Digital echo canceller

Details Digital echo canceller Digital echo canceller

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01) H04L 25/08 (2006.01)

Patent

CA 1181148

ABSTRACT: "Digital echo canceller". An echo canceller is used to cancel an echo signal occurring in the receive path of a data trans- mission modem in response to the signal appearing in the transmit path. This echo canceller comprises a controlla- ble digital filter connected to the transmit path and adjusted by means of a control circuit, a difference circuit producing a residual signal resulting from the difference between the signal in the receive path and the synthetic echo signal supplied by the filter and an analog- to-digital converter which converts the residual signal into a digital control signal for the control circuit. In order to have the echo canceller function in a homo- chronous transmission system with an analog-to-dlgital converter having a reduced number of bits, said converter has a controllable dynamic which is adjusted by the output signal of an attenuation circuit connected to the output of a circuit which detects the peak value of the residual signal t

385879

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