JPS639300A - Speaker system - Google Patents

Abstract

PURPOSE:To attain effective direction control by arranging plural speaker units nearly in a straight line, forming the set of parallel or series connection while using the center of arrangement as a reference and providing a delay means to each set so as to decrease number of units. CONSTITUTION:Speaker units 41, 42a-4na, 4nb are arranged in a nearly straight line, the unit 41 placed at the center of the arrangement has a delay means 21 which retards an input signal and the speaker 41 is driven by an amplifier 31. Sets of parallel or series connection formed by selecting each one from units suffixed by a, b except the unit 41 selected as the reference are provided respectively with a delay means and an amplifier, by which an audio signal is retarded by a proper time and reproduced. Thus, the directivity control with much effect is attained by using a few number of speaker units and delay means and amplifiers being nearly a half or below the number of the speaker units.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker stem whose directivity pattern can be varied to desired characteristics using a plurality of speaker units.

In conventional sound amplification in halls, gymnasiums, lecture halls, or outdoors, directivity control is an important issue in order to achieve a uniform sound field and prevent howling.

Conventionally, methods for controlling this directivity pattern include so-called tone coil type speakers/stem, in which multiple speaker units of the same diameter are arranged in a straight line, and delay means are provided in front of these speaker units to adjust the audio signal to an appropriate level. There is a type of speaker system that has a time delay.

Hereinafter, the above-mentioned conventional directivity control method will be explained with reference to the drawings.

FIG. 4 is a diagram showing a conventional directivity control method.

In FIG. 4, P indicates 1 a signal source, 21 to 2n delay means,
3) to 3n are amplifiers, and 41 to 4n are speaker units.

In the speaker system as described above, the delay means 21
When the amount of delay applied to ~2n is set to zero, the directivity can be made sharper than when reproduction is performed using only one speaker unit in the mid-low range using a so-called tone coil type speaker system. Further, the delay means 21 to 2n
When an appropriate delay amount is given to the speaker system, the directional characteristics of the speaker system become a function of the delay amount as well as the frequency, and the directional characteristics can be made variable.

The problem that the invention seeks to solveHowever, with a speaker system like Niyoko's,
In a tone coil type speaker/stem without delay means, it is necessary to arrange many speaker units in a long straight line in order to sharpen the directivity characteristics in the low frequency range.

In addition, if delay means are provided, a number of delay means and amplifiers equal to the number of speaker units are required.
This has the problem of resulting in an expensive speaker system.

In view of the above problems, the present invention provides a speaker system that can achieve highly effective directivity control using a relatively small number of speaker units and delay means and amplifiers that are less than half the number of speaker units. be.

Means for Solving the 6-Vane Problem In order to achieve the above object, the speaker system of the present invention arranges a plurality of speaker units in a straight line, and selects speakers from both sides with the central position of the arrangement as the base thread. Create a set by connecting units in series or parallel,
A delay means is provided for each set, and each speaker unit constituting the speaker system is driven by applying a delay amount that is substantially symmetrical with respect to the center position.

According to the above-described structure, the present invention sets the amount of delay given to the delay means such that the speaker unit located in the center is the largest and the speaker unit located on the outside is the smallest, or conversely, the speaker unit located in the center is set to the smallest or By setting the speaker units located at zero and outside to be large, the in-phase wavefront of the sound waves emitted from each speaker unit can be made smaller or larger than 18o0 with the apex angle from the center position, and more effective directivity can be achieved. control can be realized.

Go to 6-7 Example Below, regarding the speaker system of one example of the present invention,
This will be explained with reference to the drawings.

FIG. 1 shows a block diagram of a speaker system in one embodiment of the present invention. In FIG. 1, 1 is a signal source, 21 to 2n are delay means, 3) to 3n are amplifiers for amplifying input, and 41, 42 &.

42b, . . . , 4na, 4nb are speaker units. In the figure, a speaker unit 41 located at the center of the speaker array is driven by an amplifier 3) after an input signal is delayed by a delay means 21. For the other speaker units, select one speaker unit from inside the speaker unit 41 and connect them in parallel, for example, speaker units 42a and 4.
2b), driven by one delay means (eg 22) and an amplifier.

In the speaker system configured as described above, an example of the amount of delay given to each of the delay means 21 to 2n is shown in FIG. In Figure 2, each speaker unit 1-4
1. 42a, 4.2b, ....

