Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent
1997-10-15
1999-08-17
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
381123, H04R 300
Patent
active
059405201
ABSTRACT:
The present invention discloses a power circuit for a condenser microphone capable of automatically switching both internal power source and external power source without carrying out the switching operation of a switch. A positive side output line comprises a power switch for turning off the positive side output line to selectively connecting it to a ground side output line; a first diode connected with an input direction from the external power source being a forward direction between the power switch and an output terminal of the positive side output line; and a capacitor connected parallel with said power switch and said first diode so as to bypass them, a series circuit comprising the internal power source, a second diode and a load resistor with a direction from the ground side output line to the positive side output line being a forward direction being connected between a connection point of the power switch and the first diode and the ground side output line.
REFERENCES:
patent: 5239579 (1993-08-01), Schuh
patent: 5377273 (1994-12-01), Sutton
Harvey Minsun Oh
Kabushiki Kaisha Audio-Technica
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