JP4894422B2 - Sound generator - Google Patents

Description

  The present invention relates to a technique for controlling the expansion of a sound field in a hall or the like.

Sound facilities such as halls have added reverberant sounds to reduce the sound of reverberations in order to clearly convey voices such as speech as the use diversifies, and reverberations to give a sense of sound expansion at concerts, etc. Various acoustic characteristics such as acoustic characteristics are required. The control of the acoustic characteristics can be dealt with by moving a structure such as a wall constituting the hall, but it has become a large-scale device and difficult to control. Therefore, in order to easily control this acoustic characteristic, there is a method of controlling an audio signal to be emitted by performing signal processing using an FIR (Finite Impulse Response) filter. (For example, Patent Document 1)
JP-A-6-149276

  However, in the invention disclosed in Patent Document 1, it is necessary to arrange a plurality of microphones at various locations in the hall, and installation takes time. Moreover, although there is disclosure about emitting an early reflection sound of a timbre close to nature, no means for freely setting the sound transmission mode is disclosed.

  The present invention has been made in view of the above-described circumstances. In one speaker system, sound is separately emitted in the direction of the audience and the side wall of the hall, etc., and the delay and volume of each sound are changed. It is an object of the present invention to provide a sound generator capable of controlling the clarity of sound and the feeling of sound spread.

In order to solve the above-described problems, the present invention provides a sound generator that generates sound, wall surface information indicating a shape of a wall surface in an area having at least one wall surface, and audience area information indicating an audience area in the area. And storage means having installation position information indicating the position of the sound generating device in the area, and a parameter value that can be changed by an operation by an operator and that indicates how to feel sound in the audience area Parameter setting means for setting the wall surface information, the audience area information, and the installation position information from the storage means, the wall surface information read by the readout means, and the audience area information, based on said installation position information, once or reflected a plurality of times in the first sound emission path between the wall surface make direct sound to the audience area A sound emission path setting means for setting a second sound emission path for sound emission in the recorded audience area, a first delay time when the audio signal is emitted using the first sound emission path, and a first delay time. A delay / amplification factor determining means for determining a second delay time and a second amplification factor when the audio signal is emitted using the second sound emission path; The signal processing means for delaying the audio signal based on the first and second delay times determined by the rate determining means to generate the first and second signals, and the delay / amplification rate determining means determined Amplifying means for amplifying the first and second signals based on the first and second amplification factors to generate first and second amplified signals; and sound based on the first amplified signals On the basis of the second amplified signal and the first sound emitting means for emitting the sound toward the first sound emitting path. The sound had and a second sound emission unit for emitting toward the second sound emission path, said parameters, the first, when the impulse generated from a second sound emitting means, the Including a value indicating a first ratio between the total acoustic energy reaching the audience area and the acoustic energy reaching the first predetermined time, the delay / amplification rate determining means includes the first sound emission path, the first Based on the relationship between the two sound emission paths and the first predetermined time, the first and second delay times and the first delay time so that the sound wave arrival mode in the audience region corresponds to the first ratio. And providing a sound generator characterized by determining a second amplification factor.

Further, the present invention provides a sound generating device that generates sound, wall surface information indicating a shape of a wall surface in an area having at least one wall surface, audience area information indicating an audience area in the area, and in the area Storage means having installation position information indicating the position of the sound generating device, and parameter setting means for setting a parameter value indicating how to feel the sound in the audience area, the parameter being changeable by an operation by an operator Reading means for reading out the wall surface information, the audience area information and the installation position information from the storage means, the wall surface information read by the reading means, the audience area information, and the installation position Based on the information, the first sound emission path that emits sound directly to the audience area and the wall surface reflect one or more times to emit sound to the audience area. A sound emission path setting means for setting a second sound emission path; a first delay time and a first amplification factor when the audio signal is emitted using the first sound emission path; and the audio signal. Delay / amplification factor determination means for determining a second delay time and a second amplification factor when sound is emitted using the second sound emission path, and the delay / amplification factor determination unit determines the second 1. Signal processing means for delaying an audio signal based on the first and second delay times to generate first and second signals, and the first and second determined by the delay / amplification factor determining means. Amplifying means for amplifying the first and second signals based on an amplification factor to generate first and second amplified signals; and a sound based on the first amplified signal for the first sound emission path A first sound emitting means for emitting the sound toward the sound source, and a sound based on the second amplified signal. A second sound emitting means for emitting the sound toward the path, wherein the parameter is set to the audience area at a second predetermined time when an impulse is generated from the first and second sound emitting means. Including a value indicating a second ratio between the acoustic energy to reach and the acoustic energy to reach via the reflection of the wall surface at a third predetermined time, and the delay / amplification rate determining means includes the first sound emission path , Based on the relationship between the second sound emission path, the second predetermined time, and the third predetermined time, the sound wave arrival mode in the audience area corresponds to the second ratio, There is provided a sound generator characterized by determining a second delay time and the first and second amplification factors.

