Abstract: Disclosed are methods, apparatuses, and systems for encoding and decoding an image. The present invention provides an intra prediction unit receives an input image, removes high frequency ingredients by low pass filtering an encoded luma pixel value in the input image during intra prediction, and generates a prediction block by predicting a chroma pixel value by using a low pass filter (LPF) LM chroma mode for applying an LM chroma mode, which is an extended chroma mode technique for generating a prediction block by predicting the chroma pixel value by applying a correlation between color planes to the luma pixel value having removed therefrom the high frequency ingredients.

Abstract: An image scale device for up-scaling an input image by generating data signals for a plurality of additional pixels, the additional pixels added to the input image to generate an up-scaled image, the device comprising an RGB interpolator configured to generate red (R), green (G), and blue (B) data signals for each of the additional pixels on the basis of the R, G, and B data signals of an arbitrary pixel among pixels of the input image that are adjacent to the respective additional pixel, and a W interpolator configured to generate a white (W) data signal for each of the additional pixels on the basis of W data signals of the pixels of the input image that are adjacent to the respective additional pixel.

Abstract: An image scale device for up-scaling an input image by generating data signals for a plurality of additional pixels, the additional pixels added to the input image to generate an up-scaled image, the device comprising an RGB interpolator configured to generate red (R), green (G), and blue (B) data signals for each of the additional pixels on the basis of the R, G, and B data signals of an arbitrary pixel among pixels of the input image that are adjacent to the respective additional pixel, and a W interpolator configured to generate a white (W) data signal for each of the additional pixels on the basis of W data signals of the pixels of the input image that are adjacent to the respective additional pixel.

Abstract: Disclosed are methods, apparatuses, and systems for encoding and decoding an image. The present invention provides an intra prediction unit that receives an input image, calculates a correlation between a Luma area block and Chroma area block in the input image in intra prediction, removes high frequency ingredients by low-pass filtering an encoded luma pixel based on the calculated correlation, and generates a prediction block by applying an LM chroma mode, which is an extended chroma mode technique, to the luma pixel removed therefrom the high frequency ingredients.

Abstract: A method for providing tracking error signals in an optical data storage system includes a step of receiving a wobble signal having a first frequency from the wobble detection system. The wobble detection system includes an optical pick up unit that detects positions of the head relative to lands and grooves. Characteristically, the wobble signal is amplitude modulated for positions intermediate between the land and the groove. The method further includes a step of receiving a primary tracking error signal from the wobble detection system. The wobble signal is multiplied with a synchronous signal to about a product signal. The product signal is positive for a first direction of motion and negative for a second direction of motion that is opposite that of the first direction. The product signal is integrated to obtain a quadrature track error signal.

Abstract: Systems and methods are provided for automatically re-ranging a satellite terminal. A satellite system may comprise a satellite comprising an inroute channel and an outroute channel, and a terminal configured to receive an outroute signal from the satellite on the outroute channel and transmit an inroute signal to the satellite on the inroute channel. The satellite terminal may automatically determine when to perform ranging by monitoring the quality of the outroute signal; monitoring the quality of the inroute signal; and determining if there has been a sustained degradation in the monitored inroute signal quality or the monitored outroute signal quality.

Abstract: A method for providing tracking error signals in an optical data storage system includes a step of receiving a wobble signal having a first frequency from the wobble detection system. The wobble detection system includes an optical pick up unit that detects positions of the head relative to lands and grooves. Characteristically, the wobble signal is amplitude modulated for positions intermediate between the land and the groove. The method further includes a step of receiving a primary tracking error signal from the wobble detection system. The wobble signal is multiplied with a synchronous signal to about a product signal. The product signal is positive for a first direction of motion and negative for a second direction of motion that is opposite that of the first direction. The product signal is integrated to obtain a quadrature track error signal.

Abstract: An image processor that corrects an image signal, includes: a brightness component correction amount calculating section that calculates the amount of correction of a brightness component of the image signal only for an image signal in a predetermined brightness level range of a predetermined spatial frequency band; and a brightness component correcting section that corrects the brightness component of the image signal by using the amount of correction calculated by the brightness component correction amount calculating section.

