Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
Reexamination Certificate
2011-06-28
2011-06-28
Kuntz, Curtis (Department: 2614)
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With electrostatic microphone
C381S111000, C381S174000, C381S175000, C381S120000, C381S191000, C330S296000
Reexamination Certificate
active
07970154
ABSTRACT:
A condenser microphone is obtained, in which the bias of a current amplifier circuit in emitter-follower connection immediately after an impedance converter automatically changes in accordance with the switching of phantom power supply voltages and the maximum output level and the maximum permissible input sound pressure level are increased at any power supply voltage. The condenser microphone comprising a transistor Q2in emitter-follower connection immediately after an FET2that constitutes an impedance converter Q1has a constant current diode D2connected to an output transformer TRS that also serves as a transformer for phantom power source supply and resistors R0and R1that divide the voltage on the cathode side of the constant current diode D2into a bias voltage that causes the transistor Q2to operate.
REFERENCES:
patent: 5341086 (1994-08-01), Fukudome
patent: 2004/0196990 (2004-10-01), Akino et al.
patent: 2006/0198409 (2006-09-01), Chen
patent: 6-52300 (1994-07-01), None
patent: 9-83274 (1997-03-01), None
patent: 9-83463 (1997-03-01), None
patent: 2001-352596 (2001-12-01), None
Yoshio Kikuchi, Control circuit of Microphone power source, Jul. 15, 1994. Translation of JP 06-052300.
Joshi Sunita
Kabushiki Kaisha Audio-Technica
Kuntz Curtis
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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