Patent ID: 6332056
Filing Date: 2001-12-18
Classification: H04N

Abstract:
A circuit arrangement comprising:input means for receiving a video signal containing a brightness component and a color component, said video signal containing a video signal segments representing vertically extending transitions in a visually observable rendition;filter means coupled to said input means for processing one of the brightness and color components of the video signal in conformity with a comb filter principle, said filter means including a direct branch for propagating the processable component of the video signal essentially without delay, a delay branch, including delay means for delaying the processable component of the video signal by the duration of at least one line, and combination means following the direct branch and the delay branch for combining the component of the video signal propagated essentially without delay and the delayed component of the video signal, and for outputting a comb-filtered component of the video signal;a switching stage coupled to an output of the filter means for further processing the comb-filtered component of the video signal;controllable influencing means for terminating the propagation of the comb-filtered component of the video signal to the switching stage, and, at the same time, for activating the propagation of this component of the video signal, in at least essentially non-filtered form, to the switching stage;transition detection means for detecting a vertically extending transition, represented by at least one of the brightness and color components, said transition detection means, upon detection of such a transition, generating characteristic information, and including output means for outputting the characteristic information; andconnection means for connecting the output means of the transition detection means to the controllable influencing means such that, when characteristic information is output via the output means, the controllable influencing means ensures termination of the propagation of the comb-filtered component of the video signal, and activation of the propagation of this component of the video signal in at least essentially of this component of the video wherein said circuit essentially non-filtered form, wherein said circuit comprises:control information generating means inserted in the connection means between the transition detection means and the influencing means for receiving the characteristic information generated by the transition detection means, and for generating, depending on the reception of characteristic information, control information for application to the characteristic information, control said control information enabling termination of the propagation of the comb-filtered component of the video signal and activation of the propagation of the component of the video signal in at least essentially non-filtered form for a period time which is longer than is possible by controllable influencing means using the characteristic information.