Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent
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.
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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.
Sisido Michitaka
Yoshida Toshio
Le Huyen D.
NEC Corporation
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