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JPS5587090

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DESCRIPTION JPS5587090
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional mixing
circuit, and FIG. 2 is a schematic view of an embodiment of the mixing circuit of the present
invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · signal path of each channel, 7, 8 ..... Mixing on, off switch.
[Detailed description of the invention] The present invention relates to a mixing circuit for mixing
signals to be mixed originally obtained by a microphone, a record player, etc. to each signal path
of a plurality of channels, and provides an excellent mixing circuit with a simple configuration. is
there. Generally, when mixing a signal obtained by a microphone or other device with a signal of
a stereo reproduction device or other plural channels, as shown in FIG. ? It is customary to first
amplify the 7p / ρ2 signal by means of the amplifier circuit 2 and to apply its output via the
resistor 3.4 to the signal path 5.6 of the valley channel. By the way, in this case, the impedance of
the signal paths 6, 6 is z5. Z6. Assuming that the values of the resistors 3 and 4 are R3 and
R4 and the output impedance of the amplifier circuit 2 is 22, the crosstalk between the signal
paths 5 and 6 is 6Z2ll (R3 + 26) .quadrature.R3 + 26-- .. (1) Z5 + Rs A parallel impedance with
Z21 (R3 + Z6) and Z211 (Rs + Z6) and Z2 (R3 + Z6) is shown. To reduce crosstalk, the value of
R5 ° R4 is 25. It should be large enough for Z6, and small enough for Z2. ところがこのように
22. Z5. If Z6 is made smaller together, the signal level supplied to the signal paths 5 and 6
becomes much smaller than the output signal level of the amplification circuit 2, and sufficient
mixing can not be obtained. Therefore, it is necessary to further increase the 3 · gain of the
amplification circuit 2 and there is a problem that the overall cost becomes extremely high. In
particular, in this type of mixing circuit conventionally used, the power supply of the amplifier
circuit 2 is turned off to turn off mixing, and there is a problem that crosstalk does not change
even in the mixing off state. . This proposal eliminates the conventional drawbacks such as the
following. When turning off mixing, the signal to be mixed is configured to be cut just before
entering the signal path of each channel, and at least In the state, it is configured such that cross-
09-05-2019
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talk between the channels hardly occurs. That is, as shown in FIG. 2, the mixing circuit of the
present invention has mixing on, off switch complete, 8 inserted in series between the resistors 3
and 4 and the signal path 6 ° 6 of each channel, respectively. When the off switch 7.8 is turned
off, the channels are completely disconnected, and crosstalk hardly occurs.
Of course mixing on. When the off switch 7.8 is on, the cross talk occurs in the same manner as
in the conventional case (--port 1), but when mixing, some crosstalk is too audible Therefore, the
effect of zero crosstalk at the time of mixing off is extremely large. As will be apparent from the
examples, according to the present invention, crosstalk between each channel can be close to
zero and still close to it at least at mixing off, which is extremely advantageous in practice.
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