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| Number | Title | Issue Date |
| 7355655 | Systems and methods for separating luma and chroma information in a composite video signal 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 c... | 04/08/2008 |
| 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 |
| 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 |
| 7142254 | Self compensating video data amplifier and driver for broadcast data receiver The invention relates to improvements to the operation of a broadcast data receiver (BDR) and, in particular, to the provision of a video data amplifier and driver circuit for the processing of a received video data signal. The circuit includes a means for generatin... | 11/28/2006 |
| 7098967 | Receiving apparatus Frequency conversion into a first intermediate frequency which is higher than a received frequency band is performed for a received signal by using a mixer and a PLL. Next, an output of the mixer is frequency converted into a second intermediate frequency of a base ... | 08/29/2006 |
| RE39214 | Blending text and graphics for display Text and graphics elements may be alpha blended in a way to reduce flicker when the text or graphics are display by a processor-based television receiver. The alpha values are used to intelligently smooth pixels adjacent the element to create television text and gra... | 08/01/2006 |
| 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 |
| 6559899 | Digital blocks television tuner having simple baseband signal processing portion A digital television tuner is realized in which the construction of a baseband signal processing portion is simple, it is difficult for a local oscillation signal to leak to the input end side, and in which image interference is suppressed. The digital te... | 05/06/2003 |
| 6356145 | Demodulator circuit which demodulates a signal without any restriction from a clock signal A demodulator circuit including: a signal generating circuit for generating a sine-wave signal and a cosine-wave signal whose frequencies are same as that of the carrier wave of a modulated signal, a multiplying circuit for multiplying the modulated signa... | 03/12/2002 |
| 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 |
| 6124898 | Digital television receiver with equalization performed on digital intermediate-frequency signals A digital television signal receiver in a television set or in a digital video recorder digitizes received digital television signal as converted in frequency to a final intermediate-frequency band close to baseband, then performs equalization filtering o... | 09/26/2000 |
| 6094235 | Digital television broadcast receiver that demodulates an intermediate frequency signal having a frequency higher than a frequency of a received signal A digital television broadcast receiver comprising a digital signal demodulator, wherein the frequency of an intermediate frequency signal is made higher than the maximum frequency of any received signal, the intermediate frequency signal being demodulate... | 07/25/2000 |
| 6064446 | Color decoding In a method of demodulating an analog chrominance signal (C), digital quadrature signals are generated (DPA, SIN ROM, COS ROM) for demodulating (MUL DAC U, MUL DAC V) the analog chrominance signal (C) to obtain analog demodulated color difference signals ... | 05/16/2000 |
| 5926220 | Composite digital video decoder and digital compressor In accordance with an illustrative embodiment of the invention, a composite video signal is decoded as follows. A filtered and optionally re-sampled luminance component is obtained by vertical low-pass filtering the composite video signal using a vertical... | 07/20/1999 |
| 5654767 | Digital chrominance signal demodulating device In a digital chrominance signal demodulating device receiving a carrier chrominance signal obtained by digitizing an analog composite video signal, a frequency component near the horizontal frequency of the color subcarrier is extracted, and color-differe... | 08/05/1997 |
| 5640205 | Video camera apparatus and a camera control unit for controlling the video camera apparatus In a camera section, a luminance signal and the predetermined hue gate signal are modulated by a modulator in a quadrature modulation manner and the modulated signal is transmitted to a camera control unit via a cable. The modulated signal is separated by... | 06/17/1997 |
| 5627588 | Video signal processing stripe color demodulator system and method An image is captured into a video signal by an array sensor with color stripes. The system first interprets the highest frequencies of the signal as an upper sideband of the I color component so as to double the recoverable bandwidth of color detail. From... | 05/06/1997 |
