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| Number | Title | Issue Date |
| 7349033 | Systems and methods for correcting color phase error in video systems Systems and methods are provided for correcting color phase error in a video decoder system. A demodulator system demodulates the composite input signal and the at least one delayed signal to produce sets of baseband chroma components based on a phase correction val... | 03/25/2008 |
| 7277134 | Chrominance signal demodulation apparatus 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 a... | 10/02/2007 |
| 7227585 | Luminance and chrominance separation system 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 refere... | 06/05/2007 |
| 7167213 | Comb filter design for separating luminance and chrominance in video signals Provided are decoding methods and decoders for calculating comb filter error and performing comb filter calculation used for decoding video signals. In one aspect, a method of calculating comb filter error used for decoding a video signal comprises storing a plurali... | 01/23/2007 |
| 7151574 | Optimized structure for digital separation of composite video signals A device and method are provided for implementing digital baseband separation of composite video signals with reduced memory requirements. The method and device require that only the composite signal be stored in a large delay element. Multiple quadrature demodulato... | 12/19/2006 |
| 7139037 | Circle correction in digital low-pass filter A filter circuit is provided which has a filtered input and an unfiltered input. The filtered input passes through delay elements to coefficient circuitry. The unfiltered input passes to the coefficient circuitry without passing through the delay elements. In this m... | 11/21/2006 |
| 6956622 | Method and apparatus for modulating video signals A luminance component of a video signal is modulated in a first frequency band. A chrominance component of the video signal is modulated in a second frequency band. The modulated luminance component and the modulated chrominance component are then transmitted across... | 10/18/2005 |
| 6947060 | Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance... | 09/20/2005 |
| 6943847 | FM demodulator for SECAM decoder 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 denominato... | 09/13/2005 |
| 6888579 | Method and system for tint control for component video signals 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 a... | 05/03/2005 |
| 6215528 | Method and apparatus for digital multi-standard color signal demodulation The key component of a digital PAL or NTSC color decoder is a quadrature demodulator for these AM modulated signals. For a SECAM color decoder, however, an FM demodulation is required which is conventionally implemented using a Hilbert filter which is fol... | 04/10/2001 |
| 6172713 | Color television system determination circuit A color system determination circuit for use with an input video signal having a frequency component is disclosed. The circuit includes a color trap filter for attenuating the frequency component in the input video signal with the color trap filter provid... | 01/09/2001 |
| 5731845 | Method and apparatus for correcting contour of color image signal A two-dimensional contour enhancement is performed along a plurality of lines on a two-dimensional frequency characteristic chart, the line intersecting with each other at middle points between successive color cross generating regions and not passing thr... | 03/24/1998 |
| 5654768 | Pal-system adaptive color-signal demodulator A PAL system demodulator capable of delivering high quality color signals even in the cases of poor vertical correlation comprising 1H delay line 1 delaying the chroma signal by one horizontal period, 1H delay-line 2 delaying a reference signal by one hor... | 08/05/1997 |
| 5512960 | Adaptive type color demodulation apparatus for PAL system An adaptive type color demodulation apparatus for the PAL system includes a first color demodulating circuit (PAL-D) for demodulating a PAL system chrominance signal between scanning lines and a second color demodulating circuit (PAL-S) for demodulating t... | 04/30/1996 |
| 5473388 | PAL chroma signal demodulating apparatus A signal demodulator apparatus comprises: an input terminal (11) for inputting an external signal; a delay line (12) connected to the input terminal, for outputting a first delay signal obtained by delaying the external signal by a predetermined time; a p... | 12/05/1995 |
| 5406335 | Pal encoder using a digital signal processing A PAL encoder comprises phase converter, first and second low-pass filters, a burst signal adder, a chrominance subcarrier generator, and a modulator. The phase converter converts digital first and second color-difference signals into digital U-axis and V... | 04/11/1995 |
| 5379077 | System for and method of, operating upon NTSC and PAL signals A system converts PAL and NTSC pixel clock signals to signals (in a studio, digital or square pixel format) at a sub-carrier frequency individual to the PAL and NTSC formats. The system includes a first register for providing a particular increase in the ... | 01/03/1995 |
| 5345311 | Pal system chrominance signal processing circuit with improved s/n In a PAL system chrominance signal processing circuit, a color burst signal is delayed by one horizontal period, a signal representing the difference between a non-delayed burst signal and the color burst signal delayed by one horizontal period is determi... | 09/06/1994 |
| 5006932 | Apparatus for processing a video signal A composite video signal each line of which comprises a line synchronizing pulse, a front and a back porch and a vision portion, the synchronizing pulse of which may contain a burst of pulsed additional information is applied to an input terminal (1) whic... | 04/09/1991 |
| 4933749 | Color television standard identification circuit A PAL-NTSC color television standard identification circuit, comprising a first demodulation circuit (7) for a reference component and a second demodulation circuit (11) for a possible color identification component of a color synchronizing signal, can pe... | 06/12/1990 |
| 4706110 | Apparatus for decoding a PAL standard color television signal The synchronously demodulated chrominance signals (C1d, C2d) each alternately represent, line by line, the sum and difference of the color difference signals U and V. They are supplied to a multiplexer (21) switched by a meander wave... | 11/10/1987 |
