Class 348/508 - Digital

Subclass of Class 348 - Television
Definition: Subject matter wherein the demodulator is implemented using
No. of patents: 37
Last issue date: 04/29/2008

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Number	Title	Issue Date
7365796	System and method for video signal decoding using digital signal processing A digital signal processing based decoder is disclosed. The decoder asynchronously samples video signals. By doing so, the decoder can work in pseudo real-time and without analog interface components improving performance while reducing cost. ...	04/29/2008
7349009	Vector waveform correction device A phase shifter (70) for correcting the phase of a sub-carrier signal input into a decoder to a burst signal has a phase shift setting (5), a correction amount setting (9′), a phase shifter (6) and a 90-degree phase shifter (7). ...	03/25/2008
7330217	Chroma phase error correction circuitry and methods and systems utilizing the same Chrominance phase error correction circuitry includes a demodulator for demodulating a received video color burst signal into first and second demodulated signals and signal generation circuitry for providing to the demodulator a demodulating signal for demodulating...	02/12/2008
7321397	Composite color frame identifier system and method A color frame identifier circuit generates a pseudo-subcarrier signal and compares the pseudo-subcarrier signal to a sliced color burst of at least one selected line in a video frame. Based on this comparison, a processing circuit determines the color frame. ...	01/22/2008
7202893	Method and apparatus for the display of still images from image files An apparatus for displaying digital image files on a standard display device such as a television set is provided in the form of a set-top box. The box includes an integrated circuit and memory buffer for computing an image from a file, a second memory buffer for st...	04/10/2007
7050097	Method and apparatus for the display of still images from image files An apparatus for displaying digital image files on a standard display device such as a television set is provided in the form of a set-top box. The box includes an integrated circuit and memory buffer for computing an image from a file, a second memory buffer for st...	05/23/2006
6965272	Worldwide marketing logistics network including strategically located centers for frequency programming crystal oscillators to customer specification A worldwide logistics network includes a processing center for receiving customer orders for crystal oscillators over communications links, processing the orders, and generating work orders that are selectively disseminated over communications links to programming c...	11/15/2005
6954113	Programmable oscillator circuit A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. ...	10/11/2005
6952239	Sine generation circuit, phase shift circuit and tint adjustment circuit A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin θ) of the phase shift input signal (θ) and a reversed sine-converted output signal (−sin θ) of the phase shift input signal (θ), a cosine generation c...	10/04/2005
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
6839092	Feed forward error correction in video decoder In accordance with an embodiment of the present invention a microprocessor in the horizontal phased lock loop reads the horizontal timing with respect to the sync input and provides an increment inch to the horizontal discrete time oscillator to make corr...	01/04/2005
6760076	System and method of synchronization recovery in the presence of pilot carrier phase rotation for an ATSC-HDTV receiver There is disclosed a system and method for recovering a recurring data segment synchronization pattern in the presence of an arbitrary phase rotation of a pilot carrier by detecting and compensating for the amount of the phase rotation. The system comprises a first ...	07/06/2004
6741289	Technique to stabilize the chrominance subcarrier generation in a line-locked digital video system A technique to stabilize subcarrier generation in a line-locked digital video system, caused by simultaneous locking of the genlock device causing continuous changing of a shared clock signal, by calculating a time shift occurring in an output waveform, converting t...	05/25/2004
6654065	Apparatus for generating timing and synchronizing signals for a digital display device A standard signal processing apparatus for a digital display that is adaptive for a digital display device. In the apparatus, a synchronizing signal/image signal separator separates an input signal into a composite synchronizing signal and image signals. ...	11/25/2003
6538702	Digital color signal reproducing circuit 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 generato...	03/25/2003
6330034	Color phase-locked loop for video decoder A microprocessor controlled color phase locked loop is provided which provides flexibility and adaptability for different television standards and sampling rates. Color burst phase error and color burst amplitude information are stored in data registers l...	12/11/2001
6292224	Method for eliminating dot-crawl on NTSC television monitors An improved method for generating an NTSC compatible color television video signal having a main carrier signal and a color subcarrier signal 3,579,545 Hz above the main carrier signal. The main carrier signal is modulated by a luminance signal, while the...	09/18/2001
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
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
