Automatic equalization for a simulcast communication system

Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission

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179 2EB, 375 13, 455 35, 455 56, 455 67, H04B 350, H04B 162, H04B 304, H04B 1702

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active

045162697

ABSTRACT:
A simulcast communication system for permitting the same audio signal to be simultaneously broadcasted from a plurality of base stations located remotely from a dispatch station used to transmit this audio signal to each of the base stations over conventional telephone lines is described. The simulcast communication system generally comprises first circuit means for equalizing the audio signal transmission characteristics from the dispatch station to each of the base stations in response to at least one test signal broadcasted from each of the base stations, and second circuit means for generating a synchronized squelch signal at each of the base stations in response to a pilot signal transmitted to each of the base stations with the audio signal and a phasing signal transmitted to each of the base stations at the beginning of the audio signal.

REFERENCES:
patent: 1711560 (1929-05-01), Espenschied et al.
patent: 2033271 (1936-03-01), Aiken
patent: 2094113 (1937-09-01), Affel
patent: 4047009 (1977-09-01), Challen
patent: 4223405 (1980-09-01), Hattori et al.
patent: 4255814 (1981-03-01), Osborn
patent: 4301539 (1981-11-01), Kage
Jerome V. Krinock, "Automatic Equalization for Simulcasting", May 23, 1982.
G. D. Gray, "The Simulcasting Technique: An Approach to Total-Area Radio Coverage," TEEE Tr. Veh. Tech., vol. 28, p. 117, May 1979.
S. Thro, "System Configurations for Wide Area Trunking," Mobile Times, p. 22, Jul. 1981.
M. Henze, J. D. Parsons, P. A. Ratliff, M. J. Withers, "Diversity Techniques for Mobile Radio Reception," IEEE Tr. Veh. Tech., vol. 24, p. 75, 8-76.
D. S. Dewire, "Prec. Carrier Freq. Cont. & Mod. Phase Equal. of Base Trans. in a Mobile Radio System.," IRE Tr. Veh. Comm., vol. 9, p. 54, May 1960.
R. E. Langseth, "Some Effects of Delay and Mod.-Index Mismatch on Cochannel FM Interference," IEEE Tr. Veh. Tech., vol. 20, p. 124, Nov. 1971.
A. V. Oppenheim, R. W. Schafer, Digital Signal Processing, Prentice-Hall, Englewood Cliffs, N.J., 1975.
R. B. Blake, et al., "Voice-Frequency Transmission for Special-Service Telephone Circuits," Bell Sys. Tech. J., vol. 60, p. 1585, Sep. 1981.
American Microsystems, Inc., "S2811 Signal Processing Peripheral Advanced Product Description," Santa Clara, CA, Sep. 1981.
R. W. Lucky, H. R. Rudin, "Generalized Automatic Equalization for Communication Channels," Proc. IEEE, vol. 54, p. 439, Mar. 1966.
B. Widrow, et al., "Stationary and Nonstationary Learning Characteristics of the LMS Adaptive Filter," Proc. IEEE, vol. 63, p. 1151, 4/1975, Sec. II-IV.
M. Destino, J. McCool, B. Widrow, "Adaptive Filtering in the Frequency Domain," Proc. IEEE, vol. 66, p. 1658, Dec. 1978.
E. R. Ferrara, "Fast Implementation of LMS Adaptive Filtering," IEEE Tr. Acous., Speech Sig. Proc., vol. 28, p. 474, Aug. 1980.
S. C. Tanaka, R. R. Buss, G. P. Weckler, "The Tapped Analog Delay," IEEE Tr. Parts, Hybrids Packag., vol. 12, Jun. 1976.
A. P. Clark, Advanced Data Transmission Systems, J. Wiley, N.Y., 1977, pp. 46-73.
C. M. Rader, "FOUREA-A Short Demonstration of the FF1," in Programs for Digital Signal Processing, IEEE Press, New York, 1979.
H. L. Van Trees, Detection, Estimation and Modulation Theory, J. Wiley, New York, 1968, Eq. (146), p. 59.
D. T. L. Lee, et al., "Recursive Least Squares Ladder Estimation Algorithms", IEEE Tr. Acous., Speech Sign. Proc., vol. 29, p. 627, Jun. 1981.
M. S. Corrington, "Frequency Modulation Distortion Caused by Common-and Adjacent-Channel Interference, " RCA Rev., vol. 7, p. 522, Dec. 1946.
A. Wouk, A Course of Applied Functional Analysis, J. Wiley, New York, 1979, p. 238.

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