Abstract: An adaptive comb filter for separating at least one component of a video signal includes a filter input terminal for receiving the video signal, a first delay device for delaying the video signal by a first interval to produce a first delayed video signal, a second delay device for delaying the video signal by a second interval to produce a second delayed video signal, a first signal subtractor for producing a first difference signal proportional to a difference between the video signal and the first delayed video signal, a second subtractor for producing a second difference signal proportional to a difference between the first delayed video signal and the second delayed video signal, a first signal summing device for producing a first summation signal proportional to a summation of the first difference signal and the second difference signal, a signal selecting device for controllably selecting one of the first difference signal, the second difference signal and the first summation signal as the separated co

Abstract: Intermediate vertical synchronizing signals are generated to occur between the vertical synchronizing signals normally included in a conventional video signal. A first counter counts clock signals which are synchronized with the horizontal synchronizing signals normally included in the conventional video signal to provide a count representing the number of clock signals which are present in one-half of a field interval of that conventional video signal. The count provided by the first counter during the second preceding field interval is temporarily stored and compared to a count produced by a second counter which counts the clock signals from the beginning of the field interval. An intermediate vertical synchronizing signal is generated when the count of the second counter is equal to the stored count.