Handsfree radiotelephone having dynamic path attenuation control

Details Handsfree radiotelephone having dynamic path attenuation control Handsfree radiotelephone having dynamic path attenuation control

1996-12-13

1998-07-28

Matar, Ahmad F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379389, 379420, H04M 908

Patent

active

057871655

ABSTRACT:
A speakerphone having echo suppression is provided. The speakerphone has an audio control system comprising a transmit path, a receive path, a pair of rectifiers for producing rectified signals indicative of the strength of the signals present on the receive path and the transmit path, respectively, and an analog-to-digital converter for generating digital samples of the rectified signals for further processing. The audio control system further includes a general use microprocessor. Samples of the rectified signals are taken periodically and processed to determine if the receive path or the transmit path should have control, or if the audio system should be in an idle state. If speech is detected on either channel, the samples are weighted depending on the current state of the audio system. The weighted samples are then analyzed to determine which path should have control.

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