JPS5672597

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DESCRIPTION JPS5672597
Description 1, title of the invention
Microphone device
3. Detailed Description of the Invention In the present invention, a microphone main body
incorporating two sets of microphone units and a drive power supply of the microphone main
body are connected by a single two-core shield gouple, and each core of the shield cable Microbon apparatus adapted to exchange power and output signals via Conventionally, a capacitor
type microphone device by an external power supply system generally requires a power supply
line for driving a micro-bon 1 and a signal transmission line for microphone output signal
transmission, and at least a two-core shielded cable Connection between the microphone device
and an external device provided with a driving power supply or the like of the microphone
device. A microphone device in which a single-phase directional microphone unit and a bidirectional microphone unit are coaxially orthogonal to each other and is incorporated into one
microphone body is conventionally used. The directivity of this so-called M-8 type microphone
device is variable leftward or rightward by combining the output of the unidirectional
microphone unit and the output of the bidirectional microbon unit by sum or by difference. Be
done. Such a microphone device can freely change the directivity, and therefore, when
performing stereo recording or the like, it is extremely effective for freely controlling the spread
of the left and right directivity ranges and obtaining a sense of presence. However, when using
this type of microphone device, since two sets of microphone units are incorporated in one
microphone body, EndPage: 1 can be obtained by the conventional method if the abovementioned microphone body, drive power source, control unit, etc. It is necessary to use two 2core shielded cables or to use 1000 or more shielded cables in order to connect with an external
device to be barked. It is extremely inconvenient to handle connecting two 2-core shielded cables
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to one microphone body in this way. In addition, since a multi-core shielded cable of four or more
cores is not generally used for versatility, it is extremely inconvenient because it needs to be
specially prepared for this type of microphone device. In particular, a 2-core shielded cable is
exclusively used in existing music halls and studios, so when using the above-mentioned
microphone device in such a place, a dedicated 4-core or more multi-core shield is used. It is
necessary to lay a cable. Therefore, the present invention solves the above-mentioned handling
inconvenience, and uses two single-core shielded cables, which are generally used without using
a multi-core shielded cable of four or more cores. It is made to connect between the 1
microphone main body which incorporated the unit, and the external device provided with the
drive power supply etc. of this microphone main body.
The invention will now be described with reference to the examples shown in the drawings. In
this embodiment, a microphone body 1 in which two sets of micro-bon units of a single-phase
directional first micro-bon unit 2 and a bi-directional second micro-bon unit 3 are coaxially
orthogonally incorporated have. Each of these micro-bon units 2 ° 3 is connected to the
connection terminals 6 and 7 via an impedance converter 4 ° 5 so that each output signal is
output at a low output impedance. The output terminals of each of the impedance converters 4
and 5 are connected to the connection terminals 6 and 7 via the DC blocking capacitors 8 and 9,
and the driving power supply terminals 10.11 have a resistance 12.13. Connected through.
Further, one end of each of the core wires 15 and 16 of the two-core shield cable 14 is connected
to each of the connection terminals 6 and 7. The other end of each core wire 15.degree. 16 to
which one end of each connection terminal 6.7VC of the microbon main body 1 is connected in
this manner is the connection terminal 19 of the external device 18 including the microphone 1
drive power supply 11 for driving the microphone main body 1. Connected to .20. The resistors
21 and 22 are connected in series between the connection terminals 19. 20 connected to the
other ends of the core wires 15 and 16, respectively, and the neutral point 23 of the resistors 21
and 22 and the two-core shielded cable 6 The microphone drive power supply 17 is connected
between the shield wire 24 and the microphone. Further, a capacitor 27 ° 28 for blocking the
direct current is provided between each output terminal 25. 26 of the external device 18
including the microphone drive power supply 17 and each resistance 21. 22. In the present
embodiment, the output terminal 25 is A matrix circuit 29 is connected which combines the
outputs of the first and second microphone units 2 and 3 with each other or sums the difference
via a difference 26 via. First, the DC power supplied to the neutral point 23 of each resistor 21 °
22 of the external device 18 will be described with reference to the outline of the operation of
the embodiment configured as described above. The microphone main body 1 is supplied via the
core wires 15 and 16. The microphone main body 1 (the supplied DC power is supplied only to
the drive power terminals io and i1 by the action of the DC blocking condensers 8 and 9
provided in the microphone main body 1. Further, the AC output signals of the first and second
microphone units 2 and 3 are applied to the respective impedance converters 4.5 and output
through the capacitors 8 and 9 respectively at low output impedance. .
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The respective output signals outputted at low output impedance are respectively applied to the
external device 18 through the multi-core 1115.16 of the two-core shielded cable 14. From the
output terminals 25 and 26 of the external device 18, only the above-mentioned AC output signal
is taken out by the action of the DC cutting capacitor 27. 28 provided on the device 18.
According to the present invention as described above, between the microbon main body 1
incorporating two sets of microphone units and the drive power supply etc. of the microphone
main body (6) EndPage: 2 a conventional external device There is no need to use a plurality of 4core or more multi-core shielded cables or 2-core shielded cables as in the method, and
connection can be made with widely used two-core shielded cables. Therefore, the handling of
the microphone incorporating a plurality of microphone units becomes extremely easy, and it
becomes possible to use the microphone in an almost same manner as the microphone
incorporating only one microphone unit in an existing music hall or studio. . By the way, in the
above-mentioned embodiment, although a so-called M-8 type microphone device has been
described as an example, the present invention can be applied to a device having a microphone
main body incorporating two sets of microphone units each having independent directivity
characteristics. In addition, the directivity characteristics can be varied independently of one
another. The present invention can be similarly applied to a microphone device in which two sets
of microphone units are incorporated and the output signals from these microphone units are
appropriately mixed by a mixing circuit to obtain desired directivity characteristics. Furthermore,
it is equally applicable to a microphone device in which a microphone unit performing a
complementary action of one microphone unit is incorporated and the other is operated when
the one becomes unusable.
4. Brief Description of the Drawings FIG. 1 is a circuit diagram showing an embodiment of the
present invention. DESCRIPTION OF SYMBOLS 1 ... Microphone main body 2 ... 1st microphone
unit 3 ... 2nd microphone unit 4.5 ... impedance converter 14 ... 2 core shield cable 15.16 ... core
wire 17 ... · · Microphone drive power supply 24 · · · Shield wire patent applicant Sony
Corporation Attorney Attorney Koike Satoshi EndPage: 3
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