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JP2005328403

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005328403
PROBLEM TO BE SOLVED: To provide a microphone in which the sound of a front center channel
is prevented from being hollowed out and also the separation degree of each channel is secured.
SOLUTION: Directional microphone units 11 to 15 corresponding to five channels of a front left
channel FL, a front center channel FC, a front right channel FR, a rear left channel RL, and a rear
right channel RR are provided, and a front center channel (FC) The outputs of the directional
microphone unit 15 are divided into two at equal volume, and the signals are added to the output
signals of the directional microphone units 11 and 12 by the adders 25L and 25R. [Selected
figure] Figure 2
マイクロホン
[0001]
The present invention is intended to create a multi-channel sound source by creating a center
channel ahead of the front left and right channels among four channels recorded when it is
desired to emphasize and record a sound source in the front center in four channel recording. It
relates to the four-channel microphone used.
[0002]
Conventionally, in a four-channel microphone that records sound signals corresponding to four
channels of front left channel, front right channel, rear left channel, and rear right channel, for
example, as described in Patent Document 1 below, four channels are used. It has been proposed
to obtain surround audio signals.
10-05-2019
1
Unexamined-Japanese-Patent No. 5-191887 gazette
[0003]
In the conventional four-channel microphone, when importance is placed on the degree of
separation of each channel, a low dropout state occurs in the middle of each channel for a sound
source far from the microphone. On the other hand, if the sound is prevented from falling off, the
degree of separation falls.
[0004]
In addition, in order to extract the sound in the front center for multi-channel from the sound
source recorded in 4 channels, it is extracted assuming that it was recorded in a virtual front
center microphone unit or separately from the 4 channel microphone It must be recorded with
the actual front center microphone unit prepared in.
[0005]
The present invention has been made in view of the above points, and its object is to prevent the
sound in the front center channel from being hollowed out, and also ensure the degree of
separation of each channel, and for the multi-channel center channel. An object of the present
invention is to provide a microphone capable of easily extracting a sound signal.
[0006]
The microphone according to the present invention for solving the above problems includes a
directional microphone unit corresponding to five channels of front left channel, front center
channel, front right channel, rear left channel, and rear right channel, and the five channels. And
a four-channel signal circuit for generating and outputting a four-channel sound signal from an
output signal of the directional microphone unit.
[0007]
Further, the four-channel signal circuit has a circuit for equally distributing the output signals of
the directional microphone unit of the front center channel and adding them to the output
signals of the directional microphone units of the front left channel and the front right channel. It
is characterized by
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2
[0008]
In the above configuration, since the microphone units corresponding to the five channels each
use directional microphone units, the degree of separation of each channel is sufficiently
ensured.
[0009]
In addition, since the output signals of the directional center microphone unit of the front center
channel are equally distributed and added to the output signals of the directional microphone
units of the front left channel and the front right channel, the middle of the sound in the front
center Dropout is prevented.
[0010]
Also, by extracting the in-phase component from the sound signal of the front left and right
channels recorded and output by the microphone of the present invention, the sound at the front
center of multi-channel can be easily extracted.
[0011]
(1) According to the present invention, sound can be collected with the degree of separation of
each channel enhanced, and the sound in the front center is emphasized to prevent hollowing out
of the sound.
For this reason, when connected to a 4-channel audio device and reproduced, a natural
reproduced sound without discomfort can be obtained.
[0012]
In addition, the sound of the front center channel for multi-channels can be extracted extremely
easily from the sound signals of the front left and right channels recorded by the microphone of
the present invention.
[0013]
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3
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 shows the appearance of an embodiment in which the present invention is applied to a
video camcorder capable of recording video and audio.
In FIG. 1, a four-channel microphone 20 having five directional microphone units 11 to 15 is
attached to a main body 10 of the video camcorder.
[0014]
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.
[0015]
The directional microphone unit 12 is disposed near the front 45 degrees to the right of the
camera, and records the sound source (FR) of the front right channel.
[0016]
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.
[0017]
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.
[0018]
The directional microphone unit 15 is disposed toward the front of the camera at 0 degrees, and
records a front center channel sound source (FC).
[0019]
The sound signals recorded by the directional microphone units 11 to 15 are converted into 4channel sound signals by the 4-channel signal circuit shown in FIG.
10-05-2019
4
[0020]
FIG. 2 shows the electrical configuration (four-channel signal circuit) of the four-channel
microphone 20 and the planar arrangement of the directional microphone units 11-15.
In FIG. 2, the same parts as in FIG. 1 are indicated by the same reference numerals.
[0021]
25L is an adder that adds the outputs of the directional microphone units 11 and 15 of the front
left channel (FL) and the front center channel (FC), and 25R is the directivity of the front right
channel (FR) and the front center channel (FC) Of the outputs of the directional microphone units
12 and 15 and signals obtained by equally dividing the output of the directional microphone unit
15 of the front center channel (FC) into two at these adders 25L and 25R Each is configured to
be added.
[0022]
The output signal of the adder 25L is output from the output terminal 21O as the sound signal
FL1 of the front left channel.
The output signal of the adder 25R is output from the output terminal 22O as the sound signal
FR1 of the front right channel.
[0023]
The sound recorded by the directional microphone unit 13 of the rear left channel (RL) is output
from the output terminal 23O as a sound signal RL1 of the rear left channel.
[0024]
The sound recorded by the directional microphone unit 14 of the rear right channel (RR) is
output from the output terminal 24O as a sound signal RR1 of the rear right channel.
10-05-2019
5
[0025]
In the microphone configured as described above, since each of the five channel microphone
units 11 to 15 is configured as a directional microphone unit, the degree of separation of each
channel is sufficiently ensured.
[0026]
Also, the output signals of the directional center microphone unit 15 of the front center channel
(FC) are equally distributed and added to the output signals of the directional microphone units
11 and 12 of the front left channel (FL) and the front right channel (FR) Because of this, the
hollowing out of the front center sound is prevented.
[0027]
For this reason, when it is connected to a 4-channel audio device (not shown) and played back, it
will be a natural playback sound without a sense of discomfort.
[0028]
Also when extracting the sound of the front center channel (FC) for multichannel, if the in-phase
component is extracted from the sound signals FL1 and FR1 of the front left and right channels,
the directional microphone unit 15 of the original front center channel is extracted. The recorded
sound can be extracted.
[0029]
Furthermore, by using a narrow directional microphone unit using an acoustic tube as the
directional microphone unit 15 of the front center channel (FC), the degree of separation from
the front left and right channels FL and FR can be further enhanced. it can.
[0030]
FIG. 1 is a perspective view of an example embodiment of the present invention applied to a
video camcorder.
FIG. 1 is a configuration diagram of a four-channel microphone 20 according to an embodiment
of the present invention.
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Explanation of sign
[0031]
DESCRIPTION OF SYMBOLS 10 ... Main part of video camcorder, 11-15 ... Directional microphone
unit, 20 ... 4 channel microphone, 21O-24O ... Output terminal, 25L, 25R ... Adder.
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