Controlled simultaneous analog and digital communication

Details Controlled simultaneous analog and digital communication Controlled simultaneous analog and digital communication

1993-06-14

1996-07-16

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375222, 379 93, 370 20, H04L 512

Patent

active

055374417

ABSTRACT:
A method and apparatus for control of concurrent communication of analog information and digital information. In general terms, when the communication channel is viewed as a multi-dimensional space, the digital information signal is divided into symbols, and the symbols are mapped onto the signal space with a preset distance between them. The analog signal, generally limited in magnitude to less than half the distance separating the symbols, is converted to component signals and added (i.e., vector addition) to the symbols. The sum signal is then transmitted to the receiver where the symbols are detected and subtracted from the received signal to yield the analog signal components. The transmitted analog signal is recreated from those components. Both half-duplex and full-duplex operation is available in accordance with this invention. The illustrative embodiment includes a controller that is sensitive to input signals applied to the modem disclosed herein. To wit, the control is sensitive to signals from the analog port, signals from the digital port, and signals from the port that carries the combined digital and analog signals. Operation of the near-end modem is controlled as well as operation of the far-end modem.

REFERENCES:
patent: 4512013 (1985-04-01), Nash
patent: 4546212 (1985-10-01), Crowder, Sr.
patent: 4672602 (1987-06-01), Hargrave et al.
patent: 4757495 (1988-07-01), Decker et al.
patent: 4851806 (1990-01-01), Farias et al.
patent: 4924516 (1990-05-01), Bremer et al.
patent: 5081647 (1992-01-01), Bremer
patent: 5103227 (1992-04-01), Betts
patent: 5151972 (1992-09-01), Lorenz et al.
patent: 5243629 (1993-09-01), Wei
"Adaptive Equalization and Phase Tracking for Simultaneous Analog/Digital Data Transmission," The Bell System Technical Journal, vol. 60, No. 9, Nov. 1981, by T. L. Lim and M. S. Mueller, pp. 2039-2063.
"High Speed Digital and Analog Parallel Transmission Technique Over Single Telephone Channel", IEEE Transactions on Communications, vol. COM-30, No. 5, May 1982, by F. Akashi, Y. Sato and M. Eguchi, pp. 1213-1218.
"Simultaneous Transmission of Speech and Data Using Code-Breaking Techniques", The Bell System Technical Journal, vol. 60, No. 9, Nov. 1981, by R. Steele and D. Vitello, pp. 2081-2105.
"Adaptive Noise Cancelling: Principles and Applications", Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975, by B. Widrow et al, pp. 1692-1716.
"An Integrated Digital Subscribers Speech and Data Service", ICC Conf. Rec., vol. 3, Seattle, Washington, Jun. 8-12, 1980, by L. J. Stagg and D. Clothier, pp. 39.6.1-39.6.6.
"Frequency Domain Data Transmission using Reduced Computational Complexity algorithms", ICASSP 80 Proc., Denver, Colorado, vol. 1, Apr. 9-11, 1980, by A. Peled and A. Ruiz, pp. 964-967.
"Speech-band data modems", Electronics & Power, vol. 26, No. 9, by P. F. Adams, pp. 733-736.
"Speech and Data Transmission in ACS Telephone Channels", Telecommunication & Radio Eng., vol. 30/31, Jul. 1976, by V. E. Bukhviner, pp. 66-70.
"Method for superimposing Data on Amplitude-Modulated Signals", Electronics Letters, vol. 18, No. 9, Apr. 29, 1982, by Lockhart et al pp. 379-381.
"A New Generation of Speech Plus Data Multiplexer", Conference on Communications and Equipment and Systems, Birmingham, England, Apr. 4-7, 1978, by N. N. Y. Shum et al, pp. 111-113.

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