Further, the present invention provides a sound generating device that generates sound, wall surface information indicating a shape of a wall surface in an area having at least one wall surface, audience area information indicating an audience area in the area, and in the area Storage means having installation position information indicating the position of the sound generating device, and parameter setting means for setting a parameter value indicating how to feel the sound in the audience area, the parameter being changeable by an operation by an operator Reading means for reading out the wall surface information, the audience area information and the installation position information from the storage means, the wall surface information read by the reading means, the audience area information, and the installation position Based on the information, the first sound emission path that emits sound directly to the audience area and the wall surface reflect one or more times to emit sound to the audience area. A sound emission path setting means for setting a second sound emission path; a first delay time and a first amplification factor when the audio signal is emitted using the first sound emission path; and the audio signal. Delay / amplification factor determination means for determining a second delay time and a second amplification factor when sound is emitted using the second sound emission path, and the delay / amplification factor determination unit determines the second 1. Signal processing means for delaying an audio signal based on the first and second delay times to generate first and second signals, and the first and second determined by the delay / amplification factor determining means. Amplifying means for amplifying the first and second signals based on an amplification factor to generate first and second amplified signals; and a sound based on the first amplified signal for the first sound emission path A first sound emitting means for emitting the sound toward the sound source, and a sound based on the second amplified signal. Second sound emitting means for emitting toward the path, wherein the parameter is the total acoustic energy that reaches the audience area when an impulse is generated from the first and second sound emitting means. A value indicating a first ratio with acoustic energy reaching a first predetermined time, and reaching the audience area with acoustic energy reaching a second predetermined time and reaching a third predetermined time via reflection of the wall surface Including a value indicating a second ratio to the acoustic energy to be transmitted, and the delay / amplification rate determining means determines whether the relative increase / decrease between the first delay time and the second delay time is the first ratio. And the first relationship that increases or decreases mutually with a positive correlation with respect to the second ratio, and the relative increase or decrease between the first amplification factor and the second amplification factor is the first relationship. And a second relationship that increases or decreases with a negative correlation with respect to the second ratio. And the first and second sound emission paths, and the first, second, and third predetermined time relationships, the sound wave arrival mode in the audience area is determined by the first ratio and the first The sound generator is characterized in that the first and second delay times and the first and second amplification factors are determined so as to correspond to a ratio of two.

  In another preferred embodiment, the first and second sound emission means are array speakers having a plurality of speakers, and the sound emission path setting means controls sound emission from the speakers to control the sound emission. You may set the 1st, 2nd sound emission path | route.

  According to the present invention, a single speaker system emits sound separately in the direction of the audience and the side wall of a hall or the like, and changes the delay and volume of each sound to show the clarity and spread of the sound. A sound generator capable of controlling an impression can be provided.

  Hereinafter, an embodiment of the present invention will be described.

<Embodiment>
FIG. 1 is a block diagram showing a configuration of a sound generator 1 according to an embodiment of the present invention. First, the structure of the sound generator 1 installed in the hall will be described. The speaker 2-1 and the two speakers 2-2 are narrow directivity horn speakers that can change the direction of orientation by changing the direction of the speakers. In the audience area of the hall, each of the two speakers 2-2 emits sound on the walls on both sides of the hall (in the audience area, the walls on the left and right sides in the direction of installation of the sound generator 1, hereinafter referred to as side walls). In this way, the orientation of the speaker is controlled. Hereinafter, the sound emitted from the speaker 2-1 is referred to as a main acoustic beam, and the sound emitted from the speaker 2-2 is referred to as a side acoustic beam.

