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DESCRIPTION JP2006237921

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DESCRIPTION JP2006237921
PROBLEM TO BE SOLVED: To reduce (suppress) offensive noise by reducing an audio output
when an electromagnetic wave is detected. SOLUTION: In a condenser microphone used by
connecting a condenser microphone unit to an external device such as a power supply circuit or
a mixer circuit via an audio output circuit and a microphone cable, light emission is generated by
high frequency detection means 110 and its high frequency detection output. Light emitted from
the light emitting means 120 is connected in parallel between the hot side line H and the cold
side line C of the receiving antenna 100 having the means 120 and the audio signal output line
200 from the audio output circuit to the external device And a photoconductive element 210
whose resistance value decreases. [Selected figure] Figure 1
コンデンサマイクロホン
[0001]
The present invention relates to a condenser microphone, and more particularly, to a technique
for reducing noise generated due to extraneous electromagnetic waves.
[0002]
As shown in FIG. 2, generally, the condenser microphone 10 is used by being connected to an
external device 30 such as a phantom power supply or a mixer circuit via a microphone cable 20
consisting of a balanced shield cable.
[0003]
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The condenser microphone 10 in this example includes a cylindrical microphone housing 11
made of, for example, a brass alloy that functions as a shield, and one end side of the microphone
housing 11 is covered with a protective cover 13 made of a metal mesh. It is supported in
Although not shown, the condenser microphone unit 12 incorporates an FET (field effect
transistor) as an impedance converter.
[0004]
The microphone housing 11 incorporates a circuit board 14 including an audio output circuit.
When the microphone cable 20 is detachable, male connectors 21 and 21 are provided at both
ends of the microphone cable 20, and female connectors 15 and 31 are provided at the other
end of the microphone housing 11 and the external device 30 side. Provided.
[0005]
These connectors are 3-pin type connectors defined by JEITA (The Electronic Machinery
Industries Association of Japan) RC-5236 "Latch Lock Round Connector for Audio Equipment",
and although not shown, they are each for grounding. The first pin, the second pin on the hot
side of the signal, and the third pin on the cold side of the signal are provided.
[0006]
The first pin of each of the male connectors 21 and 21 is connected to the shielded cable of the
microphone cable 20.
The first pin of the female connector 15 on the microphone 10 side is connected to the
microphone housing 11, and the first pin of the female connector 31 on the external device 30
side is connected to the ground of the external device 30.
[0007]
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Therefore, when the condenser microphone 10 is connected to the external device 30 via the
microphone cable 20, the microphone housing 11 functions as a shield together with the shield
covering wire of the microphone cable 20.
[0008]
However, when a strong electromagnetic wave is applied to the microphone case 11 or the
microphone cable 20, a high frequency current by the electromagnetic wave enters the inside of
the microphone case 11 through the connectors 15 and 21, and the FET or circuit board 14 in
the condenser microphone unit 12 It may be detected by the semiconductor element of the audio
output circuit implemented in the above, and may be output from the microphone as audio
frequency noise.
[0009]
In recent years, mobile phones have spread rapidly, but since radio waves of high frequency
(several GHz) are emitted at the time of transmission from mobile phones, and the radiation
electric field strength is large, as shown in FIG. When the mobile phone 40 is used, noise is likely
to be generated by the strong electromagnetic wave.
[0010]
As one of the methods to prevent this, there is known a method of reducing the impedance of the
connection portion by interposing a conductive member such as a leaf spring in the connection
portion of the connector, but since mechanical contact is used, There are limits to reducing the
impedance, and it may not always be effective.
[0011]
Therefore, an object of the present invention is to provide a condenser microphone in which
offensive noise is reduced (suppressed) by reducing an audio output when an electromagnetic
wave is detected.
[0012]
In order to solve the above-mentioned problems, the present invention relates to a high
frequency detection means and a capacitor microphone which is used by connecting a condenser
microphone unit to an external device such as a power supply circuit or a mixer circuit via an
audio output circuit and a microphone cable. It is connected in parallel between the hot side and
the cold side of the audio signal output line from the audio output circuit to the external device,
and is emitted from the light emitting means. And a photoconductive element whose resistance
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value is lowered.
[0013]
In the present invention, the receiving antenna is preferably a loop coil formed by connecting the
high frequency detecting means and the light emitting means in series.
