Abstract: A CCD comb filter and color demodulation system is described for use in a color television receiver. The system includes a CCD comb filter receiving a video signal having interleaved luminance and color components, the latter components including a color subcarrier at a nominal frequency. Preferably, the comb filter includes but two CCD devices which receive the input video signal and apply their sampled outputs to a summer to develop combed luminance components and combed color components which occupy different frequency bands. The combed color components include a color subcarrier and sidebands which are translated upward in frequency by a given multiple of the nominal subcarrier frequency. The latter components are applied to a pair of CCD output filters which are clocked to sample the color components at the given multiple of the nominal subcarrier frequency for developing baseband demodulated color signals.

Abstract: A luminance signal processing circuit for a television receiver comprises means for separating a full bandwidth luminance signal into a low pass component and first and second derivative components of the low pass component. A differential amplifier is responsive to the component voltage signals for developing first and second current mode signals representing in phase and 180.degree. out of phase combinations of the low pass and second derivative components. The levels of the second derivative components of the first and second current mode signals are selectively adjusted by a peaking signal processor for developing related third and fourth current mode signals whose amplitudes are also selectively adjusted by a picture signal processor for developing an output luminance voltage having selectively controlled contrast and peaking components.

Abstract: A method and apparatus is disclosed for peaking the amplitude transitions of an information-bearing signal such as a video signal. From the video signal, a control signal and a peaking signal are developed, each having magnitude variations related to and occurring in time correlation with amplitude transitions in the video signal. The control signal is employed to modulate the peaking signal such that when transitions in the control signal exceed a threshold amplitude, the peaking signal is coupled to an output terminal at or above a given gain level, and when the transitions in the control signal are less than the threshold amplitude, the peaking signal is coupled to an output terminal at a reduced but non-zero gain level. The modulated peaking signal appearing at the output terminal is combined with the video signal to cause relatively high level video transitions to receive a high level of peaking and relatively lower level video transitions to receive lesser peaking.

Abstract: A spot arrest system modulates cathode ray tube beam scanning speed in accordance with compressed and noise-processed image enhancement signals derived from video signal transitions. A generator provides first derivative type image enhancement signals which are compressed by a log amplifier. The log amplifier tends to equalize the amplitude of the image enhancement signals for various video transitions at an optimum amplitude. The signals are then applied to a noise processor which attenuates image enhancement signals which do not correlate to first derivatives of the corresponding video signals. In the noise processor, a multiplier receives as one input the compressed image enhancement signals and receives as another input control signals based on first derivatives of the video signals. The noise-processed signals are then coupled to the cathode ray tube to modulate the beam scan speed. Additionally, beam current may be modulated inversely with respect to the beam scan speed modulation.