Noise removing apparatus using a microphone

Details Noise removing apparatus using a microphone Noise removing apparatus using a microphone

1994-12-27

1998-04-14

Le, Huyen D.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Thermal response to, or generation of, sound vibration

321 92, 321168, H04R 2500

Patent

active

057402620

ABSTRACT:
An arrangement for noise removal according to the present invention includes a microphone and an acoustic high-pass filter positioned in front of the microphone and consisting of the combination of an acoustic resistance, an acoustic compliance and an inertance. According to the invention, the acoustic resistance is composed of nonwoven fabric; the acoustic compliance, of a cavity; and the inertance, of a thin cavity connected to said cavity. This acoustic high-pass filter reduces unpleasant noise which arises from the microphone when a low-frequency high-pressure air stream, such as the speaker's breath, hits the mouthpiece of the telephone.

REFERENCES:
patent: 2672932 (1954-02-01), Volkmann et al.
patent: 2718272 (1955-08-01), Olson et al.
patent: 3585317 (1971-06-01), Dvorsky
patent: 3947646 (1976-03-01), Saito
patent: 4637489 (1987-01-01), Iwanaka et al.
patent: 4677675 (1987-06-01), Killion et al.

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