| 4695877 | Video signal processing apparatus for compensating for time differences between luminance and chrominance signals of a PAL system A video signal processing apparatus for use in a video tape recorder of the PAL system obtains a composite video signal without causing a vertical color shift on a display screen which would normally be caused by a time difference between a chrominance si... | 09/22/1987 |
| 4663654 | Blanking signal generator for a subcarrier locked digital PAL signal Non-orthogonality of the blanking region information caused by the 25 Hz offset in a digital PAL-encoded color television signal is corrected by a dynamic offset circuit. To this end, a plurality of waveforms describing the envelopes of the blanking, sync... | 05/05/1987 |
| 4661844 | Integrated circuit for the color decoder of a television set An integrated circuit is provided for the color decoder of a television receiver set and in particular for a multistandard decoder for NTSC, PAL and SECAM. Conventionally employed external components used for synchronizing and amplitude calibration are re... | 04/28/1987 |
| 4644388 | Process and circuit for the demodulation of chrominance signals The present invention relates to chrominance decoding circuits and more particularly to a novel circuit for demodulating chrominance signals, B-Y or R-Y. This circuit comprises, connected in series, a multiplier multiplying the U or V-modulated chrominanc... | 02/17/1987 |
| 4644389 | Digital television signal processing circuit An analog video signal of a PAL system is converted into a digital video signal by an A/D converter. The digital video signal is supplied to a delay device so as to be subjected to hue correction and Y/C separation. The delay device generates a plurality ... | 02/17/1987 |
| 4641180 | Electronic circuit apparatus for separating the luminance and color information of a color television signal A single television signal delay chain is interconnected with linear combination matrices for frame comb filtering and line comb filtering. Related circuits provide correction signals for controllably eliminating the frame or the line comb filtering. Dete... | 02/03/1987 |
| 4638349 | Method of and circuit for digitally demodulating an amplitude-modulated signal produced by suppressed-carrier amplitude modulation of two carriers of the same frequencies in a phase-quadrature relationship The invention relates to a method of and a circuit for digitally demodulating a suppressed-carrier amplitude-modulated signal, of two carriers having the same frequencies Fs in a phase-quadrature relationship, and having a sinusoidal reference signal whic... | 01/20/1987 |
| 4605953 | Digital PAL color television signal demodulators A digital PAL color television signal demodulator for demodulating the U and V color component signals from an input chrominance signal derived from a PAL color television signal which has been digitized by being sampled a predetermined number of times pe... | 08/12/1986 |
| 4589013 | Automated encoded signal color image compositing A method and apparatus to cause a colored backing to be replaced by a background scene, such that the composite scene shows no loss of detail, no edge anomalies, no evidence of a colored backing having been present, and no evidence that the final scene is... | 05/13/1986 |
| 4553156 | Circuit and process for chrominance decoding with analog or digital delay line in a television system of a pal or secam type The present invention provides a matching circuit for connecting a chrominance decoding integrated circuit normally connected by terminals to a conventional analog delay line so as to make it compatible with a digital delay line. This matching circuit com... | 11/12/1985 |
| 4546377 | Circuit arrangement for processing color television signals A circuit arrangement for processing color television signals incorporated in a multi-mode type color TV receiver which is capable of receiving TV signals processed by different television systems such as NTSC and PAL systems. The circuit arrangement for ... | 10/08/1985 |
| 4491801 | Matrix circuit for processing plural signals Unbalanced two input signals are applied to a buffer. The buffer provides to an balanced adder with balanced buffer output signals. The adder adds the buffer output signals and generates an unbalanced addition output signal. The addition output signal is ... | 01/01/1985 |
| 4460925 | Method and apparatus for deriving a PAL color television signal corresponding to any desired field in an 8-field PAL sequence from one stored field or picture of a PAL signal A single field or picture of a PAL color television signal is stored in a store and provides a signal at an input (52). The stored signal consists of 2fsc samples taken at 45° to the U-axis. The signal is separated by a filter (56) and subtrac... | 07/17/1984 |
| 4419688 | Color-television receiver with at least one digital integrated circuit for processing the composite color signal The color television receiver includes a square-wave clock generator used as a chrominance subcarrier oscillator generating at least four clock signals, the first of which has a frequency four times the chrominance subcarrier frequency, and the second to ... | 12/06/1983 |
| 4417271 | Demodulator circuit for color television signals of PAL system A demodulator circuit of PAL type color television signals which is arranged so as to demodulate the correct polarity R-Y signal without controlling the fH /2 line switching pulse in phase.... | 11/22/1983 |
| 4412181 | Process for the demodulation of an amplitude modulated signal and demodulator performing this process A process for the demodulation of an amplitude modulated signal composed of two suppressed carriers, at a same frequency F and in phase quadrature, which are respectively modulated by two modulation signals, the modulated signal being preceded by a refere... | 10/25/1983 |
| 4409612 | Circuit arrangement for separating the components of a PAL color television signal Circuit arrangement for separating the components of a PAL color television signal, in which the (digitized) u- and v-signals of the subcarrier frequency are passed through two delay lines which produce different time delays (for example 283.5 and 284 chr... | 10/11/1983 |
| 4408222 | Phase detector for television tuning systems and the like A phase detector suitable for use in an identification circuitry of a PAL/SECAM Television Receiver or the like for identifying the line sequence, wherein the input of the phase detector is adapted to receive the differential output signals from a frequen... | 10/04/1983 |
