JPS61277300A - Speaker device - Google Patents

Abstract

PURPOSE:To make variable a service area of a speaker array by arranging plural speaker units of the same characteristic in one raw or in a matrix, providing a pre-stage or a rear stage delay means of respective amplifiers to connect to a computer and setting a suitable quantity of a delay. CONSTITUTION:When a main axial direction B of a directional characteristic as a speaker array is set to a direction inclined by an angle theta with respect to a main axial direction A of the directional characteristic of respective speaker units 6a-6n, a quantity of delay applied to respective delay means 2a-2n is set so as to align the wave surface fronts of acoustic waves outputted from the respective speaker units 6a-6n in a vertical plane with respect to the main axial direction B. Accordingly, peaks and bottoms of the acoustic waves outputted from the respective speaker units are emphasized to each other in the main axial direction B, while in a direction from the main axial direction B, phases of the acoustic waves outputted from the respective speaker units are not coincident but weaken each other by an interference. Thereby, the main axial direction of the directional characteristic, namely, a service area of a reproduced sound can be changed.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applied to the field of equipment acoustics for amplifying speeches and information in exhibition halls, gymnasiums, auditoriums, etc., by making the principal axis direction of the directional characteristics of reproduced sound variable. This invention relates to a speaker device for changing the service area of reproduced sound depending on the situation.

Conventional technology Traditionally, at lectures and the like held in gymnasiums and lecture halls,
In order to convey clear sound to all seats in the audience, various efforts have been made, mainly in terms of the position and angle of the speakers.

Hereinafter, an example of the above-mentioned conventional sound amplification system in an auditorium or the like will be described with reference to the drawings.

FIG. 4 shows a conventional amplification system in an auditorium. In FIG. 4, 9 is a stage, 10 is an audience seat, 20 is a stage speaker, 19 is a proscenium speaker, 21 is a stage speaker service area, and 22 is a grossenium speaker service area.

In the above-described in-auditorium amplification system, the stage speaker 2o amplifies the sound mainly for the audience seats in the front, and the proscenium speaker 19 amplifies the sound mainly for the audience seats in the back. In some cases, speakers may also be installed on the side walls of the auditorium to amplify the sound of the audience seats near the rear side wall.

Problems to be Solved by the Invention However, with the above-mentioned sound amplification system, it is difficult to control the service area of each speaker depending on the usage status of the audience seats. When about 1,000 people listen to a lecture in the front part of the auditorium, the proscenium beam power cannot be used effectively with the conventional method, and the seats in the rear part of the auditorium are mostly empty, so the sound absorption capacity decreases, and it is necessary to amplify the sound to the rear. There was a problem in that the sound from the proscenium speakers was reflected at the rear of the audience seats, reducing the sense of brightness. Furthermore, in lecture halls where there are restrictions on where the speaker system can be installed, it is difficult to uniformly amplify the sound throughout the audience seats.

In view of the above-mentioned problems, the present invention provides a speaker device that can always achieve optimal amplification depending on the usage situation of audience seats, etc., without changing the mounting position of the speaker system in lecture halls or exhibition halls such as lecture halls and gymnasiums. It is something to do.

Means for Solving the Problems In order to solve the above problems, the speaker device of the present invention uses a speaker array in which a plurality of speaker units having the same characteristics are arranged in rows or in a matrix. By providing delay means before or after each amplifier that drives the speaker unit, and by connecting these delay means to the combiator via an interface, an appropriate amount of delay can be set for each delay means according to the situation. According to the above-described configuration, the present invention sets a direction inclined by an appropriate angle with respect to the front principal axis force direction of the speaker array,
By setting the amount of delay given to each delay means so that the wavefronts of the sound waves driven from each speaker are aligned in a plane perpendicular to the tilted direction, the principal axis of the directional characteristic can be set without moving the speaker array. The direction can be corrected to a tilted direction by the appropriate angle. That is, the service area of the speaker array can be made variable.Embodiment Hereinafter, a speaker device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a speaker device in one embodiment of the present invention. In FIG. 1, 1 is an input terminal, 2 &~2n are delay means, 4 is a combiator, and 3 is an interface for connecting each delay means 2a~2n to the computer 4.

6a to 5n are amplifiers, and 6a to 6n are speaker units, respectively, τb to τ. represents the amount of delay given to each delay means 2a to 2n.

