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| Number | Title | Issue Date |
| 7352406 | Signal acquisition following transient signal interruption A television monitor display with video signal processing comprises a source (SM) of a video display signal (Y) including a sync component (S). A video processor (U1) is coupled to process the video display signal (Y). A sync separator (SS) is coupled to gene... | 04/01/2008 |
| 7110042 | Synchronization signal decoder and associated method The invention relates to a synchronization signal decoder and associated method for improving digital image display. A composite video stream includes a distortion compliant signal and a synchronization signal. A level shift circuit is adapted to shift a voltage lev... | 09/19/2006 |
| 7092461 | Polyphase receivers A polyphase receiver comprises an RF front end (10 to 28) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image rejection filter formed by a polyphase filter (30) for filte... | 08/15/2006 |
| 7046301 | Vertical synchronous signal detection circuit A vertical synchronous signal detection circuit includes an analog-digital converter, an average calculation circuit and a compare circuit. The analog-digital converter receives a composite video signal and converts the video signal into a digital signal having a ve... | 05/16/2006 |
| 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 |
| 6940561 | Automatic modulation and RF carrier level control of sync suppressed television signals The depth of modulation and the absolute RF carrier level of an amplitude-modulated video signal are automatically adjusted. For adjustment of the depth of modulation, a sync tip of the video signal is sampled, corrected and normalized to a reference level, e.g., a ... | 09/06/2005 |
| 6441847 | Method for determining the quality of a video and/or television image signal The invention concerns a method for determining the quality of a video and/or television image signal. In diversity reception installations comprising several receivers, it is necessary to establish a criterion for assessing the reception signals, so as t... | 08/27/2002 |
| 5841563 | Method and system for efficient optical transmission of NTSC video A technique for delivering analog video over fiber-to-the-home (FTTH) networks addresses a fundamental problem of the standard signal format, i.e., power budget constraint, by increasing the usable optical signal efficiency. In particular, a technique is ... | 11/24/1998 |
| 5754251 | Digital video vertical synchronization pulse detector A digital video vertical synchronization pulse detector for detecting a vertical synchronization pulse in a video signal is disclosed. The digital video vertical synchronization pulse detector includes a threshold device for comparing a first digital data... | 05/19/1998 |
| 5659355 | CCD dark mean level correction circuit employing digital processing and analog subtraction requiring no advance knowledge of dark mean level A digital black clamp circuit for calibrating the black level of an image signal produced by an imaging device, such as a CCD sensor. The digital black clamp circuit comprises a source of a video signal having a first interval of black level pixels and a ... | 08/19/1997 |
| 5272531 | Automatic gain control system for use in positive modulation which detects the peak white voltage level slowly while simultaneously adjusting black voltage level fluctuations quickly An AGC system for use in positive modulation schemes of video signals is provided. The AGC system utilizes an IF amplifier, a demodulator, a video amplifier, a gated amplifier and a peak detector. The gated amplifier has a first, relatively fast, time con... | 12/21/1993 |
| 5185657 | Color signal processing circuit with residual phase error correction A color signal processing circuit which includes a conversion unit for converting two color difference signals, which are equivalent to color difference signals obtained by color demodulation of a color signal by using two color difference axes intersecti... | 02/09/1993 |
| 4667232 | Synchronizing pulse restoration circuit A decoder for a television signal encrypted with randomly inverted video and randomly suppressed sync pulses includes inverting and noninverting amplifiers for inverting the inverted video and a sync pulse restoration circuit for restoring suppressed sync... | 05/19/1987 |
| 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 |
| 4410876 | D.C. Stabilized analog-to-digital converter A D.C. stabilized analog-to-digital converter of the type having a coarse converter responsive to a supplied analog signal for converting the analog signal to a coarse digital signal representation thereof, a reconverter for reconverting the coarse digita... | 10/18/1983 |
| 4228460 | Method and apparatus for compensation of time base errors Method and apparatus for compensating for variations in the time base of a video signal reproduced in a longitudinal video tape recording system. The signal is passed through a charge-coupled device clocked by a variable rate clock signal to correct for t... | 10/14/1980 |
| 4155049 | Automatic frequency control circuit for television horizontal oscillator An automatic frequency control circuit comprising two switching transistors with the emitter-collector paths thereof connected in series with each other between a power source and a reference voltage source, a horizontal synchronizing signal being commonl... | 05/15/1979 |
| 4012643 | Noise elimination circuit A noise elimination circuit utilizing a novel four-terminal semiconductor device having an emitter-grounded current amplification factor which rises steeply from a low point to a constant level portion. The input signal which contains desirable signal por... | 03/15/1977 |
