Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-12-18
1981-12-15
Britton, Howard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 21R, 358138, 358160, H04N 712
Patent
active
043062490
ABSTRACT:
Encoded digital television signals having a defined bandwidth are transmitted at reduced bandwidth by regularly omitting (18) one in every n of the signal samples, where n is greater than two and is preferably three or four. At a receiver the omitted samples are regenerated by estimating (26) their values from the samples of the reduced-rate transmitted signal by making use of frequency components outside the normal defined bandwidth of the original signal. The estimation can be achieved by a symmetrical digital transversal filter of which one in every n coefficients is zero, the amplitude/frequency characteristics of the filter being unity throughout the defined bandwidth of the TV signal and antisymmetric about half the mean lower sample rate.
REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 3571494 (1971-03-01), Law
Clark, C. K. P., "Digital Television: The Use of Waveform Estimates in Error Correction", BBC Research Department Report, BBC RD 1977/27, Aug., 1977.
British Broadcasting Corporation
Britton Howard
O'Connell Robert F.
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