Communication system analog-to-digital converter using echo info

Details Communication system analog-to-digital converter using echo info Communication system analog-to-digital converter using echo info

1989-09-25

1991-03-12

Dwyer, James L.

Multiplex communications

Wide area network

Packet switching

379406, H04J 100

Patent

active

049998307

ABSTRACT:
A communication system for exchanging digital signals over a transmission link has at least one terminal that simultaneously applies an analog signal corresponding to a first digital stream to the link and converts an analog signal from the link into a second digital stream. The analog signal received from the link has a near end echo component related to the first digital stream. The second digital stream formation includes generating an m<n bit digital signal corresponding to the echo component of the received analog signal from the input digital stream, forming an analog signal representing the difference between the received analog signal and the predetermined component m bit digital signal, converting the difference representative analog signal to an n-m bit digital signal, and combining the m bit digital signal corresponding to the predetermined component with the n-m bit digital signal corresponding to the difference representative signal to produce an n bit digital signal representing the received analog signal.

REFERENCES:
patent: 4612533 (1986-09-01), Evans
patent: 4746902 (1988-05-01), Tol et al.
IEEE Transactions on Communications, vol. COM-30, No. 9, Sep. 1982, "Large Scale Integration of Hybrid-Method Digital Subscriber Loops", by Oscar Agazzi, David A. Hodges and David G. Messerschmitt, pp. 2095-2108.
Proceedings of the 1988 IEEE Custom Integrated Circuits Conference, Rochester, N.Y., May 1988, "A 13 Bit 160 KHz Sigma-Delta A/D Converter for ISDN", by S. R. Norsworthy and I. G. Post, pp. 21.3.1-21.3.4.
IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-22, No. 6, Dec. 1974, "A New Hardware Realization of Digital Filters", by A. Peled and B. Liu, pp. 456-462.

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