close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2001005465

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2001005465
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field control method for performing control of a sound field using electroacoustic
equipment and bringing responses of control points closer to desired target characteristics.
[0002]
2. Description of the Related Art Heretofore, there has been known such a sound field control
method as disclosed in Japanese Patent Publication No. 3-97400. FIG. 2 shows a configuration
example of an apparatus for implementing the conventional sound field control method. In FIG. 2,
201 is a sound field control device, 202 is a sound field, 203, 204, 205 and 206 are control
speakers, 207 is a control point, 208 is a signal processing device, 209 is an amplifier, 210 is a
microphone, 211 and 212 , 213, 214 are acoustic transfer functions. The acoustic signal is input
to the amplifier 209, and the acoustic transfer functions 211, 212, 213, 214 between the control
speakers 203, 204, 205, 206 and the control point 207 and the amplitude of the target
characteristic by the sound field control device 201, The acoustic signal converted into the phase
characteristic is distributed to the sound field 202 and emitted from the control speakers 203,
204, 205, 206. The acoustic signals radiated from the control speakers 203, 204, 205, 206
provide a desired sound field at control points installed near the listening position in the sound
field 202.
[0003]
15-04-2019
1
As described above, even with the above-described conventional sound field control method, it is
possible to provide a desired sound field at the listening position near the control point in the
sound field.
[0004]
However, in the conventional sound field control method, by disposing a plurality of control
speakers in a distributed manner, the difference in transfer function between the listening point
and each speaker is large. There is a problem in that it is not possible to calculate good filter
characteristics for controlling the characteristics of the sound field in a wide control area to the
target characteristics, and it is not possible to expand the control area in which a clear loud
sound is obtained.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem,
and has been made to expand the control area in which an enlarged clear speech sound can be
obtained. is there.
[0006]
According to the sound field control method of the present invention, a plurality of control
speakers are disposed on the same plane in the sound field, and the input acoustic signal is
passed through the control filter so that the plurality of control points approach the target
characteristic. It is a sound field control method to be output from a speaker, and it is possible to
expand a control area where a clear loud sound can be obtained.
[0007]
Further, according to the sound field control method of the present invention, in the abovedescribed sound field control method, a plurality of speakers are disposed adjacent to each other
on a straight line in the vertical direction, and a control area where a clear loud sound can be
obtained. Can be expanded.
[0008]
Further, according to the sound field control method of the present invention, in the abovementioned sound field control method, it is used in a reverberant sound field in which the same
cross-sectional shape is long and continuous on a cylinder. It is possible to expand the control
area where the loud sound can be obtained.
15-04-2019
2
[0009]
Further, in the sound field control method of the present invention, in the above-described sound
field control method, a characteristic with less reverberation is given as a target characteristic,
and a control area in which a clear loud sound can be obtained can be expanded.
BEST MODE FOR CARRYING OUT THE INVENTION
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 shows the configuration of the embodiment of the present invention.
In FIG. 1, 101 is a sound field controller, 102 is a sound field, 103 is a control speaker, 104 is a
loudspeaker and control speaker, 105 is a control speaker, 106 is a control point, 107 is a
control area, 108, 109 110 is an amplifier, 111, 112 and 113 are control filters, 114 is a
microphone amplifier, 115 is a microphone, and 116, 117 and 118 are acoustic transfer
functions.
[0011]
Next, the operation of the above embodiment will be described.
In FIG. 1, an audio signal to be amplified in the sound field 101 is input from the microphone
115.
The input to the microphone 115 is amplified by the microphone amplifier 114 and input to the
control filters 111, 112, 113.
15-04-2019
3
Inputs to the control filters 111, 112 and 113 are given characteristics that the amplitude and
phase cancel the reverberation by the control filters 111, 112 and 113, pass through the
amplifiers 108, 109 and 110, and are used for the control speaker 103 and the loudspeakers.
The control speaker 104 and the control speaker 105 become an acoustic signal, receive the
contribution of the acoustic transfer functions 116, 117 and 118 in the sound field 102, and
reach the listening position in the control area 107.
[0012]
The control filters 111, 112 and 113 are calculated so as to cancel the reverberation component
at the control point 106 in the control area 107 and to approach the desired target
characteristics. The target characteristic is set such that the amplitudes other than the direct
sound of the transfer function 117 between the loudspeakers 104 and the control speaker 104
and the n (n is a natural number of 2 or more) control points 106 become zero.
[0013]
A target characteristic converted to the frequency domain is D, a transfer function converted to
the frequency domain is A, a coefficient of a control filter for obtaining a desired target
characteristic is H, and a response at the control point 106 is equal to the target characteristic. In
this case, D = AH. However, when the number of control filters 111, 112, 113 and the number of
control points 106 are different, the coefficient of the control filter can not be obtained directly,
so that H with minimum | D−AH | Calculated by the square method. The target characteristic D
can be reproduced at the control point 106 by the coefficient H of the control filter thus
determined, and the reverberation component at the listening position near the control point can
be reduced. The number of control points 106 may be a number that can be arranged in a grid of
10 cm in the control area 107 to be controlled.
[0014]
When the control speakers 103, 104, and 105 are arranged vertically adjacent to the control
area 107, the speaker array has wide directivity in the horizontal direction, and the control
points for a wide range of control points are provided. By forming a good control filter, it is
15-04-2019
4
possible to cancel the reverberation and expand the control area where a clear loud sound can be
obtained. At this time, the interval of the speaker array may be 0.5 m or less.
[0015]
Control loudspeakers 103, 104, and 105 are installed on the wall surface in a sound field having
the same cross-sectional shape long and continuous on the cylinder, such as a tunnel, and having
large parallel surfaces in the short side direction and long side direction. In this case, in the
acoustic transfer functions 116, 117, 118 between the control speakers 103, 104, 105 and the
control point 106, it is better to arrange the control point 106 in the short side direction and the
long side direction than the vertical direction of the sound field. Since the change on the time axis
of the initial reflection sound portion of each acoustic transfer function is small, which is
advantageous when calculating the control filters 111, 112, and 113 having the desired
characteristics, the arrangement described above It is possible to expand the control area where
a clear loud sound can be obtained.
[0016]
As described above, according to the present invention, a plurality of loudspeakers are arranged
adjacent to each other on a straight line in the vertical direction, a plurality of control points are
provided, and a characteristic with less reverberation as a target characteristic is provided. Since
the control filter is formed so as to be close to and the desired sound field is reproduced, it is
possible to obtain an advantageous effect of being able to expand the control area where a clear
loud sound can be obtained.
[0017]
Brief description of the drawings
[0018]
1 is a block diagram showing an apparatus configuration for implementing the sound field
control method according to the embodiment of the present invention.
[0019]
2 is a block diagram showing the configuration of an apparatus for implementing the
conventional sound field control method.
[0020]
15-04-2019
5
Explanation of sign
[0021]
101 Sound Field Control Device 102 Sound Field 103 Control Speaker 104 Loudspeaker and
Control Speaker 105 Control Speaker 106 Control Point 107 Control Region 108, 109, 110
Amplifier 111, 112, 113 Control Filter 114 Microphone Amplifier 115 Microphone 116, 117,
118 Sound transfer function 201 Sound field control device 202 Sound field 203, 204, 205, 206
Speaker for control 207 Control point 208 Signal processing device 209 Amplifier 210
Microphone 211, 212, 213, 214 Sound transfer function
15-04-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
description, jp2001005465
1/--страниц
Пожаловаться на содержимое документа