System consisting of a microphone and a preamplifier

Details System consisting of a microphone and a preamplifier System consisting of a microphone and a preamplifier

2005-07-05

2005-07-05

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S174000, C381S191000, C381S322000

Reexamination Certificate

active

06914992

ABSTRACT:
A system, more particularly a hearing aid, consisting of a microphone and a preamplifier, wherein the microphone comprises a housing having therein an opening to the surroundings, a diaphragm and a backplate, while the amplifier is coupled to the system consisting of the diaphragm and the backplate and has a field effect transistor as input element. In the housing, in a space which is bounded by, on the one hand, the diaphragm and, on the other, the housing wall, and which does not comprise the opening to the surroundings, a pressure equalization opening is present, which has a diameter such that in the audible audiospectrum it does not make an essential contribution to the suppression of low frequencies. In the input stage of the amplifier, at the output of the field effect transistor, a low-pass filter or a high-pass filter or a combination thereof is arranged. Through this measure, the frequency characteristic can be optimally influenced to suppress noise.

REFERENCES:
patent: 3197048 (1965-07-01), Kohler
patent: 4056697 (1977-11-01), Heil
patent: 4063050 (1977-12-01), Carlson et al.
patent: 4331840 (1982-05-01), Murphy et al.
patent: 4450930 (1984-05-01), Killion
patent: 4701640 (1987-10-01), Flygstad et al.
patent: 4764690 (1988-08-01), Murphy et al.
patent: 5083312 (1992-01-01), Newton et al.
patent: 5452268 (1995-09-01), Bernstein
patent: 5812679 (1998-09-01), Killion et al.
patent: 5889872 (1999-03-01), Sooriakumar et al.
patent: 6031922 (2000-02-01), Tibbetts
patent: 6084972 (2000-07-01), van Halteren et al.
patent: 6154547 (2000-11-01), Whitecar
patent: 6243474 (2001-06-01), Tai et al.
patent: 6466678 (2002-10-01), Killion et al.
patent: 6504937 (2003-01-01), Papadopoulos et al.
patent: 0 533 284 (1993-03-01), None
patent: 0 800 331 (1997-10-01), None

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