4 na , 4 nb fJ: i + The speaker unit 41 located in the center forms a χ-J symmetrical arrangement, and the distance from the outermost speaker unit 4 nai or 4 n b color to the other speaker unit 1- is They are respectively l , p , l , . . . . Then, the amount of delay given to each speaker unit is determined by the distance 1. 1. The value is proportional to 6, .

By setting the delay amount in this way, the sound waves radiated from each speaker unit y l and the sound emitted from the speaker unit located in the center must be delayed in phase, so the in-phase wavefront is This results in a wedge-shaped wavefront shown as QOQ, which is tilted by an angle θ compared to the case without the delay means. Therefore, in low frequency reproduction, it is possible to realize sharper directivity characteristics as shown in FIG. 2B, compared to the case without the delay means.

Next, another example of the amount of delay given to each delay means 21 to 2n in FIG. 1 is shown in FIG. 3. In FIG. 3A, each speaker unit 4.1, 42 &
, 42b, -=., 4na, and 4nb are arranged symmetrically with respect to the speaker unit 41 located at the center, and the distances from the center speaker unit 41 to the song speaker units are l', 1', and 4nb, respectively.
4. It is set as t. Then, the delay amount given to each speaker unit is determined by distance 1i141', 1', l',...
The value is proportional to...

When the delay amount is set as shown in Fig. 3, the phase of the sound waves emitted from the outer speaker units will be delayed relative to the sound waves emitted from the center speaker unit 41, and the in-phase wavefront will be as shown in Figure 3. The result is a wedge-shaped wavefront shown as ', which is tilted by an angle θ' in the opposite direction to that in the case of a person in Figure 2. Therefore, in reproduction of medium and high frequencies, it is possible to achieve a broader directional characteristic as shown in FIG. 3B, and to suppress side lobes, as compared to the case without the delay means.

In Figure 1, Figure 2 A, and Figure 3, the number of speaker units is an odd number, but two or more 9-hage speaker units located in the center are arranged in parallel or with an even number. It may also be connected in series. Furthermore, in order to have a directivity characteristic in a direction perpendicular to the arrangement direction, a speaker/stem may be formed by stacking linearly arranged speakers in a matrix arrangement.

Effects of the Invention The present invention provides a set in which a plurality of speaker units are arranged in a substantially straight line, and speaker units selected from both sides of the center position are connected in parallel or in series from the center position as a reference. By creating a delay means for each set and delaying and reproducing the audio signal by an appropriate amount of time, the delay means and amplifier have a highly effective directivity control capability with less than half the number of speaker units. This makes it possible to realize a speaker system.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a speaker system according to an embodiment of the present invention, Fig. 2 is a block diagram showing the delay amount of the delay means, Fig. 2B is a directional characteristic diagram, and 10-7 Fig. 3 FIG. 3B is a block diagram of the main parts of a speaker/stem in another embodiment, FIG. 3B is a directional characteristic diagram thereof, and FIG. 4 is a block diagram of a conventional speaker system. 1...Signal source, 21-2n...Delay means, 3)-3n...Amplifier, 41.42a-4na
, 42b to 4nb...Speaker unit.

Claims (5)

[Claims] (1) Arrange multiple speaker units in a substantially straight line,
When the number of speaker units is odd, the speaker unit located at the center is used as the reference plane, and when the number of speaker units is even, the boundary plane separating the two speaker units located at the center is used as the reference plane. A plurality of sets are created by connecting speaker units in parallel or series, which are selected sequentially from the center to the outside from two speaker unit groups located on both sides, and a delay means is provided for each set, and each speaker unit A speaker system characterized in that the speaker system is configured to be driven by applying a delay amount that is substantially symmetrical with respect to the position of a central speaker unit. (2) The speaker system according to claim 1, wherein when the number of speaker units arranged in a straight line is an odd number, one delay means is provided for the speaker unit located at the center. (3) The amount of delay given to the delay means is the smallest for the set of speaker units located in the center, and is increased for the set of speaker units located on the outer side. The speaker system described in section. (4) The amount of delay given to the delay means is the largest for the set of speaker units located in the center, and is smaller for the set of speaker units located on the outer side. The speaker system described in section. (5) The speaker system according to any one of claims 1 to 4, wherein a plurality of speaker unit groups arranged substantially linearly are stacked to form a matrix arrangement.