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FIELD OF THE INVENTION This invention relates to microphone input circuits. The configuration
of the conventional example and the problems thereof A conventional microphone input circuit
having a microphone input unit for stereo (without the need for a bias power supply) and a
microphone input unit for mono (with the bias power supply) is configured as shown in FIG. It is
done. Here, 1 and 2 are stereo microphone input units, 3 is a mono microphone input unit, and
the microphone input is supplied to the mono microphone input unit 3 so that output can be
obtained for any of H, At this time, when an external input (mono) is supplied to either of the
stereo microphone input units 1 and 2, only that one is output to the output side. On the other
hand, if an external input (stereo) is supplied, instead of an input applied to the mono mic unit 3,
an input applied to the input units 1 and 2 is obtained as L and H outputs. However, in this case,
the jacks for stereo (external microphone) input units 1 and 2 and the jack for mono (internal
microphone) manpower unit 3 and three jacks are required. SUMMARY OF THE INVENTION It is
an object of the present invention to provide two jacks with the function of receiving inputs for
stereo and monaural as before. The circuit according to the present invention is a simplified
input device in which a jack with a switch is provided in at least one signal system and a plug to
which a monaural microphone is connected is a stereo type. DESCRIPTION OF THE PREFERRED
EMBODIMENT In the following, referring to an embodiment shown in FIG. 2, 11 ° 12 is a jack
with a switch, B is a contact, C is a ground portion, D, IE is a plug, A, When contacting the contact
piece of B, the contacts of A, B and E are released (electrically off). 13 in FIG. 3 is a stereo plug to
which a mono microphone is connected, a, b. While C contacts the mu, B, and C of the jack 11.12,
a and b are connected on the side of the microphone in which the circuit is connected to the plug
or to the plug. In this configuration, when the plug 13 is inserted into the jack 11, the B and E are
open, and the microphone connected to the plug 13 receives VCC through the contact a, while
the microphone The output is supplied to the output of L through the contact piece B. (Due to the
release of B and E, H is not supplied. ) Plug the plug 13 into the jack 12 instead, and supply the
output of H through the junction iB to the output of L through the junction, jack 11 respectively,
while obtaining the supply of the VCO through the jack 11 . Therefore, even if the plug 13 is
inserted into any of the jacks 11.12, an output is output to the main sound.
Now, when an external input (mono) is connected to any of the jacks 11.12, the output is output
only to the output side corresponding to that input. Now, the plug 13 is X, the plug of the
microphone for external connection is Y and V, and the outputs X and Y of the relationship
between this and the jack 11.12 are as follows. When the contact pieces A and D are connected
in the jack 11 as shown in FIG. 4 on the other hand, as in FIG. 4, next, instead of the jack 120, a
jack corresponding to 2 in FIG. 1 is used. . According to the present invention, according to the
present invention, at least one of the signal system and the jack corresponding to the output side
is provided with a switch, and the jack for the internal microphone is of the stereotype and the
jack By short-circuiting the two contact pieces, the same purpose as the conventional one can be
achieved with two jacks. Although it is a condition with a switch, the diameter of the plug to be
used can be the same for internal and external use, and its handling becomes advantageous also
in use.
Brief description of the drawings
1 is an electrical connection diagram of a conventional microphone input circuit, FIG. 2 is a front
view of an internal microphone plug according to an embodiment of the present invention, FIG. 3
is a front view of the plug, and FIGS. It is an electrical schematic which shows the other Example
of this invention.
11.12 · · · · · · · · Jack with switch, · · · · · · · · · · Plug for stereo. Name of Agent Attorney Nakao
Toshio One other person Figure 1!
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jps6132696, description
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