Abstract: A video decoder that separates and analyzes analog video signals includes a hue and saturation separator and a video signal determiner. The hue and saturation separator demodulates from a component video signal chroma signal, which includes a hue signal and a saturation signal. The video signal determiner determines at least one video signal characteristic of the component video signal dependent on the hue and saturation signal. The video signal determiner may include a mode determiner that determines the encoding standard of the video signal, and a color burst determiner that determines a location of a color burst signal with the video signal. The mode determiner may include a signal lock detector, a sequence matcher, and an encoding mode selector. The color burst determiner may include an absolute value determiner and a burst position determiner.

Abstract: An image processor that corrects an image signal supplied to an image display section, includes: a luminance component correction amount calculating section that calculates the amount of correction of a luminance component of the image signal according to visual environment only for an image signal in a predetermined luminance level range in a predetermined spatial frequency band; and a luminance component correcting section that corrects the luminance component of the image signal using the amount of correction calculated by the luminance component correction amount calculating section.

Abstract: Method and system for enhancing color saturation. According to an embodiment the present invention provides a method for enhancing color saturation. The method includes providing a color image characterized by a luminance component and two chrominance components, the color image including a plurality of pixels, the plurality of pixels including a first pixel being characterized at least by a luminance value, a first chrominance value, and a second chrominance value. The method also includes processing the first chrominance value and the second chrominance value. The method further includes determining a saturation level using based on the first chrominance value and the second chrominance value. Moreover, the method includes providing a factor for adjusting the first chrominance value and the second chrominance value, the factor being based on the saturation level. Furthermore, the method includes adjusting the first chrominance value and the second chrominance value using the factor.

Abstract: An image processing method and its associated image processing circuit for processing an image based on a sequential couleur avec memoire (SECAM) system are provided. The image includes a first pixel, a second pixel and a third pixel, which are successively arranged in a same vertical line and are respectively corresponding to a first image signal and a second image signal and a third image signal. The image processing method includes steps of calculating a chroma signal via a vertical filtering process according to the first image signal, the second image signal and the third image signal; calculating a chroma angular frequency via a frequency modulation process according to the chroma signal; and generating a chromaticity according to the chroma angular frequency.

Abstract: A video decoder that separates and analyzes analog video signals includes a hue and saturation separator and a video signal determiner. The hue and saturation separator demodulates from a component video signal chroma signal, which includes a hue signal and a saturation signal. The video signal determiner determines at least one video signal characteristic of the component video signal dependent on the hue and saturation signal. The video signal determiner may include a mode determiner that determines the encoding standard of the video signal, and a color burst determiner that determines a location of a color burst signal with the video signal. The mode determiner may include a signal lock detector, a sequence matcher, and an encoding mode selector. The color burst determiner may include an absolute value determiner and a burst position determiner.

Abstract: According to embodiments, a color signal processing circuit includes: an A/D converter configured to convert an analog television signal into a digital signal by using a clock; a color signal demodulation circuit configured to color-demodulate the television signal converted into the digital signal by the A/D converter; a clock generation section configured to generate the clock that is used by the A/D converter; and a frequency control section configured to control the clock frequency of the clock generation section on the basis of a color subcarrier frequency of a color signal included in the analog television signal and on the basis of the vertical synchronization signal frequency of the analog television signal.

Abstract: A video signal processing apparatus may include a frame memory and a separator and deinterlacer circuit. The frame memory may store an interlaced video signal. The separator and deinterlacer circuit may execute operations of separating and deinterlacing the interlaced video signal stored in the frame memory. The apparatus may output a sequential video signal. A data processing system may include the video signal processing apparatus. A method for processing video signals may include storing an interlaced video signal in a frame memory and executing operations of separating and deinterlacing the interlaced video signal stored in the frame memory. The method may also include outputting a sequential video signal.

Abstract: A method of composite decoding in which the input signal is converted into the frequency domain, and the symmetry of frequency components with respect to the subcarrier frequency is compared. The comparison is varied in dependence upon the frequency being processed. In this way, the separation can be adapted to suit known characteristics of different portions on the input spectrum. This is particularly useful for processing NTSC signals. The allocation of a particular component to chrominance may be biased in dependence upon a measure of the luminance information of the composite signal at a corresponding spatial frequency.

