Abstract: A logical comb filter comprises a first delay circuit receiving an input composite video signal called a succeeding signal for delaying the received succeeding signal by one scan line period so as to output a main signal composed of the delayed succeeding signal, and a second delay circuit receiving the main signal for delaying the received main signal by one scan line period so as to output a preceding signal composed of the delayed main signal. An addition circuit is connected at its first input to receive the main signal. A selection and control circuit receives the succeeding signal, the main signal and the preceding signal for supplying the succeeding signal to a second input of the addition circuit when the relation of the main signal>(is greater than) the succeeding signal>the the preceding signal or the relation of the preceding signal>the succeeding signal>the main signal is satisfied.

Abstract: A color signal processing device for processing a carrier chrominance signal is arranged to produce a first sampling signal by sampling the carrier chrominance signal according to a sampling clock signal synchronized with a reference phase of the carrier chrominance signal and a second sampling signal which is of a sampling phase opposite to that of the first sampling signal and to form baseband signals conforming to a color signal by using the first and second sampling signals. This arrangement enables the device to process the color signal without causing any signal deterioration that tends to result from DC fluctuations of the carrier chrominance signal.

Abstract: Simplified apparatus for controlling the phase and amplitude of the chroma subcarrier of a television signal is disclosed. The phase control includes compensation so that the color burst amplitude is stable as the phase is varied.

Abstract: A state memory circuit responsive to a selection signal indicative of either the first television system or the second television system selected according to an external setting operation and adapted to be set to a logical "1" or "0" state when the selection signal indicates that the first television system is selected, the state of the state memory circuit being alternated between "1" and "0" for every signal according to the burst flag pulse when the selection signal selects the second television system, and a timing circuit for outputting the state of the state memory circuit at a timing before a leading edge of the burst flag pulse or after a trailing edge of the burst flag pulse and responds to an even number of burst signals in one frame and generates a color video signal suitable to the first or the second television system according to the selection signal.

Abstract: A video signal processor is used in connection with a television set or similar apparatus for processing a video signal input for every horizontal line period. A video signal is processed by operations such as comparison and addition of a video signal, a first delay signal which is delayed by a one-horizontal line period and a second delay signal which is delay by a two-horizontal line period. Since there is a horizontal correlation in a video signal, it is possible to separate a color signal from a luminance signal and remove the noise component from the luminance signal by a predetermined operation. The comparison is substantially the subtraction of the signals which are output one after another by a delay of one horizontal line period in series, thereby avoiding such trouble as color edging.

Abstract: Three chrominance signals representative of a color image are represented by a coordinate system in a uniform color space, and a probability of occurrence of colors on the color space and a correlation of the chrominance signals for pixels are referenced in encoding color image information signals.

Abstract: Cross color from composite television signals is suppressed by averaging baseband chrominance samples spaced a certain number of frames apart, or when motion is detected in the television signals, by averaging baseband chrominance samples spaced a certain number of lines apart. Cross color suppression when motion is detected may be improved by low-pass filtering the line-spaced chrominance sample average. Both NTSC and PAL implementations are presented.

Abstract: A fixed filter determines a lower portion of the amplitude characteristic of a chrominance signal sideband correction filter. A variable filter determines the upper portion of the amplitude characteristic. A control signal tunes the variable filter for providing a symmetrical response for video signals having balanced color sidebands and tunes the variable filter for providing an asymmetrical response for video signals having unbalanced sidebands.

Abstract: Apparatus that is self-contained with video equipment, such as a video camera or video record/playback device, and which generates video signal adjustment data for use by video signal processing circuits that are included in such video equipment. An input video signal is coupled to luminance and/or chroma digital signal processing circuits which are supplied with luminance or chroma adjustment control data, respectively, for subjecting the input video signal to predetermined luminance or chroma adjustment operations, thereby producing adjusted digital luminance and chroma signals, respectively. At least one of the adjusted digital luminance and chroma signals is sampled at preselected times; and the sampled digital signals are used by an adjustment control data generator for generating the luminance and/or chroma adjustment control data that are supplied to the luminance and/or chroma digital signal processing circuits.

Abstract: A circuit for a video camera for color separation and contour correction which can perform color separation and contour correction of a signal from a charge coupled device image sensor specifically utilizing two 1H (1 horizontal period) delay elements. The circuit adds a 2H delayed chrominance signal from a delay unit and a current input chrominance signal. This sum is then decreased by one-half. The circuit separates red and blue components of the chrominance signals decreased by half and from the 1H delayed chrominance signal from the delay unit. Next, vertical and horizontal contour correcting signals are generated in response to the 1H delayed chrominance signal from the delay unit and in response to the output of an amplifying unit. Thus, the present invention uses two 1H delay elements to perform color separation as well as contour correction to thereby simplify the overall circuit design.