Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1996-05-24
1999-04-20
Le, N.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379416, 379406, 379398, H04M 100
Patent
active
058964525
ABSTRACT:
A two-wire line and a four-wire line telephone system interface with each other through a hybrid (12). After a connection between the two and four-wire line systems is made, an echo canceler (10) provides training signals to the hybrid on the transmit path an generates echo cancellation signals on the receive path. An adaptive filter (16) is employed to provide the proper echo cancellation signals, while a controller (22) provides filter coefficients based on an error signal. The training signals include the convolution of an impulse function with a sin(x)/x function. Once the filter coefficients are determined for the particular call, the transmit path of the four-wire line system is switched in and voice data between the two systems my commence.
REFERENCES:
patent: 4760596 (1988-07-01), Agrawal et al.
patent: 4887257 (1989-12-01), Belloc et al.
patent: 5050160 (1991-09-01), Fuda
patent: 5164989 (1992-11-01), Brandman et al.
patent: 5467394 (1995-11-01), Walker et al.
IEEE Standard Dictionary of Electrical and Electronics Terms, 6th Edition, IEEE Std. 100-1996.
Callaghan Thomas Gerard
Nall Thomas
Yip William Chunhung
Gorrie Gregory J.
Hsieh Shih-Wen
Le N.
Motorola Inc.
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