| 5574513 | Color selection aperture correction circuit A video signal processor controls aperture correction of the video signal by detecting the occurrence of particular colors in the image produced by the video signal. The particular color, for example, fleshtone, is detected as a ratio of the amplitude of ... | 11/12/1996 |
| 5526060 | Luma/chroma decoder with demodulated control signal A decoder that provides simultaneous horizontal scanning lines for digital color video, and then band splits each line into high and low frequency signals using low pass filters and subtractors to subtract the low frequency signals from the source video. ... | 06/11/1996 |
| 5500739 | Frequency-multiplexing FM luma signal with color and 2nd under signals having overlapping frequency spectra A frequency-multiplexed video signal is generated in which a color-under signal and a second under signal are linearly combined with at least partially overlapping frequency spectra to form a composite under signal for an FM luma signal. The frequency-mul... | 03/19/1996 |
| 5495203 | Efficient QAM equalizer/demodulator with non-integer sampling A QAM demodulator that samples an IF input modulated with data at a fractional complex sampling rate between one and two times the data rate. The use of a fractional sampling rate significantly reduces the number of components necessary to implement the d... | 02/27/1996 |
| 5477199 | Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus A synchronous detector for demodulating and decoding a digital data signal modulated either according to a vestigial sideband or a quadrature amplitude modulation scheme is based upon the principle of recognizing that a vestigial sideband signal may be re... | 12/19/1995 |
| 5396294 | Digital chrominance signal demodulation apparatus Different from typical signal processing which employs a feedback control, by adopting a demodulating circuit employing AFC, which is not affected by a comb filter, the response characteristic against jitter is improved and a down converted chrominance si... | 03/07/1995 |
| 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 |
| 5359368 | Demodulating a line locked digital color television signal A line locked digital color demodulator separates the V and U color components and the burst signal and uses a ROM for providing phase shifts to the V and U demodulation axes. During the burst time of an NTSC signal, the color component axes are shifted b... | 10/25/1994 |
| 5155584 | Image recording reproducing apparatus switching image sensor signals or reproduced signals to an A/D converter An apparatus for recording/reproducing an image, includes a unit for switching between an image signal read from an image sensor in units of pixels and a reproduction signal from a recording medium, an A/D converter for converting the image signal from th... | 10/13/1992 |
| 5132785 | Data selector for demodulating chrominance signal A data selector capable of digitally separating I signal components from Q signal components of carrier chrominance signal in a NTSC system. The data selector of the present invention, using the fact that I and Q components of a carrier chrominance signal... | 07/21/1992 |
| 5097321 | Three dimensional adaptive decoding system and method A decoding system (10) receives a composite digital NTSC D2 input signal or a composite analog NTSC RS-170A input signal. The decoding system (10) decodes and sample rate converts to a component digital D1 output and a component analog RGB or Y(R-Y) (B-Y)... | 03/17/1992 |
| 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 |
| 4857990 | Digital video storage A simple, efficient technique for encoding NTSC video signals features sampling the signal at 8/3 the subcarrier frequency, generating no more than 256K samples for a full 525 line frame, generating as many samples per horizontal scan line as there are co... | 08/15/1989 |
| 4692889 | Circuitry for calculating magnitude of vector sum from its orthogonal components in digital television receiver An arrangement is provided for computing the magnitude value of the vector sum of two quadrature-related component signals I and Q with a minimal of hardware. To this end, the magnitude values of the orthogonal I and Q signals are applied to a ROM as addr... | 09/08/1987 |
| 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 |
| 4633187 | AM synchronous detecting circuit A demodulating circuit for an amplitude-modulated signal comprises an input terminal to be supplied with an input signal comprising at least a modulated carrier signal amplitude-modulated by an information signal, the modulated carrier signal having a pre... | 12/30/1986 |
| 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 |
| 4468689 | Color separation circuit A color separation circuit includes a comb filter for generating output signals corresponding to the sum of and difference between a composite input video signal and a signal prepared by delaying the composite input video signal by one horizontal scanning... | 08/28/1984 |
