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The present invention relates to the improvement of a microphone device with a pointed angledirected injection M on a side. Recently, a microphone device has been devised which combines
the two microphone units tl-which are respectively identical (zero homogeneity) with each other
so as to provide a narrow angle directivity t, thereby serving as a so-called remote microphone
temple. In particular, as shown in FIG. 1, two n-directional microphone units M1ev8'fi ?are
arranged in the space IJ at a distance ? of 4-feet 0 in the direction of the sound l of the previous
issue. The output from the front microphone unit 1 is additively mixed in the mixing circuit (MIX)
directly via the ? / 2 phase shift circuit PS and the output from the rear microphone unit Mt.
Also, the equalizer circuit yrgQt-through the output terminal OUT carries the output signal. Then,
in such a configuration, assuming that the sound wave of the sound dMS Sword, et al.% Wave
person is added to the interval ? of each inter unit, each microphone unit M, Mt, the microphone
unit M of the wave blade! The output from is directly added to one end of the mixing circuit MIX,
but the output from the front microphone unit Ml is ? / 2 phase shift loop ps and ? / 2 phase
shift n curved end of the mixing circuit IJIX Comes to be able to see the sword n. As a result, the
output of the 1-footage circuit MIX is in phase and embedded-approximately doubled. On the
other hand, since the sound waves from the lateral direction are always added in phase to the
valley EndPage: 1 microphone unit M11 Mg, the l foot circuit 1. (The output at IX is tJ-1 ?. In
other words, the ordinary single-contrast process 9 with respect to the front sound S is also
superior to the sharp directivity f-H'L and the narrow-angle directivity. 'The second evil (a) # (b)
reduces the single directivity of the valley microphone unit M, IM2 alone and its single wave
number ?, and Figure 3 (a), (t +) Two microphone units 14 and 1M which are custom-designated
as shown in FIG. ?? ? ? ? ? ? ? ? ? (-tropism and nL /) l I! d wave number physical
property t is done. In this case, the curve A of ? ░ is 1 foot 1! ! The output power of J ? MIX
has a V? ? ll in the vicinity of ? 500 Hz in ll, so it has an external characteristic different from
that of ? r as shown by the curve -b of the vc concave indication failure. Gold equalizer 1giw!
The rEQk should be kept Vc, and the output of the equalizer lIli1MgQ't- will be a flat ratio .delta.n
like a curve tea of one point mm shown.
FIG. 4444 shows a specific example conventionally realized as a narrow angle directional
microphone system based on the above principle, and corresponds to MIS * ?Itr? in the figure,
respectively, the above M11M. In the condenser type microphone unit 69, P8 * t is a phase shift
circuit corresponding to P8! J, MIX, l are equalizer circuits corresponding to the IQ in bgQ11
which is a mixing circuit corresponding to the MIX. In this case, the phase shift circuit w & P 8tt
outputs the signal from the capacitor type microphone unit Mll to which the transistor Q1 is
applied to its base in opposite phase to its collector and in phase to its emitter. The signal of the
negative phase is supplied via the capacitor Czt "and in the lower region via the resistor alt to the
base of the transistor Qm constituting the mixing circuit MIXstt". The signal from the capacitor
type microphone unit Ml is marked 7111 at the base of this transistor Ql, so the transistor Q that
constitutes the equalizer circuit gQ11 is a composite signal of the signal via the capacitor C8 or
the resistor R. . Is given to the base of. Here, when the transistor Q outputs its collector output to
the output terminals ou'r and rc4, both the equalizer element gQ '' is separated from the emitter
of the transistor Q2 and the circuit for <I, Icff is accompanied. However, in the conventional
downward angle directional microphone device, the phase shift circuit INIPS, mixing circuit% 1
IX 11 k? Since the r'L-t'n transistor (WIL: J # also speaks in the case of a juvenile type) t-1 has
been published in the equalizer circuit EQtt, the 'Lon' turtle pressure of 7 1L et al. As a result of
receiving the pressure and reducing the low-pressure d production completely, there is a
hereditary defect tn that the dynamic range is narrow as a storage. In addition, the rt leads to a
large reconnaissance ratio of the circuit configuration as a whole, which leads to an increase in
quotient price, which in turn leads to a defect t ? ? 7 ░ that IA accurate adjustment work
becomes necessary. The Therefore, the present invention does not consider the '# L in the above
points, and in order to achieve no power supply such as the phase shift circuit and the mixing
w6, the improvement ratio in dynamic range x9, the circuit configuration The purpose is to
provide microphones # L with a good insertion angle directivity that has been improved to
enable and simplify alJI to be simple, compact, low price ratio, and superior 1, One embodiment
of the invention will be described in detail with reference to a concave curve.
