Adaptive multistandard video comb filter

Abstract From the Canadian patent

RCA 85,616, Abstract of the Disclosure A multimode comb filter for comb filtering e.g. NTSC, and/or PAL video signals includes delay means for concurrently providing video signals representing three adjacent horizontal lines. First and second combining means coupled to the delay means provide alternate l-H comb filtered signals in both the NTSC and PAL modes. Control circuitry coupled to the delay means generates a control signal for adaptively selecting the one of the alternate l-H comb filtered signals or appropriate proportions of both alternate l-H comb filtered signals to form an output comb filtered signal.