Abstract: A color reconstruction system for an SECAM television signal includes a luminance and chrominance separator and color decoder, first and second line buffer blocks, a vertical similarity calculator and a reconstructor. The luminance and chrominance separator and color decoder receives and filters an SECAM television signal with a luminance and a chrominance to produce a luminance signal and a chrominance signal. The first line buffer block temporarily stores the luminance signal. The second line buffer block temporarily stores the color difference signal. The vertical similarity calculator produces an upper similarity coefficient and a lower similarity coefficient based on the luminance signals produced by the luminance and chrominance separator and color decoder and temporarily stored in the first line buffer block respectively.

Abstract: A memory accessing apparatus and a method thereof are provided, which are suitable for methods and apparatuses that access memory data in blocks, such as a video decoder. An advanced memory mapping method is adopted to generate the column address and row address of a data word in a memory based on the logic address of the data word in a video frame. Macroblocks are organized into clusters, macroblocks of the same cluster are stored in the same row of the memory, and the orders in which the video decoder reads and writes macroblocks are rearranged so as to reduce the number of row changes in memory access and improve the throughput of memory access. Furthermore, memory accesses between the video decoder and the display controller can be coordinated.

Abstract: In a receiver, a synchronization circuit (MIX2, OSC, C1, R1) provides a set of oscillator signals (OSI, OSQ) that are synchronized with a carrier of an amplitude-modulated signal. The set of oscillator signals (OSI, OSQ) comprises a quadrature oscillator signal (OSQ), which is substantially 90° phase shifted with respect to the carrier of the amplitude-modulated signal. A quadrature mixer (MIX2) mixes the quadrature oscillator signal (OSQ) with the amplitude-modulated signal so as to obtain a quadrature mixer output signal (MO2a). A phase-error corrector (PEC) adjusts the phase of the oscillator signals in response to a variation in the magnitude of an alternating current component (AC) in the quadrature mixer output signal (MO2a).

Abstract: A system for adjusting color image quality includes converting color video signal sources into component video signals including a luminance signal and chrominance signals. A signal axis rotation circuit performs coordination transformation on the chrominance signals in accordance with a hue calibration parameter; and a multiplier multiplies the coordinate-transformed chrominance signals with a chroma calibration parameter to obtain output chrominance signals. The output chrominance signals and the luminance signal together form a component chrominance signal, which is applied to and output by a chrominance signal inverse conversion unit.

Abstract: The present invention relates to a method and corresponding system for improving the perceived visual quality of images for instance displayed on a color television screen. According to the invention, there is provided a means for carrying out histogram processing (13) for scaling an input video signal (6) such that the maximum dynamic range is utilised and where the quality of the perceived image is also optimised. According to the invention, the histogram processing (13) provides a transfer function for the image pixels to obtain enhanced image dynamics and also to provide a chrominance gain (gc) for scaling the chrominance components, when the luminance has been changed by the histogram processing. According to the invention, the histogram processing can also take variations of the ambient light into account (5).

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 video decoder removes noise caused by a luminance signal component when separating a chrominance signal from a composite video baseband signal. The video decoder includes a first signal generator generating a first signal, a second signal generator generating a second signal, a third signal generator differentiating the first and second signals and performing a predetermined operation on the differentiated signals to generate a third signal, an operating unit performing a predetermined operation on the third signal to output the chrominance signal, a fourth signal generator performing a predetermined operation on the first and second signals to generate a fourth signal having a value corresponding to the amplitude of the chrominance signal, and a noise removal unit correcting the chrominance signal in response to the third and fourth signals to remove luminance component noise included in the chrominance signal.

Abstract: A delay circuit is disclosed. A switched-capacitor group includes a plurality of switched-capacitor units, each of which have a switching element and a capacitive element charged/discharged by turning on/off the switching element. The switched-capacitor units are connected such that the input signal is input in common to all of the switched-capacitor units and the capacitive elements are charged as well such that the capacitive elements are discharged to allow the output signal to be output from the switched-capacitor units. A switching control unit performs on/off control of the switching elements to cause the capacitive elements to be charged in sequence based on the input signal, causing the capacitive element charged last time to be discharged to allow the output signal to be output in sequence from the switched-capacitor units, and performs control of all of the switching elements to be turned off upon on/off switching of the switching elements.

Abstract: A method of composite decoding in which the input signal is converted into the frequency domain, and the symmetry of frequency components with respect to the subcarrier frequency is compared. The comparison is varied in dependence upon the frequency being processed. In this way, the separation can be adapted to suit known characteristics of different portions on the input spectrum. This is particularly useful for processing NTSC signals. The allocation of a particular component to chrominance may be biased in dependence upon a measure of the luminance information of the composite signal at a corresponding spatial frequency.

