Electronic cancellation of ambient noise in telephone headset

Details Electronic cancellation of ambient noise in telephone headset Electronic cancellation of ambient noise in telephone headset

1996-10-28

1998-06-30

Isen, Forester W.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

351 93, 351 716, 351 7114, 351 942, H04R 2700

Patent

active

057745650

ABSTRACT:
Noise reducing circuits for electronic receiving instruments, such as telephone receivers in headsets or handsets that are used in noisy locations, provide compensation of the set's receiver unit-to-error microphone transfer function to enhance the noise reduction. Further circuits provide pre-conditioning of the incoming voice signal to make the noise cancellation more effective. The tendency of these noise cancelling circuits to oscillate is substantially lessened by added circuitry which rapidly detects onset of oscillation and momentarily reduces the noise cancellation without interrupting the incoming speech path altogether.

REFERENCES:
patent: 4455675 (1984-06-01), Bose et al.
patent: 4953217 (1990-08-01), Twiney et al.
patent: 4985925 (1991-01-01), Langberg et al.
patent: 5003606 (1991-03-01), Bordewijk
patent: 5276740 (1994-01-01), Inanaga et al.

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