6034735	Clock generator for digital video signal processing apparatus A clock generation circuit for a digital video processing apparatus which has a simple structure and can be stably worked in both luminance and color signal systems. A color burst phase error signal indicative of phase difference of a color burst signal i...	03/07/2000
5995168	Digital video receiver A video receiver includes a tuner, a QAM demodulator including a selective gated PLL carrier recovery circuit, and a digital equalizer. The selective gated PLL carrier recovery circuit has a normal operation mode and a selection control mode. The channel ...	11/30/1999
5940137	Symbol timing generation and recovery for data transmission in an analog video signal A video transmission system and method including a technique for deriving clock information in a receiver from a transmitted analog video signal to decipher digital data encoded on the video signal. A phase-locked loop in the transmitter is used to phase-...	08/17/1999
5786865	Apparatus and method for digital amplitude and phase detection A digital amplitude and phase detector for detecting the amplitude and phase of a color burst digital signal used in television systems is provided. The detector comprises a phase lock loop circuit for detecting the phase of said color burst signal and fo...	07/28/1998
5719512	Digital oscillating circuit for multiple systems-ready television receivers An oscillator includes a frequency-controllable clock generator, and a digital oscillator responsive to a clock generated by the clock generator for oscillating a data sequence at a period in proportion to the clock and also discretely controllable in acc...	02/17/1998
5459524	Phase modulation demodulator apparatus and method This invention is for a reference generator and demodulator for recovering information which has been phase, modulated on (or encoded on) a carrier. The inventive concepts described herein include a novel reference measurement circuit including a sampler ...	10/17/1995
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
4736237	Chroma demodulation apparatus for use with skew corrected clock signal An apparatus is disclosed for generating a burst-locked, color subcarrier representative signal $c;sc from a skew-corrected clock signal MCS (which is reset once every horizontal line) and a skew error signal SES (indicative of the once-a-li...	04/05/1988
4694327	Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the...	09/15/1987
4694326	Digital phase locked loop stabilization circuitry including a secondary digital phase locked loop which may be locked at an indeterminate frequency A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signals components of a composite video signal. A second digital phase locked loop is clocked by th...	09/15/1987
4686560	Phase locked loop system including analog and digital components A digital television receiver, having a line-locked clock, includes a partly digital, partly analog phase locked loop. This phase locked loop regenerates two quadrature phase related subcarrier signals that are used to synchronously demodulate the chromin...	08/11/1987
4677463	Color television receiver comprising a chrominance signal processing circuit and an integrated circuit therefor By including a counting circuit, optionally followed by a sample-and-hold circuit coupled to an output of a quadrature-component demodulator in a chrominance signal processing section of a color television receiver and providing a memory circuit for a pre...	06/30/1987
4612568	Burst-to-line-locked clock digital video signal sample rate conversion apparatus A digital video signal processing system is described wherein analog video signal is sampled by a sampling clock phase locked to burst and the digital video samples are processed with a clock phase locked to horizontal sync. The respective sampling phases...	09/16/1986
4598310	Circuit arrangement for obtaining a phase-sensitive control quantity, in particular in a color television receiver A circuit arrangement for obtaining a control quantity which is dependent on the phase shift of a color burst signal comprising an amplitude factor with respect to a reference signal, preferably of approximately the same frequency, which is phase-locked t...	07/01/1986
4585998	Method and device for coherent demodulation of a digitally modulated carrier A digitally modulated carrier modulated by phase shift keying or frequency shift keying with phase continuity, transmitted as useful bursts distributed at equal time intervals with phase continuity from each burst to the next burst. The carrier frequency ...	04/29/1986
4491862	Color-television receiver with at least one digital integrated circuit for processing the composite color signal To digitally synchronize the chrominance-subcarrier oscillator in the form of a phase-locked loop with the color burst contained in the composite color signal, suitable digital subcircuits are provided. During the keying pulse, the digital R-Y and B-Y col...	01/01/1985
4485396	Automatic chroma filter An auto chroma filter averages the value of successive color burst amplitudes on a line-by-line basis over many video frames, by fetching a burst value from memory and loading it into an up/down counter, and also into a D/A converter which provides the ch...	11/27/1984
4395729	Digital video signal processing filters with signal-to-noise enhancement A digital output tapped filter is provided in which the filtered output signals are latched into a first latch circuit by the clock signal which clocks the serial shift register. Output signals are thereby held in the register during the time that new dat...	07/26/1983

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Class 348/508 - Digital