In the speaker device configured as described above, the audio signal input from the input terminal 1 is delayed by each of the delay means 21L to 2n, and then sent to each of the speaker units 6a to an by the driving amplifiers 5a to 5n. Drive. Here, the amount of delay given to each delay means 51L to 5n is determined as follows. Now, if the main axis direction B of the directional characteristics of the speaker array is set to be inclined by an angle θ with respect to the main axis direction M of the directional characteristics of each speaker unit 6a to 6n, in a plane perpendicular to the main axis direction B, The amount of delay given to each delay means 2a-2n is set so that the wavefronts of the sound waves output from each speaker unit 6&-6n are aligned.

As a result, in the main axis direction B, the peaks and troughs of the sound waves output from each speaker unit are aligned and strengthen each other, whereas in the direction 7' (near 5) from the main axis direction B, the sound waves output from each speaker unit are The phases will not be aligned and will weaken each other due to interference.In Fig. 1, each delay means 2b~
The amount of delay given to 2n is the propagation distance of the sound wave, and τb~τ
. It is shown closed. These delay amounts are calculated by the computer 4 when the angle θ is given, and then transferred to each of the delay means 2a to 2n via the interface 3.

As described above, according to this embodiment, the audio signals input to each speaker unit constituting the speaker array are transmitted from each speaker unit in a plane perpendicular to the main axis direction of the directional characteristic that is to be realized as a speaker array. By delaying the wavefronts of the output sound waves by a delay amount such that the wavefronts of the sound waves are aligned, the direction of the principal axis of the directional characteristic can be arbitrarily set without changing the installation position of the speaker array.

In this embodiment, the delay means 2a, 2b, . . . , 2n are provided at the front stage of the amplifiers 5N, 5b, .

FIG. 2 shows an example in which the present invention is applied to a loudspeaker system in an auditorium. In the figure, 7 is a proscenium speaker device,
8 is a stage speaker device.

11 is the service area for stage speaker equipment.

12 indicates the service area of the proscenium speaker device. In this embodiment, it is assumed that approximately half of the auditorium's capacity is located in the front half of the audience seats, and the professional/senior speaker system 7. The direction of the main axis of the directivity characteristics of the stage speaker device 8 is corrected to the front with respect to the original direction. Eri, proscenium beaker device 7
In addition to making effective use of the space, it is also possible to reduce the reduction in clarity caused by the reflection of sound waves emitted to the rear of the audience seats, where the sound absorption capacity is reduced due to empty seats.

FIG. 3 shows an example in which the present invention is applied to a loudspeaker system in an exhibition hall. In the figure, 13 is a first exhibition stand, 14 is a first speaker device for explaining the first exhibition stand 13, 15 is a service area of the first speaker device, 16 is a second exhibition stand,
Reference numeral 17 indicates a second speaker device for explaining the second exhibition stand, and reference numeral 18 indicates a service area of the second speaker device.

In this embodiment, the principal axes of the directivity characteristics of the speaker devices attached to the rear walls of a plurality of exhibition booths are each corrected forward. In addition, even if there are restrictions on the position or direction of installing loudspeakers, the sound from each exhibition booth can reach other exhibition booths, which can reduce the difficulty of hearing explanations. can.

Effects of the Invention The present invention provides a speaker array in which a plurality of speaker units having the same characteristics are arranged in a line or in a matrix, and in which delay means are provided at the front stage or the rear stage of each amplifier that drives each speaker unit. By controlling the amount of delay applied to the combiator via an interface connected to each delay means, it is possible to realize an excellent speaker device that can vary the main axis direction of the directional characteristic, that is, the service area of the reproduced sound. It is something.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a speaker device according to an embodiment of the present invention, FIG. 2 is a speaker arrangement diagram showing a loudspeaker system in an auditorium according to the present invention, and FIG. 3 is a loudspeaker arrangement diagram in an exhibition hall showing another embodiment of the present invention. Figure 4 is a speaker layout diagram showing a conventional amplification system in an auditorium. 2a to 2n °-°° delay means, 3°...pine interface, 4...combiator, 6&~6n
゛Old °° speaker unit, 7...Speaker device for proscenium, 8...Speaker device for stage, 11...Speaker device service area for stage, 12... ...Proscenium speaker device service area, 14°°...First speaker device, 15.18 Old...Service area, 17...
-Second speaker device. Name of agent: Patent attorney Toshio Nakao and 1 other person
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Claims (1)

[Claims] Using a speaker array in which a plurality of speaker units having the same characteristics are arranged in a line or in a matrix, a delay means is provided before or after each amplifier that drives each of the speaker units, and each of the delay means is connected via an interface. What is claimed is: 1. A speaker device comprising: a computer configured to control said computer; said computer controlling the amount of delay given to each of said delay means, thereby making the principal axis direction of said directivity variable variable;