System for bidirectional digital transmission with echo cancella

Telephonic communications – Subscriber line or transmission line interface – Network interface device

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379406, 370 321, H04B 323

Patent

active

046867031

ABSTRACT:
A bidirectional transmission system with echo cancellation allows simultaneous interchange of digital information between an exchange and subscribers on a single transmission line. Data flows are transmitted by packets separated by short silence intervals within which clock signals are extracted and echo-cancellation adjustment is accomplished. Use of an adaptive equalizer and a single sampling operation per sampling period are possible.

REFERENCES:
patent: 3588385 (1971-06-01), Moye
patent: 4131767 (1978-12-01), Weinstein
patent: 4394767 (1983-07-01), Shum
patent: 4539674 (1985-09-01), Carlquist et al.
patent: 4539675 (1985-09-01), Fisher
"A New Approach for a Microprogrammed Echo Canceller", M. Copperi et al., Conference: Fifth International Conference on Digital Satellite Communications, Genoa, Italy, Mar. 23 through 26, 1981, pp. 259-264.
"Digital Echo Cancellation for Baseband Data Transmission", N. Verhoeckx et al., IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP 27, No. 6, Dec. 1979, pp. 768-782.
"Combining Echo Cancellation and Decision Feedback Equalization", K. Mueller, Bell System Technical Journal, vol. 58, No. 2, Feb. 1979, pp. 491-500.
"Echo Cancellation Techniques for Full-Duplex Data Transmission on Two-Wire Lines", D. D. Falconer et al. Bell Telephone Laboratories, pp. 83-1-7.

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