  The storage unit (storage unit) 3 listens to the shape information (wall surface information) of the wall surface of the hole where the sound generator 1 is installed, which is input from the information input unit 4, and the sound emitted from the sound generator 1 in the hole Information on the audience area indicating the area (audience area information), information on the position (coordinates, direction of the acoustic generator 1) where the acoustic generator 1 is installed (installation position information), etc. It has a room information storage area for storing information. Here, the wall surface information indicates the shape of all the wall surfaces forming the hole, but it is sufficient that the wall surface information has at least information on the shape of the wall surface of the side wall.

The operation unit (parameter setting means) 5 has a volume for setting the sound clarity and spread as parameters indicating how the sound is perceived in the audience area, and outputs each set value to the control unit 6. The control unit 6 reads and executes a program stored in a predetermined area of the storage unit 3, thereby executing wall surface information read from the room information storage area of the storage unit 3, audience area information, installation position information, Based on the set value output from the operation unit 5, the delay time of the main acoustic beam and the side acoustic beam and the amplification factor for determining the volume are calculated. For example, D (definition) ₅₀ and LF (early lateral energy fraction) are used as indexes of intelligibility and spread feeling, respectively, and the control unit 6 increases D ₅₀ in order to improve the intelligibility, thereby increasing the sense of spread. In order to increase, the delay time and the amplification factor of the main acoustic beam and the side acoustic beam are calculated so as to increase LF. Then, a delay control signal indicating the calculated delay time is output to the signal processing unit 8, and the amplifiers 7-1 and 7-2 are controlled so as to obtain the calculated amplification factor.

Here, D ₅₀ and LF will be described. D ₅₀ is expressed by the mathematical formula 1 and is the ratio of the acoustic energy up to the initial 50 ms of the impulse response to the total acoustic energy of the impulse response at a predetermined position (in the audience area in the present embodiment). It is a value that is correlated with the clarity of Then, for a given position, by reaching more acoustic energy to the initial 50ms if to increase the D _50, it is possible to improve the clarity of the sound.

  Further, LF is expressed by the mathematical formula 2 and the side of the impulse response from 5 ms to 80 ms with respect to the acoustic energy of the initial impulse response up to 80 ms at a predetermined position (audience area in the present embodiment). It is the ratio of the acoustic energy that comes from, and is a value that has been correlated with the sense of sound spread. Then, if the LF is increased by causing a large amount of acoustic energy (in this embodiment, the acoustic energy of the side acoustic beam) coming from the side to reach a predetermined position from 5 to 80 ms, The feeling of spreading can be increased.

Here, p (t) described in Equations 1 and 2 indicates an impulse response from all directions, and p _L (t) described in Equation 2 indicates an impulse response from the side.

  Furthermore, the control unit 6 causes the direction control unit 10 to connect the speaker 2-1 to the audience area of the hall based on the wall surface information read from the room information storage area of the storage unit 3, the audience area information, and the installation position information. In addition, the directivity directions of the speakers are controlled so that the two speakers 2-2 emit sound to the wall surfaces on both sides of the hall.

  The signal processing unit 8 performs delay processing on the audio signal input from the signal input unit 9 in accordance with the delay control signal output from the control unit 6 and emits the main acoustic beam as a main acoustic beam. An audio signal and a side acoustic beam audio signal to be emitted as a side acoustic beam are generated. Then, the main acoustic beam audio signal is output to the amplifier 7-1 and the side acoustic beam audio signal is output to the amplifier 7-2. Here, the side acoustic beam audio signal is signal-processed by the FIR filter so as to fill the space between the side wall multiple reflections before being output to the amplifier 7-2. Here, the FIR filter is used as the digital filter, but an IIR (Infinite Impulse Response) filter may be used, or the side acoustic beam audio signal is output to the amplifier 7-2 as it is without using the digital filter. You may make it do.

