Abstract: A DDC interface circuit includes a first NMOS transistor and a second NMOS transistor. The gates of the first and the second NMOS transistors are all connected to a 3.3V system power via a first resistor. The source of the first NMOS transistor is connected to a DDC_CLK pin of a north bridge. The drain of the first NMOS transistor is connected to a 5V system power via a second resistor, and also connected to an SCL pin of a VGA interface via a third resistor to receive an ACK signal. The source of the second NMOS transistor is connected to a DDC_DATA pin of the north bridge. The drain of the second NMOS transistor is connected to the 5V system power via a fourth resistor, and also connected to an SDA pin of the VGA interface via a fifth resistor.

Abstract: There is provided a color killer circuit comprising a burst amplitude detection unit that detects an amplitude of a color burst; a delay unit that stores, delays, by a predetermined period of time, and outputs the detected amplitude; a subtractor that calculates a difference between an output from the burst amplitude detection unit and an output from the delay unit; a first comparator that compares the output from the burst amplitude detection unit with a first threshold value to determine whether or not the output from the burst amplitude detection unit is less than the first threshold value; and a second comparator that compares an output from the subtractor with a second threshold value to determine whether or not the output from the subtractor is greater than the second threshold value, wherein the color killer circuit masks the color component of the composite video signal when the first comparator determines that the output from the burst amplitude detection unit is less than the first threshold value,

Abstract: In the chroma killer detection for detecting the abnormality of the burst signal, in addition to the circuits (1004, 1005, 1006) for detecting the states of the components of the burst signal, which circuits are for selecting the cos ? data of the burst signal, circuits (1050, 1051, 1052) for detecting the states of the R-Y components, which circuits are for selecting sin ? data are employed for chroma killer detection. Thereby, it is possible to enhance the detection precision of the abnormality states of the burst signal and the precision for discrimination of the broadcasting system.

Abstract: A conventional method to determine an onset point of a color killer function by design of the external circuit requires physical work to change external parts and their component values varying from one model to another. Therefore, an alternative method to adjust the onset point of the color killer function without requiring such work has been sought for. This invention offers a color killer adjustment device, which adjusts the onset point of the color killer function to switch off the color signal in video signals, having a CPU to store and output a control signal to determine the onset point of the color killer function, a color killer control circuit which generates the reference voltage corresponding to the control signal from the CPU and a comparator which compares a signal representing the level of the color burst signal in the color signal with the reference voltage and outputs a signal to disable the color signal in the video signals according to a result of the comparison.

Abstract: A conventional method to determine an onset point of a color killer function by design of the external circuit requires physical work to change external parts and their component values varying from one model to another. Therefore, an alternative method to adjust the onset point of the color killer function without requiring such work has been sought for. This invention offers a color killer adjustment device, which adjusts the onset point of the color killer function to switch off the color signal in video signals, having a CPU to store and output a control signal to determine the onset point of the color killer function, a color killer control circuit which generates the reference voltage corresponding to the control signal from the CPU and a comparator which compares a signal representing the level of the color burst signal in the color signal with the reference voltage and outputs a signal to disable the color signal in the video signals according to a result of the comparison.

Abstract: The system and software of the present invention presents a process for translating a source palette containing TV unsafe colors into a resultant modified palette containing only TV safe colors, while preserving the color trends in the source palette. The software will first analyze a source color palette to determine the TV unsafe colors contained therein. For each TV unsafe color in the source color palette, the software determines the closest TV safe color by selecting a TV safe color that is the shortest Euclidean distance from the TV unsafe color. The TV unsafe colors are substituted with the calculated TV safe colors and stored in the resultant palette. The software will divide the color space of the source palette into discrete regions, e.g., by Hue (H), by selecting reference colors as the boundaries of the regions. The initially TV safe color will then be modified in a manner similar to the modifications made on nearby reference colors that were required to make them TV safe.

Abstract: The system for viewing color video "automatically" enables and disables a color killer circuit (monochrome/color mode) so that the color video may be viewed in monochrome. Enabling and disabling the color killer circuit for the current system may be accomplished, in part, by dynamic operation of the television. In operation the user may select one of three methods of activating the monochrome/color mode to enable the color killer circuit. First, the monochrome/color mode may be activated for one or more preselected channels. Second, the monochrome/color mode may be activated for all channels. Third, the monochrome/color mode may be activated if a control signal is included within the television broadcast indicating that the particular video being received is a colorized monochrome video. To deactivate the monochrome/color mode may be accomplished by any of four deactivation methods that disable the color killer circuit. First, the monochrome/color mode may be deactivated by turning the television off and on.

Abstract: A video signal copying apparatus for copying a signal recorded on a recording medium onto other recording media is provided.

Abstract: An apparatus for automatically switching broadcasting systems and controlling method thereof controls switching between an NTSC system and a PAL-M system according to the detected number of color killer signals. A stabilized broadcasting system is set to either the NTSC system or the PAL-M system when the broadcasting system is switched between the PAL-M system and the NTSC system by more than the predetermined times in the broadcasting signal receiving system capable of receiving both NTSC broadcasting system and PAL-M broadcasting system to provide a high picture quality images.