Preferably, the high frequency detection means is a Schottky diode, and a light emitting diode for
emitting visible light is preferably adopted as the light emitting means.
[0014]
Further, a CdS (cadmium sulfide) element or a phototransistor can be used as the
photoconductive element.
The photoconductive element may be connected in parallel between the output terminals of the
audio output circuit, but in order to be applicable to existing microphones, the photoconductive
element may be connected in parallel between the hot side and the cold side of the microphone
cable. Preferably connected to
[0015]
According to the present invention, when the electromagnetic wave is detected by the receiving
antenna, the light emitting means emits light, and the light decreases the resistance value of the
photoconductive element, thereby shorting the hot side and the cold side of the audio signal
output line ( Since the state becomes conductive, even if noise due to electromagnetic waves is
generated, the noise is also narrowed as the sound output decreases.
Therefore, the unpleasant feeling due to the offensive noise can be eliminated.
[0016]
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Next, an embodiment of the present invention will be described with reference to FIG. 1, but the
present invention is not limited thereto.
FIG. 1 is a schematic view showing the main part of the present invention, but for the entire
configuration of a condenser microphone and a microphone cable etc., refer to FIG. 2 described
above as an example.
[0017]
The condenser microphone of the present invention includes a receiving antenna 100 for
receiving an electromagnetic wave, and a photoconductive element 210 connected in parallel
between the hot side line H and the cold side line C of the audio signal output line 200. .
[0018]
The receiving antenna 100 is preferably a loop coil having the simplest configuration, and the
high-frequency detection means 110 and the light emitting means 120 emitting light by the
detection output are included in series in this loop coil.
[0019]
In this example, a Schottky diode (Schottky Diode) 111 excellent in high frequency detection
capability is used for the high frequency detection means 110, and a light emitting diode 121 is
used for the light emission means 120.
[0020]
The photoconductive element 210 is a visible light conductive element that receives the light of
the light emitting diode 121 and whose resistance value is reduced by the intensity of the light,
and for example, a CdS (cadmium sulfide) element or a photodiode can be used.
[0021]
The connection point of the photoconductive element 210 to the audio signal output line 200
may be arbitrarily selected as long as it is from the condenser microphone unit 12 shown in FIG.
2 to the external device 30, for example, mounted on the circuit board 14 Although it may be
between the output terminals of the audio output circuit (not shown) (between the second and
third pins of the output connector 15), considering application to an existing microphone, the hot
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side line H of the microphone cable 20 Preferably, it is between the cold side line C and the cold
side line C.
[0022]
The receiving antenna 100 may be attached to a predetermined location of the microphone
housing 11, for example, by a suitable attachment such as a belt or a planar fastener.
As described above, when the receiving antenna 100 is attached to the microphone housing 11,
the photoconductive element 210 is disposed so as to draw the wiring and optically couple in the
vicinity of the light emitting diode 121.
The photoconductive element 210 and the light emitting diode 121 can also be coupled using an
optical fiber.
[0023]
According to the present invention, for example, when a strong electromagnetic wave is applied
to the receiving antenna 100 from a portable telephone, the electromagnetic wave is detected by
the high frequency detecting means 110 (in this example, the Schottky diode 111), and the light
emitting means 120 (this In the example, the light emitting diode 121) emits light.
[0024]
When this light is received by the photoconductive element 210, the resistance value of the
photoconductive element 210 decreases in proportion to the amount of light received.
As a result, the hot side line H and the cold side line C of the audio signal output line 200 are
electrically connected, and one type of mute is applied to reduce the audio output.
Therefore, even if noise due to electromagnetic waves is generated, the noise is narrowed as the
voice output becomes smaller, so that the unpleasant feeling due to the offensive noise can be
eliminated.
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[0025]
The schematic diagram which shows the principal part of this invention.
The schematic diagram which shows the general use condition of a condenser microphone.
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 10 Condenser microphone 11 Microphone housing 12 Condenser
microphone unit 14 Circuit board 15 Output connector 20 Microphone cable 30 External
equipment 40 Mobile telephone 100 Reception antenna 110 High frequency detection means
111 Schottky diode 120 Light emission means 121 Light emitting diode 200 Audio signal output
line 210 Light Conducting element H Hot side line C Cold side line
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