  The amplifier 7-1 amplifies the main acoustic beam audio signal output from the signal processing unit 8 with the amplification factor controlled by the control unit 6, outputs the amplified signal to the speaker 2-1, and emits it as the main acoustic beam. Similarly, the amplifier 7-2 amplifies the side acoustic beam audio signal output from the signal processing unit 8 with the amplification factor controlled by the control unit 6, outputs the amplified signal to the speaker 2-2, and emits it as a side acoustic beam. .

  Next, the operation when the sound generator 1 is installed in the hall 100 having a width of 15 m as shown in FIG. 2 will be described. As shown in the drawing, the sound generator 1 is installed in the vicinity of a wall surface 100a having a width of 15 m in the hole 100. Here, the audience position is originally the audience area 110 having a certain range as shown by the broken line in the figure. However, for the sake of simplicity, the position of the center of gravity of the audience area 110 will be described below. It is assumed that the audience position 111 is 20 m in the front direction of the sound generator 1.

When the sound generator 1 is first installed in the hall 100, information on the shape of the wall surface of the hall generated by CAD information or the like in the room information recording area of the storage unit 3 via the information input unit 4, the audience position 111 And information on the position where the sound generator 1 is installed are stored. Based on the information in the room information recording area, the control unit 6 causes the direction control unit 10 to emit the speaker 2-1 to the audience area of the hall and the two speakers 2-2 to the side walls of the hall. The direction of the speaker is controlled. Also, from the information in the room information recording area and the sound speed of 340 m / s, the time t ₀ when the main acoustic beam emitted from the speaker 2-1 reaches the audience position 111, and the side acoustic beam emitted from the speaker 2-2 is time _{t 2} to reach the time _t 1, 2 once reflected and audience position 111 to reach the audience position 111 is reflected once on the side walls and _t 3 in the _{order, t 4,,} ··· can be calculated. As an example, the state of the side acoustic beam sb2 showing a state where it is reflected twice on the side wall is shown as a two-dot chain line in FIG. From the side acoustic beam path length of 36.1 m and the sound velocity, t ₂ = 106 ms can be calculated. Similarly, t ₀ = 59 ms, t ₁ = 74 ms, t ₃ = 145 ms, and t ₄ = 186 ms can be calculated. FIG. 3 shows an impulse response sequence at the audience position 111 when the main acoustic beam and the side acoustic beam indicating the impulse signal not subjected to the delay processing and the amplification processing are emitted. The horizontal axis of the graph indicates the time elapsed since the main acoustic beam and the side acoustic beam were emitted from the speakers 2-1 and 2-2, and the vertical axis represents the volume of the impulse response. A broken line in the figure indicates an impulse response when the signal processing unit 8 convolves the side acoustic beam audio signal with the FIR filter.

Next, the operator operates the operation unit 5 to set the clarity (D ₅₀ ) and the spread feeling (LF). Then, the control unit 6 causes the signal processing unit 8 to delay the audio signal in accordance with the setting in the operation unit 5 and controls the amplification factors of the amplifiers 7-1 and 7-2. Here, in the case of performing control of the delay time and the amplification factor, a description is given of changes in D ₅₀ and LF.

  First, the case where the delay of the audio signal is controlled will be described with reference to FIGS. 4 (a) to 4 (e). 4 (a) to 4 (e) show an impulse response sequence as in FIG. 3, and the horizontal axis of the graph indicates that at least one of the main acoustic beam and the side acoustic beam emitted earlier is emitted. It shows the time that has passed since.

First, as shown in FIG. 4 (a), when swung alphabet arrival order for each impulse response of the impulse response series, during the period from t ₀ the initial impulse response A has reached t _{0 +} 50 ms is Impulse responses A to F are included, and impulse responses A to I are included between t ₀ and t ₀ +80 ms. As shown in FIG. 4B, when the main acoustic beam audio signal is delayed by 10 ms, impulse responses A to H are included between t ₀ and t ₀ +50 ms, Compared with the case where no delay processing is performed, D ₅₀ increases due to the addition of impulse responses G and H. Further, the impulse response that reaches from the side between t ₀ +5 ms and t ₀ +80 ms, that is, the impulse response corresponding to the side acoustic beam includes impulse responses B to K, which is an impulse as compared with the case where no delay processing is performed. LF also increases by adding responses J and K.

