Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1985-03-21
1987-08-11
Rubinson, Gene Z.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
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.
Bruno Carlo M.
Panarotto Gianfranco
Tofanelli Adler
Cselt-Centro Stude e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Ross Karl F.
Rubinson Gene Z.
Vaas R.
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