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DESCRIPTION JPS5734683

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DESCRIPTION JPS5734683
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a conventional micro
switching circuit, and FIG. 2 is an embodiment of the present invention. In the figure, 11 иии builtin microphone 12, 12 и и и impedance circuit, 13 и и и impedance circuit, 14 и и и external
microphone, 15 и и и Connector, 16 иииииии Amplifier circuit. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for
switching a microphone built in a device to an external microphone without using a changeover
switch 10-. Conventionally, in the circuit for stopping the function of the built-in microphone and
switching to the external re-mike, as shown in FIG. 1, the built-in microphone is separated by
switching 15 by the switch mechanism of the microphone jack. In the switching system by the
switch mechanism, by the increase of contact resistance! l Contact failure 1->! / LJ had two
drawbacks. In the present invention, an impedance circuit sufficiently larger than the impedance
of the microphone is connected in series between the built-in microphone and the amplification
circuit, and an external microphone circuit is connected from the middle point to connect an
external microphone. The function of the internal microphone can be stopped and switched to
the external microphone. As a result, the above-mentioned drawback is solved by replacing the
one which has been conventionally performed by the changeover switch with conversion of
impedance, and a highly reliable microphone switching circuit is provided. In the present
invention, the built-in microphone and the booster circuit are connected to the impedance circuit
in an air circuit, and the second microphone having an impedance sufficiently lower than that of
the impedance circuit is connected to the middle point of the impedance circuit. , And the second
microphone is operated. Embodiments of the present invention will be described with reference
to the drawings. FIG. 2 shows an embodiment of the present invention, and an impedance circuit
12 and an impedance circuit 13 are connected in series between the built-in microphone 11 and
the amplification path 16 and the middle point thereof. , And the external microphone 14 can be
connected through the connector 15. Next, when the external microphone 14 is connected, the
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function of the internal storage microphone 11 is stopped and the operation of the external
microphone 14 is L9a. The impedance circuit 12 and the impedance circuit 13 are sufficiently
higher than the impedances of the built-in microphone 11 and the external microphone 14, and
the input impedance 10 of the amplification circuit 16 is sufficiently higher than the impedance
circuit 12 and the impedance circuit 13. When only the counterwind microphone 11 is used, the
output voltage from the microphone is supplied to the amplification circuit 16 through the
impedance circuit 12 and the impedance circuit 13 to enable 15 operations. Next, when the
external microphone 14 is connected through the connector 15, the output from the built-in
microphone is grounded with the impedance of the external microphone 14 through the
impedance circuit 12, and a large attenuation text 203 can be obtained.
The impedance of the impedance circuit 12 here is the impedance Z of the external microphone
14. ?????? In the case of Z + << Z, ?] Attenuation becomes approximately ? and 1 and it
becomes possible to stop the function by selecting a set value of Zl as appropriate short. On the
other hand, the output voltage from the external microphone 14 is supplied to the amplifier
circuit 16 through the impedance circuit 13 to enable operation. As described above, it is
understood that the function is switched from the built-in microphone 11 to the external
microphone 14 by connecting the external microphone 14 without particularly requiring a
changeover switch. As described above, the present invention is configured to connect the
external microphone to the middle point of the impedance circuit that couples the internal
microphone and the amplification circuit as described above, thereby switching the microcircuit
without using the V mechanical contact. There is an effect of making the switching circuit highly
reliable by making it possible. 4. A simple figure of FIG. 1 is an embodiment of a conventional
micro switching circuit, and FIG. 4-2 is an embodiment of the present invention. In the drawing,
11 иии built-in microphone, 12 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.
, 16 иииииии Amplifier circuit. 5 agent patent attorney Uchihara ? 5- / 5 upper pressure 1 \\-111,
his 4 ? / / / 1/6,-no, L ,. 111174 '----JL-11-11-[Y]. Five people Z ma 4683 generation-entrance
valve 1 upper circle 1 oath
11-04-2019
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