Method for cancelling echo in a transmitter and an apparatus the

Details Method for cancelling echo in a transmitter and an apparatus the Method for cancelling echo in a transmitter and an apparatus the

1988-11-16

1990-01-23

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

048963186

ABSTRACT:
A method for cancelling an echo in a network termination (NT) of a transmission system and an apparatus therefor are disclosed. The method comprises the steps of detecting an end of transmission of a specific data train in an up-going signal when the phase of the received clock is to be shifted for synchronization during the transmission of the up-going signal from the NT, shifting the phase of the receiving clock when the end of transmission is detected, sampling a residual echo signal of the echo of the specific data train not cancelled by the adaptive filter, determining a correction value for the output of the adaptive filter and storing the correction value and adding a sign corresponding to the direction of the phase shift to the correction value after the phase shift and adding the result to the output of the adaptive filter to cancel the echo of the specific data train.

REFERENCES:
patent: 4682358 (1987-07-01), Werner
patent: 4695998 (1987-09-01), Schollmeier et al.
"Asynchronous and Timing Jitter Insensitive Data Echo Cancellation", D. Messerschmitt, IEEE Transactions on Communications, vol. COM-34, No. 12, 12-1986.
"An Echo Canceller LSI for ISDN Subscriber Loop Transmission", M Fukuda, IEEE International Conference on Comm. 1987, Seattle 7th, 10th Jun. 1987.
"Digital Subscriber Loop Transmission System for ISDN Based on Echo Cancellation Techniques", Koike et al, 298 NEC Research & Development, Jul. 1986, No. 82, pp. 83-95.
"Design Issues in the ISDN U-Interface Transceiver", D. Messerschmitt, IEEE Journal on Selected Areas in Communication SAC-4, No. 8, Nov. 1986, pp. 1281-1293.

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