Abstract: In a color signal processing circuit capable of processing a PAL/NTSC color television signal, in order to prevent an image deterioration caused by chromatization when a PAL signal is received in an NTSC signal receiving mode, there is provided a gate control signal generating circuit for alternately generating gate control signals "GA" and "GK", one for one horizontal period and the other for a next one horizontal period, in response to application of a phase inverting pulse "R" which inverts in polarity every one horizontal period.

Abstract: A television circuit (10) according to the invention includes a multiplier (12), and a voltage signal (V1) is outputted from an LPF (22) in accordance with the presence or absence of a color burst signal which is to be inputted to the multiplier (12). A rectangular-wave signal (Va) is obtained on the basis of the voltage signal (V1) through a peak holding circuit (24) and a sampling/holding circuit (42). A rectangular-wave signal (Vc) is obtained by averaging the rectangular-wave signal (Va) and a rectangular-wave signal (Vb) which is obtained by delaying the signal (Va) by a 1H delay circuit (44) by an adder (46) and a 1/2 multiplication circuit (48). On the basis of the rectangular-wave signal (Vc), a voltage signal (V3) is produced by an LPF (52) having a relatively small time constant, which is compared with a reference voltage (Vref) by a level-comparator (54), whereby a signal is outputted. The signal is used as a color killer signal for a color killer circuit, for example.

Abstract: An automatic color control and chroma killer circuit 3 and video processing system is provided that is capable of controlling an amplitude of a color signal and of performing a killer function with a simple construction without using a divider and/or vertical filter. The ACC/ACK device includes ACC and ACK circuitry which may be selectively enabled with operating signals to a selector 27. When the selector 27 enables amplitude detector 25, the amplitude detector 25 detects amplitude of the input color signal and a coefficient controller 26 compares it with a killer level. If the input color signal fails to meet the killer level then the coefficient controller 26 controls a coefficient generated by the coefficient generator 22 to perform a killer operation. The ACC operation and circuitry is thereby ACK controlled until an input color signal meets or exceeds the killer level.

Abstract: A chrominance signal processing apparatus for a digital television receiver, comprising an A/D converter for converting a transmitted analog composite video signal into a digital signal in response to a clock frequency, a luminance/chrominance separation circuit for separating luminance and chrominance signals from an output signal from the A/D converter, a delay circuit for delaying the separated luminance signal for a predetermined time period, an ACC circuit for controlling an amplitude of the separated chrominance signal, a chrominance demodulator for detecting color difference signals from an output signal from the ACC circuit, a color killer circuit for detecting a maximum amplitude value of a color burst signal from the separated chrominance signal to generate a color killer signal, a first multiplexing circuit for selecting one of the output signal from the A/D converter and an output signal from the delay circuit in response to the color killer signal, a second multiplexing circuit for selecting the

Abstract: In an image pickup apparatus having a low-pass filter for detecting a luminance component of an image pickup signal and a band-pass filter for detecting a contour component of the image pickup signal, a digital system for performing a digital signal processing action is arranged to have the low-pass filter and the band-pass filter not cascade-connected to each other. The arrangement is such that the signal processing action is performed without bringing about any spurious contour, any deterioration in frequency characteristic, etc., due to place cancelling peculiar to a digital system. The apparatus reduces the possibility of deterioration of images, permits simplification of circuit arrangement, permits reduction in electric energy consumption and in scale of the circuit, and thus facilitates adoption of an integrated circuit arrangement.

Abstract: An automatic color control and chroma killer circuit 3 and video processing system is provided that is capable of controlling an amplitude of a color signal and of performing a killer function with a simple construction without using a divider and/or vertical filter. The ACC/ACK device includes ACC and ACK circuitry which may be selectively enabled with operating signals to a selector 27. When the selector 27 enables amplitude detector 25, the amplitude detector 25 detects amplitude of the input color signal and a coefficient controller 26 compares it with a killer level. If the input color signal fails to meet the killer level then the coefficient controller 26 controls a coefficient generated by the coefficient generator 22 to perform a killer operation. The ACC operation and circuitry is thereby ACK controlled until an input color signal meets or exceeds the killer level.

Abstract: A method and circuit for preventing the deterioration of picture quality in a video processor is disclosed in which, when an input color video signal is input, a clock signal for a combfilter is locked with a phase-locked loop (PLL) by a burst signal and when a monochrome video signal without the burst signal is input, the clock signal is locked by the output (quasi-burst signal) of a voltage-controlled oscillator of the PLL circuit, before the lapse of one horizontal period, so that the clock signal is constantly locked by a multiple (4 fsc) of the burst signal regardless of the presence or absence of the burst signal of the input video signal. According to a color/mono signal discriminating result, either the burst signal or the quasi-burst signal is selected as a reference signal so that the reference signal is locked to provide a clock signal having a constant phase and frequency, thereby preventing aliasing due to clock variations when the monochrome signal is input and thus improving picture quality.

Abstract: A signal demodulation device includes a change point sensing circuit which senses a change point of an envelope of a DPSK signal, and a range setting circuit which generates a gate pulse corresponding to a period in which the DPSK signal cannot be changed. An output signal of the change point sensing circuit and the gate pulse are inputted to an AND gate so that a trigger prohibition signal is obtained. The trigger prohibition signal and the output signal of the change point sensing circuit are inputted to a NOR gate so that a trigger pulse corresponding only to a normal change point of the DPSK signal is generated, so that DPSK modulation data is obtained.