Patent Document ID: 4458269
Application ID: 06252817
Patent Flag: 1

Claim One:
1. In a television ghost signal cancellation system, including a delay line having a plurality of taps connected to a plurality of weighting function circuits, wherein control of the weighting functions developed by said circuits determines the response characteristic of a transversal filter employing said delay line; an arrangement for detecting the presence of a television ghost signal and its time of occurrence with respect to a reference signal comprising: a source of video signals including a main signal which may be subject to contamination by a ghost signal, and including a main signal component available for use as a training signal, and its corresponding ghost signal components when said video signals are subject to said contamination; means, having an input coupled to said video signal source, and an output, for passing a first signal corresponding to said training signal and subsequent signals corresponding to its ghost signal components, when present; means, having an input coupled to said signal passing means for producing a sampling signal in response to said first signal corresponding to said training signal to the exclusion of said subsequent signals corresponding to its ghost signal components; a serial shift register having an input coupled to receive said sampling signal, and parallel outputs, at which said sampling signal successively appears as it passes through said shift register; a plurality of sampling circuits, each having a control input coupled to a respectively different output of said shift register, and a signal input coupled to the output of said signal passing means, and an output, wherein each of said sampling circuits samples the signal appearing at the output of said signal passing means at the respective time of application of said sampling signal to its control input; and means for coupling the respective outputs of said sampling circuits to respective ones of said weighting function circuits for the development of said weighting functions.