On the other hand, as shown in FIG. 4C, when the side acoustic beam audio signal is delayed by 10 ms, impulse responses A to D are included between t ₀ and t ₀ +50 ms. Compared with the case where the delay process is not performed, the impulse responses E and F are eliminated, so that D ₅₀ is decreased. The impulse response that arrives from the side between t ₀ +5 ms and t ₀ +80 ms includes impulse responses B to H, and the LF is also reduced by the absence of the impulse response I compared to the case without delay processing. Decrease.

Next, the case where the amplification factor is controlled will be described. As shown in FIG. 4 (d), by increasing the amplification factor of the main acoustic beam audio signal and decreasing the amplification factor of the side acoustic beam audio signal compared to the case of FIG. 4 (a), case of increasing the volume of relatively main sound beam increases the proportion of the acoustic energy of the main sound beam, to the total acoustic energy from the impulse response a to reach between the t ₀ to t _{0 +} 50 ms of F since the ratio of the acoustic energy increases, D ₅₀ is increased. The ratio of acoustic energy from _{t 0} from the impulse response A to reach until _t 0 + 80 ms for the acoustic energy _I, from the impulse response B arriving from the side between the t 0 + 5 ms to _t 0 + 80 ms to I Since LF decreases, LF decreases.

On the other hand, as shown in FIG. 4E, when the volume of the side acoustic beam is relatively increased, the ratio of the acoustic energy of the main acoustic beam is decreased, and t ₀ to t ₀ +50 ms with respect to the entire acoustic energy. Since the ratio of the acoustic energy of the impulse response A to F that arrives in between decreases, D ₅₀ decreases. The ratio of acoustic energy from _{t 0} from the impulse response A to reach until _t 0 + 80 ms for the acoustic energy _I, from the impulse response B arriving from the side between the t 0 + 5 ms to _t 0 + 80 ms to I Since LF increases, LF increases.

Thus, increasing the delay time of the main sound beam, D ₅₀ and LF are both increased, increasing the delay time of the side sound beams, D ₅₀ and LF is reduced together. Therefore, so that the D ₅₀ and LF is increased or decreased with a both positive correlation by controlling the delay time. On the other hand, when relatively increased as compared to the volume of the main sound beam to the volume of the side sound beams, D ₅₀ increases, LF decreases. Further, when the relatively increased as compared to the volume of the side acoustic beam to the volume of the main sound beam, D ₅₀ is reduced, LF increases. Therefore, the control of the control or amplification factor of the volume, so that the D ₅₀ and LF is increased or decreased with a negative correlation. Thus, by a combination of controlling the delay time and the amplification factor, it is possible to adjust the D ₅₀ and LF to various values may correspond to the spaciousness with various intelligibility.

For example, in the case where only the intelligibility is improved and it is not desired to change the feeling of spreading, it is only necessary to increase D ₅₀ and keep LF constant. In that case, D ₅₀ is increased by the process of delaying the audio signal for the main acoustic beam, and LF increases due to the effect. On the other hand, in order to return the LF to the original level, if the amplification factors of the amplifiers 7-1 and 7-2 are controlled so that the volume of the side acoustic beam is relatively smaller than the volume of the main acoustic beam, D ₅₀ can be further increased to reduce LF. Thus, LF becomes possible to increase only the D ₅₀ kept constant. Here, the processing for delaying the main acoustic beam audio signal is performed, but the delay processing may also be performed for the side acoustic beam audio signal. In this case, processing may be performed so that the main acoustic beam is delayed relative to the side acoustic beam.

  Each audio signal subjected to delay and amplification control is emitted as a main acoustic beam from the speaker 2-1 and as a side acoustic beam from the speaker 2-2, and as a sound corresponding to the set clarity and a sense of spread, The audience position 111 is reached.

In this way, the sound generator 1 is configured so that the shape of the wall surface of the hall to be used stored in advance in the storage unit 3 can be heard at the audience position according to the set clarity and spread. Based on the information on the audience position, the position where the sound generator 1 is installed, and the set value output from the operation unit 5, the control unit 6 uses D ₅₀ and LF as an index of intelligibility and spread feeling. The time and amplification factor are calculated, the audio signal is delayed in the signal processing unit 8, amplified in the amplifiers 7-1 and 7-2, and the main acoustic beam is directed from the speakers 2-1 and 2-2 toward the audience By emitting the side acoustic beam in the direction, it is possible to easily control the clarity and spread of the sound at the audience position 111.

