Adaptive balancing network

Details Adaptive balancing network Adaptive balancing network

1991-03-25

1992-10-06

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

379410, 379406, 379390, H04M 908

Patent

active

051538750

ABSTRACT:
An adaptive balancing network apparatus provides improved cancellation of transhybrid response. The adaptive balancing network removes near-end echo much better than the prior art methods over a wide variation of the loop plant, and hence, provides a cost-effective implementation of a transceiver. The apparatus comprises two adaptive balancing networks and a balancing network filter that provides increased echo cancellation in the analog domain of up to 25 dB, so that the signal can be amplified before the A/D and D/A conversion by about 20 dB more than it could be by a simple divider balancing network. Therefore, the requirements for A/D and D/A convertors can be relaxed from 13 bits to 10 bits (or less). The first adaptive balancing network removes a first portion of the echo using a transmitted signal. The balancing network filter reshapes the transmitted signal and shifts it in time so that the second adaptive balancing network can cancel a second portion of the echo. Control of the adaptive balancing networks is accomplished by monitoring the coefficients of an echo canceller in the digital domain during an initial convergence time period; thereafter the balancing networks are frozen until their next initialization.

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