JPS5846040B2 - Hall sound reproduction system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound reproduction system for theaters, music halls, stadiums, etc. (hereinafter referred to as halls).

FIG. 1 shows a cross section of a typical music hall.

In Figure 1, A is the stage, B is the seats on the first floor, C is the seats on the second floor, D is the ceiling, and E is the speaker installation area. A treble speaker 2 for the front passenger seat, a treble speaker 3 for the rear passenger seat on the first floor and a treble speaker 3 for the front passenger seat on the second floor, and a treble speaker 4 for the rear passenger seat on the second floor are installed.

The bass speaker 1 emits sound to all seats, but the treble speaker 2 radiates sound to the area from a to b of the first floor seats, and the treble speaker 3 radiates sound to the area from C of the first floor seats to d of the second floor seats. The high-pitched speaker 4 radiates sound to the area from e to f on the second floor audience seats.

In FIG. 1, sounds from high-pitched speakers 2 and 3 reach areas from b to C, and sounds from high-pitched speakers 3 and 4 reach from areas d to e.

In the above b-c area, the treble speaker 2
, 3, and in the d-e area, a difference in the propagation distance of sound from the high-pitched speakers 3 and 4 occurs, and this propagation distance difference causes a phase difference.

If this propagation distance difference is defined as A trough is created.

The above explanation is based on the assumption that the floor, chairs, etc. in the hall are made of materials with good sound absorption properties, there is almost no reflected sound, and direct sound is dominant. There is a reflected sound reflected by the mouth, etc., and the sound pressure never becomes 0 in the b-c area and the de-area, resulting in the sound pressure frequency characteristic shown at the mouth in FIG.

The present invention eliminates the above-mentioned conventional drawbacks and provides a sound reproduction method in which sound pressure frequency characteristics are flat even in an area where sounds from two speakers overlap.The present invention will be described below.

The feature of the present invention is that the sound absorption coefficients of the floors, chairs, etc. in the overlapping areas in FIG.

Conventionally, floors and chairs were constructed so that the sound absorption properties were uniform over the entire floor surface, but with the present invention,
- Select materials for floors, chairs, etc., and change construction methods so that the average sound absorption coefficient of floors, chairs, etc. in area e is lower than sound absorption coefficients in other areas.

Note that it is also effective to make the shape of the floor, chairs, etc. in the superimposition area irregular so that diffused reflection is as likely to occur as possible.

As mentioned above, if the sound absorption coefficient of the superimposition area where sounds from multiple speakers are superimposed is made smaller than the sound absorption coefficient of other areas, even if direct sound cancellation occurs in the superimposition area, the sound absorption coefficient of the superimposition area Reflected sound is present, and the valley in the sound pressure frequency characteristic in FIG. 2 disappears, resulting in a flat sound pressure frequency characteristic as shown by C in FIG.

According to experiments conducted by the present inventors, when the sound absorption coefficient of the superimposed area is set to 0.6 or less, the influence of reflected sound increases and the sound pressure frequency characteristic in the superimposed area becomes almost flat.

The above embodiment is an example in which one high-pitched speaker covers one service area, but due to power distribution,
Even when two or more speakers cover the same service area, similar effects can be obtained with the same configuration as in the above embodiment.

The present invention has the above-mentioned configuration, and reduces valleys in sound pressure frequency characteristics due to differences in sound reach distance in a superimposed area where sounds from a plurality of speakers are superimposed, and achieves a flat sound pressure frequency characteristic even in the superimposed area. This has the advantage of providing

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a typical music hall, and FIG. 2 is a sound pressure frequency characteristic diagram of the superimposed area in the conventional sound reproduction system and the present invention. A... Stage, B... First floor audience seats, C...
...Second floor seating, D...Ceiling, E...
...Speaker installation part, 1...Bass speaker, 2
~4...Treble speaker.

Claims (1)

[Claims] 1. In a hall sound reproduction system where multiple speakers or multiple sets of speakers installed in the hall share multiple areas within the hall, the sound absorption coefficient of the overlapping area where the multiple areas overlap is compared to that of other areas. A sound reproduction method for a hall characterized by having a sound absorption coefficient lower than that of .