  As mentioned above, although embodiment of this invention was described, this invention can be implemented in various aspects as follows.

<Modification 1>
In the embodiment, the speaker 2-1 is a narrow directivity horn speaker directed toward the audience area of the hall, and the two speakers 2-2 are narrow directivity horn speakers directed toward the side wall of the hall. However, the sound generator 11 may be configured such that these speakers are array speakers 12 and emit a main acoustic beam directed to the audience area and a side acoustic beam directed to the side wall. In this case, the phase and amplitude of the signal output from the signal processing unit 8 are controlled so that the direction of sound emitted from the array speaker 12 can be controlled, as shown in FIG. A directing control unit 18 for outputting to each of the amplifiers 17-1, 17-2,..., 17-n connected to the speakers 12-1, 12-2,. What should I do? Here, as for the direction to be directed, sound such as the shape of the wall surface of the hall where the sound generator 11 stored in the room information storage area of the storage unit 3 is installed, the audience area, the position where the sound generator 11 is installed, etc. The control part 6 should just calculate based on the information of the environment where the generator 11 was installed. At this time, not only the direction of directing but also the directing angle (expansion of the acoustic beam) may be controlled. Thereby, the effect similar to embodiment can be acquired. In addition, the main acoustic beam and the side acoustic beam in different directivity directions may be emitted by using a plurality of array speakers.

<Modification 2>
In the embodiment, the audience position 111 is set as the position of the center of gravity of the audience area 110, but the audience position may be set at a plurality of locations in the audience area 110. In this case, the difference between the D ₅₀ determined by the clarity set by the operation unit 5 and the D ₅₀ at each listening position when the sound is emitted is calculated, and the sum of the differences between the D ₅₀ at each audience position is calculated. May be calculated by the control unit 6 so as to be minimized. In this way, since the calculation is not performed at one place but within a certain range, the set clarity can be given to a wider audience area without a sense of incongruity. Incidentally, it is sufficient to calculate the control unit 6 as in the case of D ₅₀ also LF.

<Modification 3>
In the embodiment, the sound speed is set as 340 m / s. However, as shown by the broken line in FIG. 1, the temperature sensor 11 is connected to the control unit 6, and the sound speed is adjusted based on the temperature detected by the temperature sensor 11. The control unit 6 may calculate the temperature dependency. In that case, if the temperature detected by the temperature sensor 11 is t (° C.), it may be calculated and corrected as 331.5 + 0.61 t (m / s). Thereby, it is possible to control the intelligibility and the feeling of spreading more accurately. The temperature sensor 11 may be installed at the same place as the sound generator 1 or may be installed at a place separated from the sound generator 1 such as an audience area, and the detected temperature information may be wired or wireless. May be transmitted to the control unit 6.

<Modification 4>
In the embodiment, the side acoustic beam is emitted toward the side wall of the hole. However, another side acoustic beam is directed to a direction other than the direction of the audience or the direction where the primary reflected sound reaches the audience, for example, the ceiling, the upper part of the side wall. It may be discharged toward the upper part of the rear wall. This makes it possible to control a feeling (LEV: Listener Envelopment) surrounded by a sound of reverberant sound, in addition to the intelligibility and the feeling of spreading. In addition, in order to prevent naturalness and howling, the directional axis may be dynamically moved so that the sound field structure has time variation.

<Modification 5>
In the embodiment, the intelligibility used D ₅₀ and the ratio of the initial acoustic energy up to 50 ms to the total acoustic energy of the impulse response at the audience position was used as an indicator of the intelligibility of sound, but the time of 50 ms May be changed. In this case, it may be changed by operating the operation unit 5. In this way, it is possible to test changes in the clarity of sound at various setting values, and it is possible to select an optimal setting value that suits the installed environment. Values for even _{D 50} likewise time for LF (5ms, 80ms) may be set to.

