Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
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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Lilja Patrik
Thomas Eric Anthony
Ericsson Inc.
Hall David C.
Matar Ahmad F.
Saint-Surin Jacques
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