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JPH0346498

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DESCRIPTION JPH0346498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
directional microphone, and more particularly to a microphone whose directivity can be
controlled electrically. 2. Description of the Related Art In conventional microphones, the sound
receiving directivity is obtained by providing an appropriate structure around the sound
receiving element. [Problems to be Solved by the Invention] In the above-described conventional
microphone, since the sound receiving directivity is determined by the mechanical structure, only
sound waves coming from a sound source in a specific direction can be received. Therefore, when
the sound source moves, it is necessary to move the position of the microphone by a mechanical
mechanism following the change in the direction of the sound source, and the speed of the sound
source tracking is limited. In addition, there is a problem that the device for moving the position
becomes large. [Means for Solving the Problems] The electrically directivity-controllable
microphone of the present invention has a plurality of sound wave detection elements, and has a
conversion means for converting an incoming sound wave into an electric signal, and the
conversion means Phase control means for changing the amplitude and phase of the output
signal, amplification means for amplifying the output signal of the phase control means, and
combining a plurality of electric signals obtained by the amplification means to obtain a single
output signal A means is provided to change the sound receiving direction following the
movement of the sound source. [Operation] In the present invention, the sound receiving
direction is changed following the movement of the sound source. Embodiments of the present
invention will now be described in detail with reference to the drawings. The figure is a block
diagram showing an embodiment of the present invention. In the figure, reference numerals 1,
2... 9 denote sound receiving elements having the same sound receiving characteristic, and the
sound receiving elements 1 to 9 meet with a plurality of sound wave detecting elements,
conversion means for converting incoming sound waves into electric signals. Are configured. A
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phase controller 10.11... 18 is a phase controller connected to each output of the sound receiving
elements 1 to 9, and the phase controllers 10 to 18 are phase control means for changing the
amplitude and phase of the output signal of the conversion means. Are configured. 19.20... 2T is
an amplifier which receives each output of the phase controller 10.11..18, and the amplifiers 19
to 27 constitute an amplifying means for amplifying the output signal of the phase control means
There is. Reference numeral 28 denotes a synthesizer for superposing the outputs of the
amplifiers 19 to 27 to obtain the desired output signal 30, which is a combination means for
superposing a plurality of electrical signals obtained by the above amplification means to obtain
a single output signal. Are configured. Reference numeral 29 denotes a control signal generation
unit which sets the phase change amount of the phase controllers 10 to 18 and the amplification
factor of the amplifiers 19 to 27 to an appropriate i value in order to obtain predetermined
sound reception directivity.
The operation of the embodiment shown in this figure will now be described. Now, when a
plurality of sound receiving elements 1 to 9 having the same characteristics are disposed in the
same plane, when the sound source is positioned in the vertical direction of the plane of the
sound receiving element 5, the detection output of the sound receiving elements 1 to 9 And the
phase difference are the same. On the other hand, when the sound source is located in a direction
different from the above direction, a difference occurs between the amplitude and the phase of
the detection output of the sound receiving elements 1 to 9. Therefore, if all phase delays added
by the phase controllers 10 to 18 are set to the same value, the maximum direction of the
reception directivity is the vertical direction of the plane on which the reception cords 1 to 9 are
arranged By setting the phase delay of each of the phase controllers 10 to 18 to a predetermined
value, it is possible to direct the maximum direction of the reception directivity in a direction
different from the vertical direction. Further, it is possible to change the turn of the receiving
directivity so as to set the amplification factors of the amplifiers 19 to 27 to different values.
Among the above, in the above embodiment, the sound receiving cords 1 to 9 have the same
characteristics and are arranged at equal intervals in the same plane as an example, but the
present invention is not limited to this. The arrangement of the sound receiving elements may be
another form, and the characteristics of each sound receiving element may be identical and long.
[Effects of the Invention] As described above, according to the present invention, the receiving
direction is changed following the movement of the sound source K, the receiving direction is
electrically changed to the maximum direction of the receiving directivity, the receiving sound
Since it is possible to change the type of directional pattern, there is an effect that control is easy
and speed can be increased.
[0002]
Brief description of the drawings
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[0003]
The figure is a block diagram showing an embodiment of the present invention.
1-9 · · · · · · Sound receiving element, 10-18 · · · Phase controller, 19-27 · · · · · · · · · · · · · · · · control
signal generator, 0 · output signal.
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