Vertical pre-filter for pip television receivers

Details Vertical pre-filter for pip television receivers Vertical pre-filter for pip television receivers

1986-06-05

1988-08-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358140, 358 22, H04N 514

Patent

active

047680938

ABSTRACT:
A vertical filter for filtering digital television signals in which the length of the filter may be greater than the decimation factor. The vertical filter includes a first and a second multiplier-accumulator section each having a multiplier for receiving each line in the digital television signal and for multiplying each line by a respective filter coefficient, a switch having a first input connected to an output of the multiplier, a line delay circuit connected to an output of the switch, and an adder circuit connected to the output of the multiplier and the line delay circuit. The vertical filter further includes a multiplexer connected to the outputs of the first and second multiplier-accumulator sections for alternatively applying the outputs of the first and second multiplier-accumulators to the output of the filter.

REFERENCES:
patent: 3729579 (1973-04-01), DoBoer
patent: 3829670 (1974-08-01), Kebabian
patent: 4282546 (1981-08-01), Reitmeier

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