That is, in FIG. 5, there are two unidirectional microphones that are arranged in series with a
predetermined interval tIIli to the sound ?S of the previous issue in M11 sMH, and the output
end of the front microphone unit Mll Is commonly connected to each end of the phase shift
circuit P8mtt-constituting the resistor R, 1 & the capacitor Ctt. ???? Here, each curved end of
the resistor all and the capacitor C11 is connected to correspond to both ends of the first
winding N1 on the primary side of the transformer 'rtt constituting the mixing circuit MIxtt-. The
output end of the rear microphone unit Utt is connected to the EndPage: 2 of the second side of
the primary side of the transformer T11. The curved tin of the second lens Nt is grounded in
common with the middle point of the above 10th-N. Then, the secondary l141I of the
transformer 'I'll is connected to an equalizer circuit at its lll11 end if it is -Ns, and an equalizer
element EQxskf Tari constituting an EQ ? gold structure is connected to a pair of outputs 4 OUT
1 mV C7. The above configuration is -j! Electrically, the transformer Tll is in charge of a part of
the phase shift circuit Ps ? and an I foot circuit MxX ,,. Thus, in the above configuration, the
microphone from the front microphones M1) forms the phase shift circuit Ps1t1111. ? ? The
capacitor C1 1 through the capacitor C1 1 gold through the high frequency component is Nq @
and the low frequency component through the resistor R1 + the same phase As the Tll primary
l141IVc A- 1st ? -N, 'mountain j end rc ? f! ???????? Also, in this case, since the
transformer Tll is supplied with the output from the rear microphone unit M 2 at the second @ -N
on its primary side, the result is as described above. The output of the front microphone unit
Mat7) et al., Which has been subjected to the same phase shift processing as that of the second
hiI, and the microphone unit M of the usage, and the output from the microphone unit M, Next
ll11 l @ ldl NaK will be fermented. Then, at this mixed output, compensation of a predetermined
frequency characteristic which is equivalent to the previous n is taken by an equalizer circuit
"Qtl", and it is derived to an output 410UT. In other words, this processed output is not limited to
the curved edge C shown in FIG. 3 (a) described above, and the flat frequency difference Afc
frequency characteristic is obtained only in one direction f # t (0's same). And in the same figure
(the angle angle directivity t-N is the same. That is, the above-described eye-chlorophone device
is required when combining two uni-directional microphone units to make the included angle
41ii a direction shift circuit PSII% mixing circuit MIxtt & equalizer circuit EQt + (However, the
equalizer circuit It is not always necessary, and in particular, when the processing is carried out
between the acoustic devices of the output of the microphone device, the phase shift circuit P81
@ b-processing and mixing-# MXX 11 t In the case of using a transistor Trtt in a part, it is not
necessary to supply an electric voltage to a conventional ?-port ??? semiconductor device of
a transistor ?. It is a thing.
This (2) unit, so-called dynamic type as a microphone unit, uses n as a whole of the microphone
device as a whole, and the ratio in FIG. 9 is shown in FIG. 9, and the specifics of FIG. In the case
of using the thing t, the impedance fff which is used in the condenser type microphone unit is
excluded from the bias itm'r of the solder field juvenile use of the transistor field ET so that the
wL # voltage as the room body is eliminated. If it is low pressure, the motion becomes a function
of ability, it is nVcI, but the restriction of the wL pressure is not limited VC has no ? 9. In
addition, since a single transformer T1m operates eight circuits without using the phase shift
circuit Pa, and the transistor vc which is conventionally processed as the mixing circuit MIXII, the
circuit configuration as a whole t Vcnli Tsuruhisa contributes to miniaturization and price
reduction, and makes it possible to achieve no princess. FIG. 6 shows a concrete sequence using
two capacitor type unidirectional microphone units MlleMtt ', and the phase shift circuit 1i! The
configuration of the P8tx and mixing circuit MIX21 part is the case of FIG. 5 and a colleague, and
the equalizer circuit EQmt? A direct tally circuit of a capacitor C11 and a resistor R11 is used as
the equalizer confectionery EQII '. Well, this invention is real and described above and illustrated!
There is no choice but to say that it is not limited to M, and that it is possible to change or
advance the phase with a fold that does not deviate from the spirit of the present invention.
Therefore, as described above, this 1313 V (in the case of using a phase shift circuit, mixing [gj
path, etc. to achieve an insensitivity ratio such as Eri, dynamic range improvement 1 h,
simplification of circuit configuration It is possible to provide a microphone device tt-having a
very good narrow angle directivity, which has been improved to allow reduction in size, cost
reduction, and v4 perfection existence. EndPage: 34, Fig. Th1 of a) and the first light is a large
angle 41-oriented microphone и 1111 for the gun side of the principle of ? 1-, Fig. 2 <a), (1) )
And # 4.3 (a), (b) same as the unit a mono-south microphone as a unit inward angle picture. -A
conventional narrow-use j1 homosexual microphone package: A configuration diagram showing
a specific release of a bag, Fig. 5 and Fig. 6 are a diagram of a micro-bon apparatus according to
the invention vc14. Kakura Bo j 44 I will make a drawing.
??? I # 1 v 12 t иии Proactive microphone unit, PS ? иии Phase shift circuit, 1AIX ? и и Probation
circuit, T ? и и и Transformer, RII и и и Resistance, Ctt и и и Capacitor , ItQH '... an equalizer circuit.
Attendee agent ? Yoko Takeshi Suzue EndPage: ?
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