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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional directional
microphone, FIG. 2 is a cartridge-ridge array diagram of the same microphone, and FIG. 3 is a
circuit showing one embodiment of the directional microphone of the present invention. FIG. 4 is
a cartridge arrangement diagram of the same microphone, and FIG. 5 is a cartridge arrangement
diagram showing another example of the same microphone. 31, 32. 33 ... Unidirectional
microphone cartridge 5. ’6,8,9,12,13. ... Phase shift circuit,? , 10.15 ... addition
and subtraction circuit, 11 ° 12 ... band pass filter.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-wave
secondary sound pressure gradient directional directional microphone), and in particular, to
reduce the number of unidirectional microphone cartridges used, ', y5 + Hi / 11 ub ,. The second
object is to simplify the configuration. Generally, the directional microphones of the 2nd-order
secondary sound pressure tilt deformation have unidirectional microphone cartridges 1, 2, 3 and
4 having the same directional characteristics and the same sensitivity as shown in FIG. , 1st. The
outputs of the second unidirectional microphone cartridges 1 and 2 have different phase shift
characteristics τ1. add or subtract in the addition or subtraction [O] path 7 via the phase shift
10 circuit 6, 6 with τ 2, while The phase shift characteristics τ 1 of the phase shift circuits 5
and 6 described above are the outputs of the fourth unidirectional micro-housing cartridges 3
and 4. Phase shift characteristics τ3 different from τ2 and different from each other. Add /
subtract circuit 1 o through phase shift circuit 8.9 with τ 4. 1st month-1st. The outputs of the
second addition / subtraction class 7 and 10 have different phase-pass characteristics .tau.5. The
third add or subtract circuit @ 15 is added / subtracted via the phase shift old one path 13.14
including .tau.6 to output to the output end 16). Here, as shown in the first to fourth single u633
uni-directional microphone cartridges 1 to 4r, -J shown in FIG. 2, each directional axis is arrayed
to be l "T- (tI ridge line, 1st. The second single directional 1 '+ microphone cartridge 1 and 2 is ll!
I spaced apart through d1i, and thirdly 3. The fourth single directional + 1-,-icrophone force-The
ridges 3 and 4 are arranged via a distance @ d2, and they are in the relationship of dl> d2. Then,
since the first band pass filter 1 is for low frequencies and the second band pass filter 2 is for city
1 ^ j waves, A microphone for a low frequency band is configured by the second unidirectional
microphone cartridges 1 and 2; The fourth directional microphone cartridges 3 and 4 constitute
a microphone for a high frequency band. However, I: because the directional microphone
described above is constructed using two sets of single directional 1'1 microphone cartridges in
each of two bands of low frequency disturbance and high 17 and 4 wave bands. A total of four
unidirectional microphones "1-j need a cartridge, the structure is also complex nine, J ~, there
was a gap that it will be.
ILll'ta4 The present invention solves such conventional drawbacks, and in the following, the
present invention will be described in conjunction with the drawings of the embodiments. An
example of the present invention 7 is an example of the present invention 7; 31.32.33 in the
figure is a unidirectional microphone cartridge having the same directional characteristic and the
same sensitivity characteristic, and the first to third of these first to third ones. The unidirectional
microphone cartridges 31 and 32.33 are aligned in the same straight line with their directional
axes aligned as shown in FIG. The distance between the second single directional microphone
cartridge 31.32 is @ d1 r (and also the second one. There is a distance d2 between the third
unidirectional microphone cartridges 32.33, d,! D2. The above first one. Outputs of the second
unidirectional microphones 31, 32 · · · · Phase shift characteristics τ 4 different from each other.
Addition / subtraction lI] 1 path 7 with a phase shift 1 ul rating 5, 6 with τ 2 added /
subtracted, while The outputs of the third uni-directional microphone car, Torinoji 32.33 have
different phase shifts 5) characteristic τ 3. The addition u 7 i 5 subtraction circuit 10 adds /
subtracts via a phase shift circuit 8.9 having r 4. That (, I · 妃 1st. Outputs of the second adding
and subtracting circuits 7 and 10) J · ′ ′ r + band pass filters 11 having different band
characteristics respectively different in phase shift characteristics τ 5. 4. The τ6 is added and
subtracted by its own phase shift circuit 13.14 via the phase shift circuit 13.14 and outputted to
the output end 16, 4 in the directional microphone of such configuration the first single
directivity Microphone carto) 31 ° 32 is used to build a microphone-bar for the low frequency
band. The third unidirectional microphone cartridge 32. 33 is used to construct a car for a high
frequency band, and an electronic phone, and the single directional microphone cartridge 32 of
the second embodiment has a high frequency band 11.1 and a surrounding frequency band. The
structure is simplified because they are shared with each other. The array structure of the first to
third unidirectional microphones JJ ridges 31 to 33 may be configured as shown in FIG. As
described in the following, according to the present invention H, f, 窮 2 ー)-1 'H oriented micronano-cartridge / common use for sieving drum 1 tb' i III low 1 (7 rj work 6 frequency band)
Therefore, it has the advantage that the structure can be simplified.
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description, jps57185294
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