<Modification 6>
In the embodiment, D ₅₀ and LF are used as an index of intelligibility and a sense of spread. However, another index may be newly created and calculated. In this case, the program stored in a predetermined area of the storage unit 3 via the information input unit 4 may be changed to a program that can be calculated based on a new index, or the storage unit A plurality of programs may be stored in 3 and the operation unit 5 may select a program. In this way, it is possible to test changes in clarity and expansiveness using various indicators, and it is possible to select an optimal program that suits the installed environment.

<Modification 7>
In the embodiment, the sound generator 1 is installed in the hall 100 in the space closed by the wall surface, but may be installed in an area having an audience area and at least one wall surface. In this case, the main acoustic beam may be emitted to the audience area and the side acoustic beam may be emitted to the wall surface. Then, the side acoustic beam reflected on the wall surface may reach the audience area. As described above, the sound generator 1 is not limited to being installed indoors but can be installed in various places.

It is a block diagram which shows the structure of the sound generator which concerns on embodiment of this invention. It is explanatory drawing which shows the relationship between the sound generator installed in the hall, and an audience position. It is explanatory drawing which shows the impulse response sequence in an audience position when not performing a delay process. It is explanatory drawing which shows the impulse response sequence in an audience position. It is explanatory drawing which shows the impulse response sequence in the audience position at the time of performing a delay process to the main acoustic beam. It is explanatory drawing which shows the impulse response sequence in an audience position at the time of performing a delay process to a side acoustic beam. It is explanatory drawing which shows the impulse response sequence in the audience position when the volume of the main acoustic beam is relatively increased. It is explanatory drawing which shows the impulse response sequence in an audience position at the time of making the volume of a side acoustic beam relatively large. It is a block diagram which shows the structure of the sound generator which concerns on the modification 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... Sound generator, 2-1, 2-2, 12-1, 12-2, ..., 12-n ... Speaker, 3 ... Memory | storage part, 4 ... Information input part, 5 ... Operation part, 6 ... control unit, 7-1, 7-2, 17-1, 17-2, ..., 17-n ... amplifier, 8 ... signal processing unit, 9 ... signal input unit, 10 ... direction control unit, 11 ... Temperature sensor, 12 ... Array speaker, 18 ... Direction control unit, 100 ... Hall, 100a ... Hall wall surface, 110 ... Audience area, 111 ... Audience position

Claims (4)

