Synchronized demodulation system

Details Synchronized demodulation system Synchronized demodulation system

1973-12-27

1976-06-01

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

325331, 178 73S, 329 50, H04N 316, H03D 318, H04B 168

Patent

active

039611353

ABSTRACT:
A demodulation system for use in a vestigial sideband system of an over-modulation type including a sampler for sampling a reduced carrier frequency component from a received modulated wave to be used for demodulation. A discriminator is operative to detect a vertical synchronizing signal portion in a vertical blanking period and thereupon to actuate the sampler, causing a carrier burst signal to build up. The carrier burst signal is subjected to filtering to derive a carrier wave which is supplied to a demodulator. A synchronizing pulse separator is connected to the demodulator to separate horizontal synchronizing pulses from a demodulated output, which pulses are fed back to the sampler to actuate it during the absence of the vertical synchronizing signal.

REFERENCES:
patent: 2778933 (1957-01-01), Crist
patent: 2938071 (1960-05-01), Pritchard
patent: 3023271 (1962-02-01), Hansen
patent: 3144512 (1964-08-01), McAllan et al.
patent: 3283079 (1966-11-01), Dixon
patent: 3492580 (1970-01-01), Berman
patent: 3502979 (1970-03-01), Holly
patent: 3674929 (1972-07-01), Aliyama
patent: 3697685 (1972-10-01), Lunn

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