JP2770622B2 - Directivity control speaker system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directivity control speaker system for controlling the directivity of a speaker system for reproducing two or more audio signals in independent service areas using a plurality of speaker units. It is.

[0002]

2. Description of the Related Art An audio signal is transmitted to a part of an acoustic space,
Various systems have been used as directivity control speaker systems that do not transmit to other parts.

Hereinafter, a directivity control speaker system in which conventional speaker units are arranged in a line will be described with reference to the drawings.

FIG. 5 shows a system diagram of the speaker system. In FIG. 5, 1 is an audio signal, 20 to 2 n are signal processing circuits such as an amplitude control or a filter corresponding to the position of a speaker unit for performing optimal directivity control, 40 to 4 n are power amplifiers, and 50 to 4 n.
5n is a speaker unit arranged in a line.

The following operation of the speaker system configured as described above will be described. The audio signal 1 to be amplified is demultiplexed and input to the signal processing circuits 20 to 2n. The signal processing circuits 20 to 2n perform signal processing on the audio signals so as to have the optimal directivity characteristics corresponding to the positions of the speaker units 50 to 5n arranged in a line. The processed signal is sent to the power amplifiers 40 to 4n, amplified, and reproduced from the speaker units 50 to 5n.

[0006] A line-shaped system has a symmetrical service area centered at the center of the speaker array. Therefore, the line array loudspeaker can be driven by the same signal at a symmetric position, so that the signal processing circuit 2
0-2n and the number of power amplifiers 40-4n can be reduced. FIG. 5 shows a case where only the left and right signal processing circuits are shared and the power amplifier circuit is not shared.

Although such a line array directivity control loudspeaker system has a longer system length, it has an advantage of realizing a constant directional characteristic from a low frequency range to a high frequency range.

[0008]

However, in the above configuration, when there are two or more audio signals to be loudspeaked, even a single system is large in size. There is a disadvantage that becomes.

FIG. 6 shows a system diagram in the case of using two audio signals side by side with two directivity control speaker systems. The system configuration is simply twice as large.

[0010] For example, if an attempt is made to increase the volume of a voice signal of 300 Hz or more into a target service area, the width of the speaker system is 1.5 to 2.0 m, which is a very large system. Even if a plurality of audio signals are to be independently amplified in adjacent service areas, the size of the speaker system makes it impossible to arrange the two systems close to each other, and the independent service areas are set close to each other. I couldn't.

The present invention has been made in view of the above-mentioned problems, and also in a line array type directional control speaker system, a plurality of audio signals can be independently amplified in adjacent service areas, and the entire system can be downsized. Is provided.

[0012]

In order to solve the above-mentioned problems, a mixing circuit is provided between a signal processing circuit and a power amplifier, and two loudspeakers are arranged to be close to each other and to increase the volume. The system is configured to mix a signal that has been subjected to signal processing in accordance with an audio signal, and to input the mixed signal to a speaker unit for reproduction.

[0013]

According to the present invention, a signal obtained by mixing two or more signal-processed audio signals is applied to a speaker unit located in an adjacent part of two or more line-shaped or planar array-type speaker systems. It is to be. Thus, even in a system in which a plurality of independent service areas are arranged in a straight line in a linear array type speaker system, the speaker units of adjacent systems can be shared, so that a speaker constituting one linear array type speaker system The same number of units can be realized without increasing the size of the system.

In the line-type speaker system, the size of the system and the size of the service area are closely related, and it is not possible to maintain two or more service areas adjacent to each other while maintaining desired characteristics. Some cases are impossible. By driving these two or more directional control loudspeaker systems with mixed signals in adjacent speaker unit groups, each system can be arranged electrically close to each other, and independent services can be provided. The area can be made very close.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a directivity control speaker system according to an embodiment of the present invention. (Fig. 1)
, 1a and 1b are audio signals that are to be amplified in independent service areas. This audio signal 1
The signals a and 1b are respectively demultiplexed and input to signal processing circuits 20a to 2na and 20b to 2nb such as an amplitude control or a filter. Most of the signals output from this signal processing circuit are input to power amplifiers 40a to 4na and 40b to 4nb.

The signal processing circuits 2 (n-1) a, 2n
The output signals of a, 2 (n-1) b and 2nb are input to mixing circuits 31 and 32, mixed and added, and then input to power amplifiers 4 (n-1) ab and 4nab. And
The power amplifiers 40a to 4na, 40b to 4nb, 4 (n-
1) The outputs of ab and 4nab are connected to and driven by speaker units 50a to 5na, 50b to 5nb, 5 (n-1) ab and 5nab arranged in a line.

The operation of the speaker system configured as described above will be described below.

When the audio signal 1a to be amplified is examined, the audio signal 1a is split and processed so that desired characteristics can be reproduced by the signal processing circuits 20a to 2na corresponding to the positions of the speakers. Regarding the directional characteristics of the line array loudspeakers, the same signal is sent to the loudspeaker units symmetrically positioned with respect to the center in order to obtain symmetrical directional characteristics about the center of the speaker unit. That is, for example, the output of the signal processing circuit 21a is input to the two power amplifiers 41a to drive the two units 51a. The same can be said for the other audio signal 1b. Therefore, if two independent loudspeakers are to be loudspeaked in an adjacent service area, the speaker units must be overlapped. Therefore, the signal processing of both channels, which is a signal to be sent to the desired overlapped portion, is caused. Circuits 20a to 2na, 2
0b-2nb output signals are mixed and power amplified,
By driving the speaker units, the speaker units can be realized without physically overlapping the speaker units with each other and without impairing the directional characteristics.

