JPS6028480B2 - Constant directional speaker system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that the directivity characteristic decreases monotonically with respect to angle, and that the characteristic remains the same over a very wide frequency range over a considerable angle. This paper relates to a constant directional speaker system that exists in directional characteristics.

In general, in two-channel stereo, if you listen at a position that is shifted to the side from the bisector of the line connecting the speaker systems, the sound image will be biased towards the speakers closer to the listening position.

Conventionally, as a countermeasure to this problem, a system has been proposed that aims at constant directivity using an acoustic filter made of a sound-absorbing material.

However, in such a system, since the relationship between the sound source position and the filter is inappropriate, the directivity deviation with respect to frequency is not very small. There is also a proposal to obtain constant directivity by arranging the sound sources at uneven intervals, making the low-frequency directivity as sharp as possible, and moving the sidelobe generation frequency in the high-frequency range to as high a frequency as possible, but in this case, The sharpness of the main lobe itself changes depending on the frequency, so it cannot be said to have constant directivity.

Furthermore, none of the multi-way systems had fixed directivity. In order to solve this problem, the present invention provides speakers with directional characteristics that increase the output sound pressure of speakers far from the listening position and lower the output sound pressure of speakers close to the listening position. An object of the present invention is to provide a constant directional speaker system that expands the range in which a good stereo feeling can be obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments and drawings.

In Fig. 1, a speaker SP,
, SP2, and SP3 are arranged, and speakers SP4 and SP5 are arranged as Takagi side units.

The speakers SP, , SP2 are combined with a Takagi reduction filter, and the speaker SP3 is combined with a high frequency enhancement filter. Further, the speaker SP4, which is the Takagi side unit, is combined with a Takagi reinforcement filter, and the speaker SP5 is combined with a high frequency reduction filter. The distance between speakers SP and SP2 is d, the distance between speakers SP2 and S is d2, and the distance between speakers SP2 and SP4 is also the distance between speakers SP2 and SP5, and these speakers SP, SP2, SP3, The positional relationships between SP4 and SP5 are d>, d2>d3, and q>d2.

In addition, each of the above speakers SP, , SP2, SP3, SP4
, a dividing network (
(not shown) is the cross-over network, where the positional characteristics of the high frequency side and low frequency side are equalized by reversely connecting the speakers of the high frequency side or low frequency side units, and the degree of attenuation is -12 ships / ratio. t, and one that crosses at the crossover frequency is used. By configuring as described above, the speaker system of the present invention has good directivity within the constant directivity region (the range indicated by the arrow) as shown in Figure 2a, and is particularly effective at high frequencies. In the directional characteristic h, the depression (portion q indicated by the dotted line) is small and an even directional characteristic can be obtained.
In addition, each speaker SP, , SP2, SP in FIG.
When the arrangement of SP3, SP4, and SP5 is d2>d3 and ra=4, as shown in FIG. 2M, the depression q in the high frequency directivity characteristic h is large, and it can be seen that the high frequency directivity characteristic is uneven.

As described above, according to the constant directivity speaker system of the present invention, among the plurality of speaker units arranged in a straight line, the speaker unit with the highest Takagi reinforcement among the low frequency speaker units is selected as the Takagi speaker unit. By arranging the speakers in such a way that they sandwich the one with enhanced Takagi and the one with reduced high frequency, it is possible to not only obtain a speaker system with constant directional characteristics over a wide band, but also
Since the directional characteristic has a small constriction at high frequencies and a good directional characteristic is obtained, the range in which a good stereo sound can be obtained indoors is greatly increased, and it can be enjoyed by a large number of people.

It is also suitable as a loudspeaker system for outdoor halls and the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the speaker arrangement of a constant directional speaker system according to the present invention, and FIG. 2 is a diagram showing the directional characteristics of the speaker system in FIG. 1, where a is d in FIG.
2>d3 and q>d2; b is a directional characteristic diagram when the speakers are arranged so that d2>d3 and d2=d4 in FIG. 1; SP,, SP2, SP3...Low frequency side speaker unit SP4, SP5...Takagi side speaker unit. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a multi-way speaker system in which a plurality of speaker units are arranged in a straight line and are divided into bands by a dividing network to provide directivity, a speaker whose high frequency is enhanced in a low-frequency speaker unit among the plurality of speaker units. The high frequency speaker unit is arranged between a high frequency speaker unit with enhanced high frequency and a high frequency reduced high frequency speaker unit, and the high frequency speaker unit with enhanced high frequency is arranged between the low frequency speaker unit with high frequency enhanced and high frequency reduced. A constant directivity speaker system characterized by being placed between a low frequency speaker unit and a low frequency speaker unit.