speakers and the microphone position is within a predetermined value, the direction of the sound field is appropriately determined with respect to the speaker arrangement regardless of the direction of the microphone position. The sound reproduction method according to any one of claims 1 to 3, wherein the direction is fixed. Depending on 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 with respect to the set direction of the sound field and the channel-specific characteristics of one acoustic signal Change the amount of change or rate of change of the allocated amount of the acoustic signal to the speaker with respect to the amount of deviation from the direction. The sound reproduction method according to any one of claims 1 to 4, wherein a change width or a change rate of the allocated amount is increased. Three or more speakers arranged in an appropriate space for sound reproduction;
Sound field direction setting means for variably setting the relative direction of the sound field formed by the reproduced sound of the speaker at the center position of the space surrounded by the speaker with respect to the speaker arrangement;
An attenuator group for adjusting the volume of the sound signals of a plurality of channels constituting the three-dimensional sound for each of the speakers;
A mixing circuit for mixing the sound signals adjusted in volume by the attenuator group with signals for the same speaker;
An output path for supplying the mixed acoustic signal for each speaker to the corresponding speaker;
The volume of the sound signal of one channel for one speaker is gradually increased as the relative direction of the one speaker with respect to the set direction of the sound field approaches the direction specific to the channel of the sound signal. The attenuation amount of the attenuator group is set 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 the acoustic signal so as to gradually decrease as the distance increases. by controlling, Ri name and a control unit constituting the stereophonic sound relative to the direction of the sound field,
The sound field direction setting means sets the direction of the sound field based on an operation of an operator;
The sound signals of the plurality of channels include a signal picked up by a microphone in a space surrounded by the speakers;
Based on an operation in which the sound field direction setting means indicates the position of the microphone in the space surrounded by the speaker, the position of the microphone from the center position of the space surrounded by the speaker is relative to the speaker arrangement. A sound reproducing device for setting the direction of the sound field according to a specific direction. Three or more speakers arranged in an appropriate space for sound reproduction;
Sound field direction setting means for variably setting the relative direction of the sound field formed by the reproduced sound of the speaker at the center position of the space surrounded by the speaker with respect to the speaker arrangement;
An attenuator group for adjusting the volume of the sound signals of a plurality of channels constituting the three-dimensional sound for each of the speakers;
A mixing circuit for mixing the sound signals adjusted in volume by the attenuator group with signals for the same speaker;
An output path for supplying the mixed acoustic signal for each speaker to the corresponding speaker;
The volume of the sound signal of one channel for one speaker is gradually increased as the relative direction of the one speaker with respect to the set direction of the sound field approaches the direction specific to the channel of the sound signal. The attenuation amount of the attenuator group is set 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 the acoustic signal so as to gradually decrease as the distance increases. by controlling, Ri name and a control unit constituting the stereophonic sound relative to the direction of the sound field,
The sound signals of the plurality of channels include a signal picked up by a microphone in a space surrounded by the speakers;
The sound field direction setting means is based on detection information of the position of the microphone in the space surrounded by the speaker, and the relative position of the microphone from the center position of the space surrounded by the speaker is relative to the speaker arrangement. A sound reproducing device for setting a direction of the sound field according to a direction . The sound reproduction device according to claim 6 or 7 , wherein the direction setting means sets the direction of the position of the microphone from the center position of the space surrounded by the speaker 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, the direction setting means determines the direction of the sound field regardless of the direction of the position of the microphone. The sound reproducing device according to any one of claims 6 to 8, wherein the sound reproducing device is set as a fixed direction determined appropriately. The controller controls the relative direction of one speaker and one sound based on the set direction of the sound field according to the distance between the center position of the space surrounded by the speakers and the position of the microphone. Change the volume or rate of change of the volume of the sound signal reproduced by the speaker with respect to the amount of deviation from the direction specific to the channel of the signal, and reduce the range or rate of change of the volume when the distance is close. 10. The sound reproduction device according to claim 6 , wherein when the distance is long, the attenuation amount of the attenuator group is controlled so as to increase the change width or change rate of the volume.

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