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JPS5568900

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DESCRIPTION JPS5568900
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an essential portion of an
embodiment of a mixing apparatus according to the present invention, and FIG. 2 is an equivalent
circuit diagram for explaining the operation of the embodiment. is there. J ? to J3 ииииииии Jack, R ?
to R ?? иии-Axis resistance, C1 to C6 ииииииии Capacitor, Q1 to Q3 ииииииииииииииииииииииии Transistor, A user ~ A3
..... Preamplifier, VR ?. VR2 иииииии Variable resistor, Lch иии иии Left channel, Rch иии и и и Right channel,
Cch и и и и и и и Center channel, LOutsRout и и и и и и и и Output end .
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo
microphone, and in particular to a mixing device suitable for its center microphone. As is well
known, in a stereo reproduction apparatus, the center channel (Cch) is prepared in addition to
the left and right channels (Leh) and (Reh) for the microphone of this ''12-' microphone. The
microphone mixing of is done nicely. By the way, what is required in such mixing is that when
mixing the center channel (Ceh) to the left and right channels (Leh) 1 (Reh), the separation
characteristics of the left and right channels (Lch) and (Rch) 7 are not impaired. It is possible to
make effective mixing as simple as possible. However, conventionally, such a mixing device
capable of supplementing such desires has not been put into practice, and has been considered
as an urgent task. Therefore, the present invention has been conceived as a button in the
following manner, and it is an object of the present invention to provide a very good mixing
apparatus which is capable of performing center channel mixing as simply and as effectively as
possible. It is an object. One embodiment of this discussion will be described in detail with
reference to the drawings. That is, in FIG. 1, (Jl) and (Jx) are jacks to which the left and right
channels (Leh) and (Rch) microphones (not shown) are discarded, respectively, and coupling
capacitors (C1) and (C2) The transistors (Qt) constituting left and right chammel (Lch) and (Rch)
preamplifiers (A1) and (Az) via It is connected corresponding to the pace of (Q2). Here, as for the
transistors (Qr) and (Qz), the respective collectors are connected to t B (ten B) by way of the
resistors (Rr) and (Rt) in contrast, and the emitter is a resistor (Rs). Grounded through (R4)
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correspondingly, one pace. Resistors (Rs), (Rs) are correspondingly connected between the
collectors. Then, the variable resistors (VR ?), in which the collectors of the transistors (Q1) and
(Qi) become the volumes of the coupling capacitors (Cs) and (C4) and the left and right channels
(t, ah) and (Reh), The output terminals (Lout) and (Rout) of the left and right channels (Leh) and
(Reh) are connected via VR *) correspondingly. Also, (Js) is a jack to which a microphone (not
shown) of the center channel (Cch) is connected, and the front buy width sensor (A) of the center
channel (Cch) is connected via a coupling capacitor (Cs) ,) Is connected to the pace of the
transistor (C3).
Here, the transistor (C3) has its collector connected to the power supply (10B) via the resistor
(R7), its emitter connected to ground via the resistor (R8), and its resistor between the pace and
collector (R9) is connected. Further, the collector of the transistor (Qs) is bifurcated through the
coupling capacitor (C6), and it is in front of the left and right channels (Lch) and (Rch) through its
resistance (R + o) and (Rn). [Each of the transistors (Q1) and (Q2) constituting the j amplifier (A1)
and (Az) is correspondingly connected. In the above, the left and right channels (Leh). The output
terminals (Lout) and (Root) of (Reb) are connected to the speakers of the left and right channels
via main amplifiers and the like (not shown). Next, the operation of the mixing apparatus
configured as described above will be clarified by the equivalent circuit shown in FIG. That is, in
this equivalent circuit, an input signal of 81 1 + ez is applied to each positive phase input
terminal of the left and right channels (Lch), (Reb) front screw (A ?) and (A2), and each negative
phase input A feedback signal is applied from the output end to the end O via the resistors (R1
?), (Rs +) and (R2!), (R33), and the preamplifier of the same-phase input end (FIK center channel
(Ceh) It is concluded that the b mixing output (el) is added from Ax through resistors (R1 и) and
(Rso) respectively. Thus, from the output end (Lout) of the left channel (Lch), R21 + R22 / R,
multiplied by (el) a, is derived with respect to the input signal (el) of the left channel / Lch, A
component (el) multiplied by 0 ░ 03 ? ? / R, o with respect to the mix signal (el) is derived. Is
it R, 1 + R dew? Lout 61--10 e3, aR-! '-R' 2 EL x. Mixing output is obtained. Note that G is a dyne
of the center channel (Ceh) preamplifier (A3). This is based on the fact that the impedance of the
negative phase input end e of the left channel (Lch) preamplifier (AI>) can be regarded as s zero.
