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JP2005328314

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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
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DESCRIPTION JP2005328314
PROBLEM TO BE SOLVED: To provide a four-channel microphone in which a voice of an
operator, a cough and the like are not largely recorded. SOLUTION: Directional microphone units
11 to 14 corresponding to four channels of front left channel FL, front right channel FR, rear left
channel RL, rear right channel RR, directional microphones of the rear left channel and rear right
channel A cancellation circuit 30 is provided to cancel the sound signal of the in-phase
component of the units 13 and 14. The voice and cough emitted by the operator located in the
middle of the directional microphone units 13 and 14 are picked up by the microphone units 13
and 14 at substantially the same level and in the same phase. The canceled rear left and right
channel sound signals RL1 and RR1 are obtained. [Selected figure] Figure 1
マイクロホン
[0001]
The present invention relates to a microphone capable of reducing noise such as a
photographer's voice and cough in, for example, a one-point four-channel microphone for a video
camera.
[0002]
Conventionally, a four-channel microphone for recording sound signals corresponding to four
channels of the front left channel, the front right channel, the rear left channel, and the rear right
channel, for example, is configured as shown in FIG.
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FIG. 3 shows a one-point four-channel microphone for a so-called video camera provided in a
video camcorder capable of recording video and audio, and in the main body 10 of the video
camcorder, four directional microphone units 11 to 14 are provided. The four-channel
microphone 20 provided is attached.
[0003]
The directional microphone unit 11 is disposed near the front left 45 degrees when the front of
the camera is at 0 degrees, and records the sound source (FL) of the front left channel.
[0004]
The directional microphone unit 12 is disposed toward the front right 45 degrees of the camera,
and records a sound source (FR) of the front right channel.
[0005]
The directional microphone unit 13 is disposed toward the vicinity of 135 degrees from the front
to the left of the camera, and records the sound source (RL) of the rear left channel.
[0006]
The directional microphone unit 14 is disposed toward the vicinity of 135 degrees from the front
of the camera to the right, and records the sound source (RR) of the rear right channel.
[0007]
The voices recorded by the directional microphone units 11 to 14 are output as four-channel
sound signals FL, FR, RL, and RR.
[0008]
In a four-channel microphone that records sound signals corresponding to four channels, for
example, as described in Patent Document 1 below, it is proposed to obtain a four-channel
surround sound signal in which a sound source to be recorded is clarified. It is done.
Unexamined-Japanese-Patent No. 5-191887 gazette
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2
[0009]
In the video camcorder shown in FIG. 3, the photographer is on the side of the directional
microphone units 13 and 14 for the rear left and right channels (RL and RR), and usually
performs shooting while looking through the finder 15.
[0010]
For this reason, there has been a problem that voices such as voice and cough emitted by the
photographer are recorded as large noise through the microphone units 13 and 14.
[0011]
The present invention has been made in view of the above points, and its object is to provide a
microphone which is not greatly recorded by the voice of an operator (photographer) or cough.
[0012]
The microphone according to the present invention for solving the above problems comprises a
microphone unit corresponding to four channels of front left channel, front right channel, rear
left channel and rear right channel, and microphone units of the rear left channel and rear right
channel. And canceling means for canceling the sound signal of the in-phase component.
[0013]
Further, the canceling means may detect an in-phase signal of the microphone units of the rear
left channel and the rear right channel from the in-phase signal detection circuit, and output
signals of the microphone units of the rear left channel and the rear right channel. And a
subtraction circuit for subtracting each of the in-phase signals detected by the in-phase signal
detection circuit.
[0014]
In the above configuration, when the operator present on the microphone unit side of the rear
left channel and rear right channel picks up and shoots, that is, for example, shooting and
recording with a one-point 4-channel microphone attached to a video camera, Since the
photographer is located approximately halfway between the rear left channel and rear right
channel microphone units, noises such as voices and coughs emitted by the photographer are
approximately the same level as the rear left channel and rear right channel microphone units.
The sound signals of these in-phase components, which are recorded in phase, are canceled by
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the canceling means.
[0015]
As a result, in a microphone having a microphone unit corresponding to four channels, noise
such as a photographer's voice and cough can be reduced and collected.
[0016]
According to the present invention, in a microphone having a microphone unit corresponding to
four channels, noises such as voice and cough emitted by an operator located approximately
halfway between the microphone units of the rear left channel and the rear right channel are
reduced and collected. It can sound.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 shows an electric configuration and a plan layout of a directional microphone unit
according to an embodiment of the present invention applied to a video camcorder capable of
recording video and audio shown in FIG. 3, and is the same as FIG. The parts are indicated with
the same reference numerals.
[0018]
In FIG. 1, the sound recorded by the directional microphone unit 11 of the front left channel is
output from the output terminal 21O as the sound signal FL of the front left channel.
The sound recorded by the directional microphone unit 12 of the front right channel is output
from the output terminal 22O as a sound signal FR of the front right channel.
The sound recorded by the directional microphone units 13 and 14 of the rear left channel and
rear right channel is canceled by the cancellation circuit 30 and the sound of the in-phase
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component is canceled and output as sound signals RL1 and RR1 of rear left channel and rear
right channel. The signals are output from the terminals 23O and 24O, respectively.
[0019]
For example, as shown in FIG. 2, the cancel circuit 30 outputs in-phase component signals from
the outputs of the directional microphone units 13 and 14 of the rear left channel (R, L) and the
rear right channel (RR), that is, the microphone unit 13 concerned. , An in-phase signal detection
circuit 31 for extracting a signal such as a voice or cough emitted by a photographer located
approximately in the middle, and an output signal of the directional microphone units 13 and 14
It is comprised by the differential amplifiers 32L and 32R (subtraction circuit) which each
subtract a signal.
[0020]
In the microphone configured as described above, the voice, cough, etc. emitted by the
photographer between the directional microphone units 13 and 14 in the rear left channel and
the rear right channel are at the same level and in the same phase. It is input to 13,14.
[0021]
As described above, the voice and cough of the photographer input to the microphone units 13
and 14 have the same sound source, so they are in-phase components.
For this reason, from the sound signals (RL, RR) collected by the directional microphone units 13
and 14 in the rear left channel and the rear right channel, the voice of the photographer's voice,
cough or the like which is the in-phase component is canceled Canceled by 30
[0022]
As a result, when 4-channel audio equipment is connected to the output terminals 21O to 24O
and reproduced, a 4-channel reproduced sound in which noises such as voice and cough emitted
by the photographer are significantly reduced can be obtained.
[0023]
The cancel means (cancel circuit 30) of the present invention is not limited to the in-phase signal
detection circuit 31 and the differential amplifiers 32L and 32R, but may be composed of other
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circuits performing similar operations.
[0024]
FIG. 1 is a configuration diagram of a four-channel microphone 20 according to an embodiment
of the present invention.
1 is a circuit diagram showing an example of an embodiment of the main part of the present
invention.
FIG. 1 is a perspective view showing an example of a video camcorder to which the present
invention is applied.
Explanation of sign
[0025]
DESCRIPTION OF SYMBOLS 10 ... Body of video camcorder, 11-14 ... Directional microphone
unit, 15 ... Finder, 20 ... 4 channel microphone, 21O-24O ... Output terminal, 30 ... Cancellation
circuit, 31 ... In-phase signal detection circuit, 32L, 32R ... Differential amplifier.
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