Abstract: A delay circuit acquiring an output signal delayed from an input signal, comprising: a switched capacitor group that includes a plurality of switched capacitor units, wherein each of the plurality of switched capacitor units has a charging MOS transistor and a discharging MOS transistor, and a capacitive element which is connected to sources of the charging and the discharging MOS transistors; and a switching control unit that performs on/off control of the charging and the discharging of the MOS transistors, to cause each of the capacitive elements to be charged in sequence based on the input signal, and that, upon causing the each of the capacitive elements to be charged in sequence based on the input signal, causes the capacitive element charged last time to be discharged, to allow the output signal to be output in sequence.

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: We describe an apparatus and method for decoding a SECAM chrominance signal. The apparatus may include a band-pass filter to separate the chrominance signal from the composite video baseband signal. A down-mixer down mixes the chrominance signal from a high to a low frequency band to generate two signals having a substantially 90° phase difference. A cloche filter filters the two signals. A differentiator differentiates the cloche filtered signals. A multiplier squares each differentiated signal. An adder sums the squared result while a square root takes the square root of the sum.

Abstract: A method (100) of demodulating a real two-dimensional pattern (110) is disclosed. The method (100) estimates (120, 130) a quadrature two-dimensional pattern from the real two-dimensional pattern (110) using a smooth phase only transform having an anti-symmetric phase, such as a spiral phase filter (140). A demodulated image is created by combining (180) the real two-dimensional pattern (110) and the estimated quadrature two-dimensional pattern.

Abstract: Systems and method are provided for luma-chroma separation. A demodulator system demodulates a composite video signal to produce at least two baseband chroma signals. A given baseband chroma signal contains chroma information for one of a plurality of video frames comprising the composite signal. A three-dimensional (3-D) comb filter removes luma information from a given baseband chroma signal by combining sets of at least two baseband chroma signals to form a 3-D filtered baseband signal.

Abstract: When an A/D-converted composite video signal is directly outputted while a system clock frequency is switched so as to execute the determination of a signal system, a digital chroma demodulation system prevents the images displayed by the composite video signals from being distorted in accordance with a switching of the frequency of a system clock. The frequency m (=fsc×n) of the system clock is synchronized with a color burst signal and is set to fall in a predetermined range by changing a coefficient n in accordance with the system color burst signal freguency. Thus, since a composite video signal is A/D-converted in accordance with a substantially constant sampling frequency, the sampling condition such as a sampling frequency and a sampling point is not greatly changed.

Abstract: An apparatus for recovering a chrominance signal from a sequential color with memory (SECAM) composite video baseband signal (CVBS), and more particularly, to a frequency demodulator and method of recovering a SECAM chrominance signal which can utilize both a real number portion and an imaginary number portion, and generate a frequency-demodulated chrominance signal using an arctangent approximation, and thereby can simplify a circuit configuration of a frequency demodulator to perform a fixed-point calculation is provided.

Abstract: An NTSC system chrominance signal demodulation apparatus is provided with a clock timing change circuit for burst-locking an input signal under the state where the phase is shifted by 90 degrees for every line, and phase axis rotation circuits for performing phase axis rotation, thereby to enable conversion of the phase axis of the burst signal. Therefore, demodulation of a PAL system chrominance signal can be carried out as well as demodulation of an NTSC system chrominance signal, and thereby demodulation of chrominance signals can be carried out using a common device regardless of the broadcast systems such as NTSC and PAL. Further, demodulation of chrominance signals can be carried out even under adverse conditions such as weak electric field or level compression of the burst signal.

Abstract: A color demodulation circuit that can complement an unstable state of an output from an ACC circuit and can obtain stable color-difference outputs, regardless of a burst signal in a chrominance carrier signal. Normally, a selector connects an output from a first multiplier that controls an amplitude of an output from a band-pass filter using an output from the ACC circuit, to a color-difference output demodulation circuit. However, during a period in which there are abrupt changes in the burst signal, for example during a period in which the output from the ACC circuit becomes unstable such as at switching between a state including a burst and a state not including a burst, the selector connects an output from a second multiplier that controls the amplitude of the output from the band-pass filter using an ACC output monitor signal, to the color-difference demodulation circuit.

