Condenser microphone

Details Condenser microphone Condenser microphone

1982-05-13

1985-01-01

Rubinson, Gene Z.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179111R, 179131, 330269, 330273, 363133, H04R 1901, H04R 1900, H03F 326

Patent

active

044916973

ABSTRACT:
A condenser microphone including an electrostatic transducer provided with at least one conductive vibrating plate and at least one fixed electrode arranged opposite the vibrating plate, and through which output voltages can be obtained in response to an acoustic input, and an impedance converter circuit connected to output terminals of electrostatic transducer, wherein said electrostatic transducer is arranged in such a way that two output voltages out of phase with respect to each other are obtained through its first and second output terminals, and said impedance converter circuit includes first and second field effect transistors of same conductivity channel type whose gates are connected to output terminals of electrostatic transducer, respectively, and whose drains are connected to a DC power supply, first and second impedance elements connected between gates of field effect transistors and ground to hold the DC potential of each gate at ground level, and an output circuit means for generating an output signal corresponding to the difference between source potentials of field effect transistors.

REFERENCES:
patent: 3896274 (1975-07-01), Fraim et al.
patent: 4246448 (1981-01-01), Tam et al.
patent: 4298925 (1981-11-01), Melling
"Low-Power Inverter Ignites Gas Discharge Lamps", by Akavia Kaniel, Electronics, Jan. 13, 1981, p. 154.
Funkschau, vol. 51, No. 5, (Mar. 1979), "Ein Miniatur-Kondensator-Stereomikrof on", pp. 241-244.
National Technical Report, vol. 26, No. 6, Dec., 1980, "Push-Pull Type Condenser Microphone for Musical Instruments, by Michio Matsumoto et al., pp. 1060-1069.
Journal of the Audio Engineering Society, vol. 23, No. 7, Sep. 1975, "A Complementary Source Follower Circuit for Condenser Microphone Preamplifier", by: T. Ken Matsudaira et al., pp. 530-535.

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