Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1979-10-26
1981-02-17
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358163, H04N 9535
Patent
active
042518318
ABSTRACT:
A system for processing discrete digitized samples representing composite signals utilizing a filter which eliminates a periodic signal component from the composite signal. The filter receives and stores consecutive digital sample representations of the composite signal and, for each received sample representation, provides a digital average representation of the values of a selected number of the received digital sample representations which define a zero average value of the periodic signal component. In one embodiment of the signal processing system, the filter is arranged in circuit with digital delays and digital signal combining and differencing circuits to form a digital color television signal dropout compensator, which is adaptable for use in NTSC, PAL, PAL-M, or other television standard systems. In a dropout compensator adapted for NTSC color television signals, the filter receives the digital composite television signal and eliminates the chrominance component therefrom, leaving only the luminance component at its output. A following digital subtractor is coupled to subtract the luminance component provided by the filter from the received digital composite television signal and provide the chrominance component at its output. The separated chrominance component is phase adjusted on consecutive television lines and recombined with the separated luminance component provided by the filter for substitution in the television signal in place of the dropout affected portion thereof. The dropout compensator also includes a digital delay of one horizontal line period through which the television signal components are passed to provide the delay necessary for substituting television signal information from a prior horizontal line.
REFERENCES:
patent: 4143396 (1979-03-01), MacKenzie
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