In a sound generator that generates sound,
Memory having wall surface information indicating a shape of a wall surface in an area having at least one wall surface, audience area information indicating an audience area in the area, and installation position information indicating a position of the sound generator in the area Means,
Parameter setting means for setting a value of a parameter that can be changed by an operation by an operator and that indicates how to feel the sound in the audience area;
Reading means for reading out the wall surface information, the audience area information, and the installation position information from the storage means;
Based on the wall surface information read by the reading means, the audience area information, and the installation position information, the first sound emission path for emitting sound directly to the audience area and the wall surface once or A sound emission path setting means for setting a second sound emission path that is reflected a plurality of times and emits sound to the audience area;
A first delay time and a first amplification factor when the audio signal is emitted using the first sound emission path, and a first delay time when the audio signal is emitted using the second sound emission path. Delay / amplification factor determining means for determining a delay time of 2 and a second amplification factor;
Signal processing means for delaying the audio signal based on the first and second delay times determined by the delay / amplification factor determining means to generate first and second signals;
Amplifying means for amplifying the first and second signals based on the first and second amplification factors determined by the delay / amplification factor determining means to generate first and second amplified signals;
First sound emitting means for emitting sound based on the first amplified signal toward the first sound emitting path;
Second sound emitting means for emitting sound based on the second amplified signal toward the second sound emission path;
The parameter is a first ratio between total acoustic energy reaching the audience area and acoustic energy reaching a first predetermined time when an impulse is generated from the first and second sound emitting means. Contains the value shown,
The delay / amplification rate determining means determines whether the sound wave arrival mode in the audience area is based on the relationship between the first sound output path, the second sound output path, and the first predetermined time . The acoustic generator according to claim 1, wherein the first and second delay times and the first and second amplification factors are determined so as to correspond to a ratio. In a sound generator that generates sound,
Memory having wall surface information indicating a shape of a wall surface in an area having at least one wall surface, audience area information indicating an audience area in the area, and installation position information indicating a position of the sound generator in the area Means,
Parameter setting means for setting a value of a parameter that can be changed by an operation by an operator and that indicates how to feel the sound in the audience area;
Reading means for reading out the wall surface information, the audience area information, and the installation position information from the storage means;
Based on the wall surface information read by the reading means, the audience area information, and the installation position information, the first sound emission path for emitting sound directly to the audience area and the wall surface once or A sound emission path setting means for setting a second sound emission path that is reflected a plurality of times and emits sound to the audience area;
A first delay time and a first amplification factor when the audio signal is emitted using the first sound emission path, and a first delay time when the audio signal is emitted using the second sound emission path. Delay / amplification factor determining means for determining a delay time of 2 and a second amplification factor;
Signal processing means for delaying the audio signal based on the first and second delay times determined by the delay / amplification factor determining means to generate first and second signals;
Amplifying means for amplifying the first and second signals based on the first and second amplification factors determined by the delay / amplification factor determining means to generate first and second amplified signals;
First sound emitting means for emitting sound based on the first amplified signal toward the first sound emitting path;
Second sound emitting means for emitting sound based on the second amplified signal toward the second sound emission path;
The parameters include acoustic energy that reaches the audience area for a second predetermined time when an impulse is generated from the first and second sound emitting means, and reflection of the wall surface at a third predetermined time. Including a value indicating a second ratio to the acoustic energy reached by
The delay / amplification rate determining means determines whether the sound wave reaches the audience area based on the relationship between the first sound emission path, the second sound emission path, the second predetermined time, and the third predetermined time. The acoustic generator according to claim 1, wherein the first and second delay times and the first and second amplification factors are determined so that the aspect corresponds to the second ratio. In a sound generator that generates sound,
Memory having wall surface information indicating a shape of a wall surface in an area having at least one wall surface, audience area information indicating an audience area in the area, and installation position information indicating a position of the sound generator in the area Means,
Parameter setting means for setting a value of a parameter that can be changed by an operation by an operator and that indicates how to feel the sound in the audience area;
Reading means for reading out the wall surface information, the audience area information, and the installation position information from the storage means;
Based on the wall surface information read by the reading means, the audience area information, and the installation position information, the first sound emission path for emitting sound directly to the audience area and the wall surface once or A sound emission path setting means for setting a second sound emission path that is reflected a plurality of times and emits sound to the audience area;
A first delay time and a first amplification factor when the audio signal is emitted using the first sound emission path, and a first delay time when the audio signal is emitted using the second sound emission path. Delay / amplification factor determining means for determining a delay time of 2 and a second amplification factor;
Signal processing means for delaying the audio signal based on the first and second delay times determined by the delay / amplification factor determining means to generate first and second signals;
Amplifying means for amplifying the first and second signals based on the first and second amplification factors determined by the delay / amplification factor determining means to generate first and second amplified signals;
First sound emitting means for emitting sound based on the first amplified signal toward the first sound emitting path;
Second sound emitting means for emitting sound based on the second amplified signal toward the second sound emission path;
The parameter is a first ratio between total acoustic energy reaching the audience area and acoustic energy reaching a first predetermined time when an impulse is generated from the first and second sound emitting means. A value indicating and a value indicating a second ratio of the acoustic energy reaching the audience area at a second predetermined time and the acoustic energy reaching via a reflection of the wall surface at a third predetermined time;
The delay / amplification rate determining means has a positive correlation between the first ratio and the second ratio in the relative increase / decrease between the first delay time and the second delay time. The first relationship that increases or decreases relative to each other and the relative increase or decrease between the first amplification factor and the second amplification factor have a negative correlation with respect to the first ratio and the second ratio. Based on the second relationship that increases or decreases with each other, and the relationship between the first and second sound emission paths and the first, second, and third predetermined times, the arrival mode of the sound wave in the audience area is An acoustic generator , wherein the first and second delay times and the first and second amplification factors are determined so as to correspond to a first ratio and a second ratio . The first and second sound emitting means are array speakers having a plurality of speakers,
The sound according to any one of claims 1 to 3, wherein the sound emission path setting means controls the sound emission from the speaker to set the first and second sound emission paths. Generator.

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