Outbound noise cancellation for telephonic handset

Details Outbound noise cancellation for telephonic handset Outbound noise cancellation for telephonic handset

1993-09-02

1995-04-11

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379416, 379392, 379411, 381 71, 381 94, 381 47, H04B 1500, H04M 100

Patent

active

054066220

ABSTRACT:
A telephone handset outbound noise canceller uses an omnidirectional reference microphone placed near the transmitter grille. Two adaptive filters are employed, one driven by the handset transmitter to subtract speech from a reference value to produce an enhanced reference signal; and a second adaptive filter driven by the enhanced reference signal to subtract noise from the transmitter. The weights of the two adaptive filters are allowed to adapt or are frozen according to criteria set as a result of transmitter power measurements which determine whether speech is likely to be present or not.

REFERENCES:
patent: 5033082 (1991-07-01), Eriksson et al.
patent: 5131047 (1992-07-01), Hashimoto et al.
patent: 5251263 (1993-10-01), Andrea et al.

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