Digital signal receiver

Details Digital signal receiver Digital signal receiver

1984-08-13

1985-12-24

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358337, 375118, H03D 104

Patent

active

045611009

ABSTRACT:
A digital signal receiver is structured to receive and demodulate a digital signal. Such digital signal may comprise, for example, a television signal of character multiplex transmission having a digital signal included in the vertical blanking period of the television signal and a digital signal receiver may be structured to reproduce the digital signal from the television signal. The digital signal includes a clock run-in signal (CRI), a framing code signal (FRC) and a bit serial data signal (DA) disposed in succession. An error of the framing code or the data signal caused by a low frequency region group delay characteristic of a transmission path between the transmission and the demodulation is detected based on the digital signal. Upon detection of an error, a waveform distortion of the framing code signal and the data signal is corrected by means of a correcting circuit (15) such as an LC circuit, whereby an error of the data signal to be demodulated thereafter is prevented.

REFERENCES:
patent: 3660761 (1972-05-01), Harmon, Jr. et al.
patent: 3705315 (1972-12-01), Clark
patent: 3715665 (1973-02-01), Chang
patent: 3746800 (1973-07-01), Stuart
patent: 3935535 (1976-01-01), Motley et al.
patent: 4097806 (1978-06-01), Evans
patent: 4263672 (1981-04-01), Deman
patent: 4271520 (1981-06-01), Coombes et al.
patent: 4365329 (1982-12-01), Sauvanet
patent: 4430743 (1984-02-01), Watanabe
William D. Stanley, Electronic Communications Systems, Reston Publishing Company, Inc., 1982, pp. 100-105.

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