Abstract: A vector waveform rotation device (60) for rotating a vector waveform displayed on a vector comprises rotation amount setting means (5?) for holding a rotation amount ?, and means (6?) for inputting a first color difference signal (B-Y signal) and a second color difference signal (R-Y signal) demodulated from a chrominance signal of a composite video signal as x and y, and rotating a vector (x, y) by generating a vector (x?,y?)=(x·cos ??y·sin ?, x·sin ?+y·cos ?) from the vector (x,y)=(first color difference signal, second color difference signal).

Abstract: Provided are decoding methods and decoders for separating luminance and chrominance components of a video signal. In one aspect, a reference subcarrier of a first line of the video signal is used for subsequent lines by applying an appropriate rotation to the reference subcarrier of the first line for each subsequent line. In another aspect, comb filtering is adaptively controlled based on determining whether 90 or 180 degrees relationship is maintained from line to line. In a further aspect, both complimentary and non-complimentary comb filtering are implemented. In yet another aspect, SECAM bell filtering is achieved by rotating the video signal to obtain a baseband signal, low-pass filtering and modulating the baseband signal, and subtracting the modulated low-pass filtered baseband signal from the video signal to notch the chroma component from the luma component.

Abstract: A color demodualation device having an AD converter, a phase signal generator, a burst data generator and a multiplier. The AD converter produces digital samples of chrominance signal at a frequency four times a color subcarrier frequency, and the phase signal generator generating a phase signal for identifying phases of a burst signal and color subcarrier signals modulated by respective B-Y and R-Y signals. The burst data generator produce burst data corresponding to the burst signals modulated by respective B-Y and R-Y signals. The burst respective color subcarrier signals according to the phase signal. The multiplier produces products of the burst data and the digital samples of the chrominance signal, from which digital samples of the respective R-Y and B-Y signals are produced.

Abstract: Method and apparatus for automatically enhancing the foliage display of a color signal includes providing the color signal in multiplexed form having alternating first and second components, the first component being substantially aligned with a flesh tone color space axis, the second component being substantialy aligned with a green tone color space axis. A de-multiplexing unit separates the first and second components to provide a first de-multiplexed component substantially aligned with the flesh tone axis and a second de-multiplexed component substantially aligned with the green tone axis.

Abstract: A background (sky box) in a video game or other virtual reality environment dynamically changes as a function of a parameter, producing a more realistic display. Luminance-only texture and color texture data are employed to create the background. The color texture data are provided as a lookup table in which one axis of the lookup table corresponds to time or another variable, and the other axis indicates the colors of pixels in the display as a function of the altitude or azimuth of the pixels. The luminance-only texture data are thus modulated by the chrominance values from the color texture data for pixels in the background. Optionally, one of a plurality of two-dimensional color textures can be selected as a function of the variable and applied to the luminance-only texture data.

Abstract: A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin ?) of the phase shift input signal (?) and a reversed sine-converted output signal (?sin ?) of the phase shift input signal (?), a cosine generation circuit generating a cosine-converted output signal (cos ?) of the phase shift input signal (?), a first multiplication circuit, a second multiplication circuit, a third multiplication circuit, a fourth multiplication circuit, a first addition circuit adding an output signal of the first multiplication circuit to an output signal of the second multiplication circuit, and a second addition circuit adding an output signal of the third multiplication circuit to an output signal of the fourth multiplication circuit. This configuration makes the construction of a phase shift circuit for tint adjustment simple because of a coordinate transformation embedded in the configuration.

Abstract: A chroma-decoder 1 has two SRCs 17 and 21. The first SRC 17 performs down-conversion, changing the sampling rate of a composite video signal sampled with a system clock signal Cs to the sampling rate (14.3 MHz) of an NTSC signal. The signal generated by the SRC 17 is output in synchronism with the system clock signal Cs. The signal is then divided into a luminance signal Y and a color-difference signal C, which are subjected to chroma decoding. The second SRC 21 performs down-conversion, changing the sampling rate of the luminance signal and color-difference signal of the NTSC signal to the sampling rate (13.5 MHz) of an ITU-R601 standard.