In addition, the mixing output is the output impedance of the resistor (Rho) and the output of the
center channel (Cch) preamplifier (A3) and the input of the negative phase input terminal of the
left tt Ii (A1) of the left channel (Leh). The ratio to the impedance (determined by the ratio, where
the mixing resistance (Rho) is increased, the left and right channels (Leh).
(Rch) is more advantageous with / 1 + of the senoson ringing properties. In the above formula,
R21 + HBR21 ?: G ? R22Rt. As a result, the mixing output is such that the input signal (el)
component of the left channel (Lch) and the input signal (e3) component of the center channel
(Cch) are output at the same level K. The first is the one that can be mixed effectively in Sung A
(Hai Shi e 1 e). Also, the relationship between the two is also true for the mixing between the
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center channel (Cch) and the right channel; / channel (Reh). Thus, each base of the transistors
(G11) and (Q2) in which Park operates the preamplifiers (AI) and (A2) for the left and right
channels (Lch) and (Rch), respectively, and two left and right channels (Lch). In addition to the
input signal of (Rch), each emitter whose input impedance can be regarded as tree isometrically a
tree of center channel (Cch) via resistance from the preamplifier (A3) of the center channel (Cch)
through each resistor. By mixing the left and right channels (Lch) and (Rch) without impairing
the separation characteristics between the left and right channels (Lch) and (Rch) at the same
level. It becomes possible to derive the mixed signal of the center channel (Cch). Right and left
channels (Leh), variable resistors (VRs) that make up the volume of (Reh), (VRs) K, left channel
(Lch) and center channel (Cch) and center channel @) and center channel You can rebuke the
output level between (Cch). Therefore, as described above in detail, according to the present
invention, it is possible to provide a very good mixing device which enables mixing of the most
unsung center channel with a simple assembly as much as possible. . The present invention is not
limited to the above-described embodiment and is not limited only to the illustrated embodiment,
and it is possible to pay the deformation of the parks without departing from the scope of the
present invention. ??????? 11 male explanations of 11)! FIG. 1 is an equivalent circuit
diagram for explaining the operation of the third embodiment of the present invention, and FIG.
2 is a circuit diagram of one embodiment of the mixing apparatus according to the present
invention. J, "-J3 / Yanok, R1 = 1 +--resistance, C1-(6-capacitor, Ql---Q3 ... transistor, A1-A3-pretype width device, VRl, VH2-variable resistor , ',', Lch ... left channel, Rcb ... right channel, Cch ...
center channel, LoutJout ... output end.
Out 11 agents Attorney Attorneys Suzue Takeshi 1 Figure A1 Lch \ \ R5 C5 "1 ~ Q1 Clv Rl LO LI
Ding A3, Cch Rs, 3, mowed Q5 Rch" ~. 4 \ J2-Q2ROUT2vR2 years old 2 figure elL history
A10UTCc version R203-Rl2 / R3 + A3R3 '' RchA2.4J '' S'g! 1, 1 Applicant Tokyo Shibaura Electric
Co., Ltd.); ииииии ?5 ░? in ('r +! ?????????????????? i ░ "one proxy * *, 4. yr
'A :! fi * 4t'Ml ?, 4 ?,-(2) Description 43) 1lla ??, 8 '(4) Application form 2nd, 6th, lii + Nonreporter, utility model registration applicant, representative agent ai ? ? ? ? ? i ? MKM? a (:
Kle / l "J" -1-1126 # 5 "l" "printout name (5743) Patent Attorney Takeo Miki 1. J j j j j j j j j j j j j j j
j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j i j j j j j j j i II j j j j j j j u j j j j j j j j. ??????
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