Waveform correction by sampling

Details Waveform correction by sampling Waveform correction by sampling

1980-02-26

1981-08-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 74, 455 70, H04J 1500, H04B 176

Patent

active

042850584

ABSTRACT:
A system which automatically corrects the wave-form of a signal of a given frequency passing over a transmission path, over which a carrier double-sideband amplitude-modulated by a complex tone and extending across the given signal-frequency band is transmitted in the signal-frequency band as a combined wave with the signal. At the receiving apparatus the reconstructed modulated carrier is used as a standard to correct the waveform of the signal from distortion caused by the transmission path, using sampling, reconstruction, comparison and gain-variation methods. The modulated carrier is eliminated from the corrected signal at the output of the receiving apparatus by sampling and reconstruction methods. Sampling and modulation frequencies and phases are derived from the carrier.

REFERENCES:
patent: 2974224 (1961-03-01), Ule
patent: 3582788 (1971-06-01), Castagna
patent: 3974447 (1976-08-01), Lofmark
patent: 4009350 (1977-02-01), Cabet et al.
patent: 4034296 (1977-07-01), Berenson et al.
Transmission Systems for Communications, Bell Telephone Laboratories, 1971, pp. 654 & 655.
Reference Data for Radio Engineers, Howard W. Sams, 1969, pp. 15-1 to 15-13.

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