Abstract: A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominator filters operating on the modulated color information, and a divider providing a ratio result by dividing the numerator filter output by the denominator filter output. The demodulator may include two sets of numerator and denominator filters offset in phase from one another, where one of the two sets is selectively employed in order to mitigate divide-by-zero problems. Also disclosed are methods for demodulating digitized FM color signals in a SECAM decoder.

Abstract: A method and system are provided for balance control for component video signals. The system and method of the present disclosure allow for adjusting or compensating for possible color encoding errors, as well as allowing individual viewer preferences to be accommodated, in consumer electronics devices, such as high definition monitors and other imaging devices and appliances. The system includes circuitry for receiving the U and V component video signals and outputting balance adjusted component color difference signals Uout and Vout.

Abstract: By taking into account the individual positions of the sub-pixels (108-118) on a color matrix display device (100); the apparent resolution can be increased. Sub-pixel sampling to determine samples at the correct position is incorporated in the image scaling filter (502). The filter response is such that the useful resolution inherent in the color matrix display device (100) can be used. In the filter design, a trade-off is made between sharpness and color errors.

Abstract: A method and system enhances the color of an image by manipulating the chrominance and/or luminance signals of the image. Specifically, a color enhancement system sharpens color changes for better picture quality on digital display systems. In one embodiment of the present invention, color changes are detected by a color change detection unit. If the color changes are significant, a color change sharpening unit sharpens the color change to enhance the image.

Abstract: A color system discriminator is provided with a frequency detector, a vertical-synchronizing frequency detector, a plurality of color demodulators, a demodulating switch, and a controller. The type of the color system of a received signal is determined with reference not only to the burst lock frequency indicated in the tuner detection signal and the phase of the R-Y color difference signal of the image signal, but also to the frequency of the sound carrier signal and the vertical synchronizing frequency.

Abstract: A chrominance signal demodulation circuit capable of precisely processing a chrominance signal demodulation even when a phase of an inputted chrominance signal is abruptly changed due to a tape track skew error. A first and second color difference signals in an R-Y axis and B-Y axis directions are obtained by multiplying a color burst signal of the inputted chrominance signal and color subcarrier signals generated by a color subcarrier generator. A demodulation phase detector 17 generates a phase error signal to compensate a phase difference between the phases of the color burst signal and the color subcarrier signal based on the first and second color difference signals obtained. The color subcarrier generator 12 generates color subcarrier signals compensated responsive to the phase error signal. Thereby, a chrominance information portion following to the color burst signal in the inputted chrominance signal is successively processed with a chrominance signal demodulation with a correct phase.

Abstract: A color demodulation apparatus having color demodulation capabilities as the conventional ones, with its size reduced by sharing part of processing circuit therein is provided. An adder circuit 10 and a SW circuit 11 shift the phase of a ramp wave generated by a VCO circuit 9 alternately 90 degrees and 180 degrees for each clock. A SIN data generator circuit 12 generates a phase alternate SIN wave signal from the shifted ramp wave. A multiplier circuit 3 performs R-Y and B-Y demodulation through multiplexing based on the phase alternate SIN wave signal. An accumulator circuit 6 accumulates burst signals of each of R-Y and B-Y signals of the demodulated, multiplexed signal. A second load hold circuit 8 separately outputs an R-Y burst signal to the VCO circuit 9, and a B-Y burst signal to a comparator circuit 13, constituting two feedback loops. A first load hold circuit 5 separates R-Y and B-Y signals from the multiplexed signal, and outputs these two signals.

Abstract: A method and system are provided for controlling tint of component video signals. The system includes a first input for receiving a first component video signal; a second input for receiving a second component video signal; circuitry including a first differential amplifier and a second differential amplifier for receiving the first and second component video signals from the first and second inputs, respectively; a first output connected to the circuitry for outputting a first tint control adjustment signal for the first component video signal; and a second output connected to the circuitry for outputting a second tint control adjustment signal for the second component video signal.

Abstract: A color signal reproducing circuit having A/D converter 101, sync separator 102, YC separator 103, gain controller 105, multipliers 106 and 107, low-pass filters 108 and 109, burst-period cumulative adders 110 and 111, SINCOS generator 112, clock generator 113, and ramp-wave generator 114. The simple structure allows a color signal reproducing circuit to be used commonly in a different television systems without changing its clock frequency considerably in accordance with broadcasting systems and also achieves YC separation and color signal demodulation from analog composite signal with a higher degree of precision.