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DESCRIPTION JPS57131084

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DESCRIPTION JPS57131084
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the layout of a single directional
microphone, FIG. 2 shows the electrical connection of each microphone, and FIG. 3a. , B is a
directional characteristic diagram. Description of symbols, la, lb, 3a, 3b ииииииииииии Unidirectional
microphone, 2.4 ииииииии Pair microphone, 5 ииииии Microphone case, 6a, 6b иии и и и Phase shift circuit, и и и
и и и и и и mixing circuit with a variable mixing ratio mechanism.
The present invention relates to a directional microphone, and more particularly to a variable
directional microphone constructed by combining a plurality of unidirectional microphones. The
conventional one-point stereo microphones are arranged with two single directional microphone
units open at 90 ░ to 1/10 or 10 150 ░, and the output of the unit is L channel (1, CA) and L
channel respectively. A pair unit type or uni-directional microphone uni-directional microphone
unit which can be perceived as stereo by the difference between Lth and Rch as an output of
(RCA) is arranged in a 90 ░ different direction, and both unit outputs are synthesized Take the
output of th1, RtA, and Lck. There is a MID-SIDE (MS) method that obtains a sense of stereo by
the output level difference of Rtk, while as a superdirective microphone \ и ho ~ two unidirectivity-ik и ho ~-, notes, l l l m 1 I [ Ilf [Suit, months, yeah, 2 yeah, there is. However, in the
former case, the directivity is broad, and when the sound source is at a long distance, the ambient
noise 9 reflection sound is picked up to make clear sound collection impossible, and the left and
right sound sources become larger as the distance increases. There is also a drawback that the
directivity angle of the microphone can not follow because the angle is narrowed. The present
invention aims to eliminate the above-mentioned drawbacks and is characterized in that two 11
double microphones in which two unidirectional microphone units are arranged at a
predetermined angle are cascaded in a case. And superimpose the unit outputs of one of the two
microphones and the output of the other unit in opposite phases, and input the two
superimposed outputs to the mixing circuit with the mixing ratio changing mechanism and mix
them at a predetermined ratio. Thus, the variable directional microphone is characterized in that
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the directivity characteristic can be varied from wide angle to superdirectivity. Hereinafter, the
present invention will be described in detail with reference to an embodiment shown in the
drawings. FIG. 1 shows the configuration of the variable directional microphone according to the
present invention, wherein a first dual microphone in which two unidirectional microphone units
1a and 1b are arranged such that both of their directional principal axes open 120 ░ A second
dual microphone 4 in which two single directional microphone units 3a and 3b are arranged in
the same manner as the first dual microphone and microphone is prepared, and both dual
microphones 2 and 4 are cascaded. , And the output 12 of the first dual microphone unit la and
the output of the second dual microphone unit 3a are shifted as shown in FIG. It superimposes in
reverse phase via the phase circuit 6a.
In this embodiment, the output of the microphone unit 3a is converted to the opposite phase by
the phase shift circuit 6a and mixed with the output of the unit 1a, but the output of the unit 1a
may be reversed. Similarly, the output of unit 1b and the output of unit 3b are superimposed in
reverse phase via phase shift circuit 6b. Two superimposed signals C and D obtained by the dual
microphones 2 and 4 are input to the mixing circuit 1 with mixing ratio variable mechanism 7
and mixed at a desired mixing ratio (-; 1 / 'mixing circuit 7 The mixed signal is output from the
output terminals 7a and 7b of In this case, the directivity characteristic can be varied from wide
angle to superdirectivity by continuously changing the mixing ratio in the mixing circuit 7. That
is, as shown in FIGS. 3 (a) and 3 (b), the mixing ratio ? = the level of the superimposed signal /
the level of the superimposed signal C is 0.125, 0.5, 1.0. By changing it to 2.0 and 8.0, its
directivity characteristic changes. As described above, in the present invention, two unitary 91: 3
microphones in which two unidirectional microphone units are arranged at a predetermined
angle are mounted in tandem in a case, and the unit output of one unit of the two unit
microphones The directivity characteristics can be varied from wide-angle to superdirectivity by
superimposing the other unit outputs on each other in reverse phase and inputting the two
superimposed outputs to the mixing circuit with mixing ratio variable mechanism and mixing
them at a predetermined ratio Since the directivity characteristics can be varied from wide angle
to superdirectivity by electrical processing without changing the relative positions of a plurality
of microphones, the configuration is large and the configuration is not complicated, and the size
is small. Effectiveness, which can be ! -Have fruits in the river.
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