Method and apparatus for detecting speech at a near-end of a com

Details Method and apparatus for detecting speech at a near-end of a com Method and apparatus for detecting speech at a near-end of a com

1996-10-11

2000-10-31

Isen, Forester W.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379390, 379406, 379420, 381 66, 381 711, H04M 908

Patent

active

061414158

ABSTRACT:
A method and communication system (10), which can be used in a full, pseudo full, or half duplex speaker-phone system, includes a circuit (14) to remove a frequency component from a received signal to output a modified received signal, and a speaker (18) to convert the modified received signal to an acoustic signal (20). The circuit (14) may be, for example, a notch filter, which may remove a sharp frequency range between about 1250 Hz and 1550 Hz. A microphone (26) converts a second acoustic signal (24) to an electrical signal for transmitting, and a detector (30) produces a detector output if the removed frequency is present in the acoustic signal (24). A circuit (34) is also provided to modify a circuit parameter applied to the received signal when the detector (30) produces a detector output. The parameter may be, for instance an attenuation applied to the received signal.

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