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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a block diagram, and FIG. 2 is a circuit diagram of one embodiment. ?????????
????????????? Ett 2 и и и и и и и и и и и и и и и и и и и и и и и Preamplifier, 4 и и и и и и и remote
control switch circuit, 5 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и . Ma 1 Ma "U, 117-5-11llj! 364 "one first base--ko + 11 L-J one 59-
[Detailed description of the invention] When using an electret microphone in a juice 11 bubbler
such as a tape recorder, bias-resistance is not particularly provided, and connection to a motor
source through a remote circuit to obtain power from it 1i ! 'Mi noise is included at the time of
reproduction because of Mi induction action and sound quality is deteriorated. Also, in the case
of p & aparts that conventionally used Dynamic My Each Crophone, points of conversion 1. ??
There is a problem with II. Therefore, conventionally, in the case of using electret ma white) 4895623-02 contract = exclusive 1? company date = = black, it is necessary to separately provide
a battery for biasing the microphone. The present invention is to obtain a portable microphone of
a tape recorder equal quantity em device which eliminates the electromagnetic induction noise as
described above and which is compatible with a dynamic microphone. Hereinafter, the present
invention will be described with reference to the drawings showing an embodiment, wherein 1 is
an electret microphone unit housed in a portable microphone box + 3 ? ? ? ?-2 shown by a
dotted line, 3 is a preamplifier, 4 is a remote control A switch circuit 5, a filter circuit 5
connected between the preamplifier 3 and the remote control switch circuit 4, a tape recorder 6,
a conductor 7, a motor 8 and a power source 9 # i. Since the present invention is configured as
described above, the electromagnetic induction noise due to the current when the power supply
of the electret microphone is shared with the motor power supply 9 of the tape recorder is
eliminated by the filter circuit 5 and 48-95623-03 (2) size I am jealous and jealous. In addition,
since the filter circuit 5 is housed in the portable microphone, it is not necessary to speed up the
circuit of the tape recorder, and it can be used in the same state for a tape recorder or the like
which has conventionally used a dynamic microphone. The effect is great.
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description, jps4895623
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