Electronic cancellation of ambient noise in telephone receivers

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

H - Electricity

04

M

H04M 1/74 (2006.01) H04M 1/19 (2006.01) H04M 1/60 (2006.01)

Patent

CA 2107316

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 toenhance 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 thenoise cancellation without interrupting the incoming speech path altogether. (FIG. 1)

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