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JPH04351197

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DESCRIPTION JPH04351197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system capable of changing directivity, and more particularly to a directivity control
speaker system capable of automatically changing a service area according to the number of
listeners.
[0002]
2. Description of the Related Art Conventionally, in art museums and showrooms, etc., there is a
demand for transmitting sound only to a limited area, such as wanting that only the viewer of the
exhibit can hear the explanation. There was a huge one.
[0003]
Conventionally, as such a speaker, there has been a method of using a horn speaker, a method of
using a parametric speaker, and a method of using a phased array speaker such as a tone zone
speaker.
[0004]
By the way, in actual use, simply narrowing the directivity narrows the service area and can not
serve many listeners.
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1
Therefore, a speaker system having a sound pressure distribution that exhibits as uniform as
possible in the service area and has steep attenuation outside the service area is required.
Furthermore, there is a need for a speaker system that can freely change the directivity
according to the listener in order to prevent crosstalk with the adjacent speakers and to reduce
the noise level of the entire venue.
[0005]
Hereinafter, a conventional directivity control speaker system will be described with reference to
the drawings. FIG. 6 shows a block diagram of a method of arranging a plurality of speaker units
in an array to control directivity. Reference numeral 1 is a speaker unit, 2 is an amplifier, 3 is a
band pass filter, and 4 is a gain phase controller, which comprises a phase setter 5 and a gain
setter 6. 7 is a signal source. The directivity is changed by changing the gain and phase of each
line.
[0006]
However, in the above-mentioned conventional directivity control speaker system, in order to
change the directivity, the phase and the gain of the signal input to each speaker unit are
changed by the changeover switch or the like. It was not possible to change them automatically
according to the number of listeners.
[0007]
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present
invention to provide a speaker system capable of continuously controlling directivity according
to the number of listeners.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a plurality of speaker units and at least one of the number, distribution, and movement
speed of listeners within a predetermined maximum service area. And a service area
determination apparatus to which the output of the detection means is input, and a gain phase
controller to which the output of the service area determination apparatus is input.
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2
[0009]
According to the present invention, according to the above configuration, the detection device
first detects the number, distribution, moving speed, etc. of listeners in the maximum service area
of the speaker system.
Next, the output of the detection device is input to the service area determination device, and the
optimum coverage area is determined based on the number, distribution, moving speed, etc. of
the listeners.
Next, the output of the service area determination device is input to the gain phase controller,
and the gain and phase of the signal input to each speaker unit are determined.
[0010]
Embodiments of the present invention will be described below with reference to FIG.
[0011]
In FIG. 1, reference numeral 1 denotes a speaker unit, and nine speakers are arranged linearly at
intervals of 20 cm (only three of them are shown).
An amplifier 2 is provided for each speaker unit, 3 is a band pass filter, 4 is a gain phase
controller, and comprises a delay time (phase) setter 5 and a signal level (gain) setter 6.
7 is a signal source. A CCD camera 8 constantly monitors a maximum service area of the speaker
system and a part of the service area of the adjacent speaker system. An image captured by the
CCD camera 8 is sent to the image processing device 9. Here, the number of listeners in the
largest service area is counted. The result is input to the service area determination device 10. In
the service area determination apparatus 10, the service area is narrowed according to the rule
that the service area is narrow when the number of listeners is, for example, 0 to 5, is
intermediate when 6 to 10, and is wide when 11 or more. decide.
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[0012]
FIG. 2 shows sound pressure distribution characteristics for each service area determined in
accordance with the above rule. As apparent from the figure, the relative sound pressure level
decreases as the distance from the center of the speaker increases. The output of the service area
determination device 10 is input to the gain phase controller 4, and the gain and phase to be
input to each speaker unit are determined corresponding to the type of each service area so as to
obtain the above characteristics.
[0013]
Next, a second embodiment of the present invention will be described with reference to FIG. In
this embodiment, the maximum service area is divided into five areas 1 to 5. The number of
listeners in each area is counted by the image processing apparatus. Next, the above data is input
to the service area determination device 10. In the service area determination apparatus 10, the
number of listeners Ai in each divided area Ai, and the weighting factor Wij defined in each area
for each type of service area (SN; narrow; SM; medium; SW; wide) The coincidence degree Sj is
calculated by (Equation 2).