That is, in FIG.
The speakers that amplify a include speaker units 50a to 5na and 5 (n-1) ab, 5 as indicated by A.
nab, and a speaker for loudspeaking another loudspeaker signal 1b is a speaker unit 50
b to 5nb, 5 (n-1) ab and 5nab. That is, the speaker units 5 (n-1) ab, 5nab
Are driven by a signal obtained by mixing the two audio signals 1a and 1b, and are shared. (FIG. 1) uses only two speaker units in common.
More than one or more can be shared and used. By doing so, it is possible to make the service areas close to each other while maintaining the directional characteristics, and the number of speaker units to be used is reduced, so that the system can be downsized.

FIG. 2 shows an array diagram of speaker units of the linear array directivity control speaker system of the present invention. In this system, two loudspeaker signals 1a and 1b are simultaneously loudspeaked to an adjacent service area.
The outputs of the signal processing circuits a and 1b are mixed, and driven by the power-amplified signal. In this case, the service area can be approached by an amount corresponding to two speaker units.

FIG. 3 shows a speaker unit arrangement diagram of the plane arrangement directional voice control speaker system of the present invention. The surface arrangement type is a system that controls the service area not only in one direction but also in two directions, that is, in a plane. The speaker unit group 5A loudspeaks the loudspeaker signal 1a, and loudspeakers the speaker unit group 5B loudspeaker signal 1b. The shaded speaker unit group 5AB is an area where a signal obtained by mixing two audio signals is amplified. Such effects can be obtained not only in a system in which the speaker units are arranged in a line but also in a system in which the speaker units are arranged in a plane.

FIG. 4 shows a speaker system according to another embodiment of the present invention in which there are three channels of audio signals to be loudspeaked, and the loudspeakers are to be placed in independent service areas while approaching each other. . (Fig. 1)
In addition to the two-channel loudspeaker system shown in (1), another channel is added. That is, the added audio signal is 1c, and the signal processing circuits for processing the audio signal 1c are 20c to 2nc. The output signal of this signal processing circuit is connected to the power amplifiers 41c to 4nc to drive the speaker units 50c to 5nc. The mixer circuits 33 and 34 are circuits for mixing the respective signals of the loudspeakers 1b and 1c that have passed through the filter circuit, and the power amplifier 4 (n-1) b
c, 4nbc and amplified by the speaker unit 5 (n-
1) bc and 5nbc are driven. The operation is exactly the same as the operation shown in FIG. 1 and the same effect is obtained.

[0024]

As described above, according to the present invention, a mixing circuit is provided between a signal processing circuit and a power amplifier circuit, and a plurality of signal-processed audio signals are mixed to drive an adjacent speaker unit. This makes it possible to approach a plurality of independent service areas, which was impossible with the conventional line array type speaker system, and to reduce the size of the entire system and simplify the system configuration.

Further, by controlling a demultiplexing circuit, a signal processing circuit, and a mixing circuit by a computer,
The distance from the speaker to the service area, the distance between the service areas, the directivity, and the like can be freely and immediately controlled according to the purpose.

[Brief description of the drawings]

FIG. 1 is a system diagram of an embodiment of a linear directivity control speaker system according to the present invention.

FIG. 2 is a layout diagram of a speaker unit in one embodiment of the linear directivity control speaker system of the present invention.

FIG. 3 is a layout diagram of speaker units in one embodiment of the planar directivity control speaker system of the present invention.

FIG. 4 is a system diagram of a second embodiment of the directivity control speaker system of the present invention.

FIG. 5 is a system diagram of a conventional directivity control speaker system.

FIG. 6 is a system diagram of a conventional directivity control speaker system.

[Explanation of symbols]

1a, 1b, 1c Audio signal 20a to 2na, 20b to 2nb, 20c to 2nc Signal processing circuit 31, 32, 33, 34 Mixing circuit 40a to 4na, 40b to 4nb, 40c to 4nc Power amplifier 50a to 5na, 50b to 5nb , 50c-5nc Speaker unit

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-68991 (JP, A) JP-A-57-50200 (JP, A) JP-A-61-277300 (JP, A) JP-A-2- 239798 (JP, A) JP-A-5-14991 (JP, A) JP-A-5-41897 (JP, A)

Claims (4)

(57) [Claims] 1. A system in which a plurality of speaker units are arranged in a line or a plane at substantially equal intervals, and a plurality of audio signals are respectively amplified to different service areas.
A directivity control speaker system, wherein a plurality of adjacent audio signals are mixed and added to and driven at a speaker unit at a boundary portion where service areas are adjacent to each other. 2. A sound signal to be loudspeaked is demultiplexed in accordance with a speaker unit group, and passed through a signal processing circuit such as an amplitude control or a filter corresponding to a speaker unit position in order to perform optimal directivity control. 2. The directivity control speaker system according to claim 1, wherein only signals corresponding to boundaries between different service areas adjacent to each other are mixed to drive speaker units at the boundaries. 3. The directivity control loudspeaker system according to claim 1, wherein one or more loudspeaker units are used as a loudspeaker unit at a boundary portion driven by the mixed and added signal. 4. The directional control speaker system according to claim 1, wherein the mixing circuit for mixing and adding is arranged in a preceding stage of all the power amplifiers, and is a system which can be controlled by a computer in a timely manner according to the application. .