[0014]
[Equation 2]
[0015]
Further, Table 1 shows an example of the weighting factor.
[0016]
[Table 1]
[0017]
Then, the service area in which the degree of coincidence Sj takes the largest value is determined
as the optimum service area.
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For example, as shown in FIG. 3, if the number of listeners in each area is 1, 2, 3, 2, 1, then SN,
SM, and SW are respectively given by (Equation 3), (Equation 4), It becomes like (Equation 5).
[0018]
[Equation 3]
[0019]
[Equation 4]
[0020]
[Equation 5]
[0021]
Therefore, it is optimal to narrow the service area according to the above calculation result.
On the other hand, if the same calculation is performed when the number of listeners in each
area is 2, 3, 2, 1, 3, then SN = 4.0, SM = 4.75, SW = 4.8, and the service area is wide. It is best to
take.
If the values are the same, set a wider service area.
It goes without saying that the setting of the weight is not limited to the present embodiment,
and of course other factors such as the moving speed may be added to the determination
condition in addition to the distribution of the listener.
[0022]
Next, a third embodiment of the present invention will be described with reference to FIG.
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5
In this embodiment, fuzzy control is used to determine the service area.
In FIG. 4, 11 is a fuzzy service area determination device, and the other parts are the same as in
the first and second embodiments. The fuzzy service area determination device 11 receives the
output of the image processing device 9 and receives the number of listeners as the condition
unit, the membership function generation unit for the moving speed, the membership function
generation unit for the service area as the conclusion unit, And a fuzzy inference unit 13 which
receives the output of the fuzzy operation unit 12 and performs fuzzy inference to determine an
optimum service area.
[0023]
Next, the operation of the fuzzy service area determination apparatus 11 will be described. The
fuzzy operation unit 12 first receives the output of the image processing device 9 and represents
the number of listeners and the moving speed as a fuzzy set. The membership function is shown
in FIG. 5 (a). Here, for listeners, PS: small; PM; medium; PL; large; for speed, VS; slow; VM;
intermediate; VF; fast. Also, the membership function of the conclusion part is shown in FIG. 5
(b). Here, SN indicates that the service area is narrow, SM indicates that the service area is in the
middle, and SW indicates that the service area is wide. The fuzzy rules are shown in (Table 2).
[0024]
[Table 2]
[0025]
The fuzzy inference unit 13 performs fuzzy operations according to the fuzzy rules using the
membership functions of the condition part and the conclusion part, and the maximum value of
the combined fuzzy set is used as an output combining function, and the center of gravity of the
output combining function is fuzzy inference. Output.
In practice, it is difficult to set the service area to an arbitrary range, so the gain and phase input
to each speaker are defined for three cases of narrow, middle and wide, and the service area
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6
closest to the fuzzy inference result is provided. Determine the gain and phase as you want.
[0026]
As described above, according to the directivity control speaker system of the present invention,
an apparatus for detecting the number and distribution of listeners, and a movement speed, and
an apparatus for determining an optimum service area based thereon And, by providing a
controller that sets the gain and phase of the signal input to multiple speakers according to this
result, a directivity control speaker is realized that only spreads the sound in the optimal service
area according to the situation of the listener it can. Furthermore, using fuzzy inference for the
apparatus for determining the service area enables high-speed processing with a simple circuit
configuration.
[0027]
Brief description of the drawings
[0028]
1 is a block diagram showing the configuration of the first embodiment of the present invention
FIG. 2 is a diagram showing an example of the sound pressure distribution characteristics for the
type of service area
[0029]
3 shows an example of the division of the service area and the distribution of listeners in the
second embodiment of the present invention. FIG. 4 is a block diagram showing the configuration
of the third embodiment of the present invention. FIG. 5 shows the third embodiment of the
present invention. Diagram showing membership functions of the condition part and the
conclusion part in the three embodiments
[0030]
6 is a block diagram showing the configuration of the conventional directivity control speaker
system
[0031]
Explanation of sign
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[0032]
Reference Signs List 1 speaker unit 2 amplifier 3 band pass filter 4 gain phase controller 5 phase
setting unit 6 gain setting unit 7 signal source 8 CCD camera 9 image processing device 10
service area determination device 11 fuzzy service area determination device 12 fuzzy operation
unit 13 fuzzy inference Department
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