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| Number | Title | Issue Date |
| 7432918 | Video signal processing circuit The video signal processing circuit has a clamp circuit for clamping a composite video signal including a copy guard signal with amplitude of from white to black as well as a pseudo horizontal synchronization signal, a brilliant signal, and a synchronization signal.... | 10/07/2008 |
| 7365798 | Video signal identification device and video signal identification method The procedure of the invention acquires a maximum RB value, which is a largest value of an R signal component and a B signal component, on the assumption that the signal format of an input video signal is an RGB signal, and obtains an RGB probability corresponding t... | 04/29/2008 |
| 7358995 | Captured-image-signal processing method and apparatus and imaging apparatus An imaging apparatus includes a solid-state imaging device that outputs a captured image signal in current mode, which in turn is subjected to CDS processing in current mode by a current signal detector, thus suppressing FPN noise. A captured image signal output by ... | 04/15/2008 |
| 7345714 | Video signal clamp A circuit and method for clamping a composite video component signal at the video black level by using horizontal synchronization timing information contained within the signal and clamping the signal during a time interval in which it is at the desired black level.... | 03/18/2008 |
| 7236203 | Video circuitry for controlling signal gain and reference black level An apparatus and method for controlling signal gain and reference black level of a video signal. Magnitudes of signal gain and reference voltage for a subject video signal are determined by a common digital control signal, while the reference voltage determines the ... | 06/26/2007 |
| 7126645 | Back-porch clamp The invention teaches a method, means and apparatus for clamping a back porch interval of a video signal including clamping a sync-tip level of said video signal to a variable reference voltage, comparing a back-porch voltage level of the sync-tip clamped video sign... | 10/24/2006 |
| 7106231 | Video signal processing system including analog to digital converter and related method for calibrating analog to digital converter A video signal processing system capable of adjusting errors and related methods are introduced. The video signal processing system and related calibration methods utilize the characteristic of periodic breaks of video signals to perform various kinds of calibration... | 09/12/2006 |
| 6970203 | Automatic cut-off system The automatic cut-off system includes a video data processing circuit, a cut-off control circuit, a drive circuit, and a level control section. The video data processing circuit adds a cut-off reference pulse having a predetermined level to primary-color signals of ... | 11/29/2005 |
| 6967691 | Color difference signal processing A color video display signal processor comprises a source of a color difference signal and an analog to digital converter for converting the color difference signal to a digital signal. A potential divider is coupled to reference voltages of the analog to digital co... | 11/22/2005 |
| 6956621 | High impedance digital full line video clamp A circuit for clamping a TV signal includes an input capacitor coupled to the TV signal, an analog-to-digital converter that outputs a digital signal corresponding to TV signal, a comparator that compares the digital signal to a black level signal, and a high impeda... | 10/18/2005 |
| 6930728 | Scan conversion apparatus An apparatus and a method for converting image signals from an interlaced scanning format to a progressive scanning format are disclosed. Additionally, an apparatus and a method for changing a vertical scanning rate of progressively scanned image signals are also di... | 08/16/2005 |
| 6897901 | Circuit for combining AKB and selective beam current limiting and projection television system utilizing same A control circuit for use in a video processor utilizes combined automatic kinescope bias (AKB) control, and average individual beam current sensing and limiting in at least one CRT. The control circuit includes automatic kinescope bias (AKB) control circuitry for d... | 05/24/2005 |
| 6888575 | Digital cut-off control loop for TV using speeding and blanking circuits An improved digital cut-off control loop for black level adjustment in a video processor for controlling RGB output signals. The improved circuit advantageously provides a higher resolution of the black level adjustment, and a short cut-off convergence time when the... | 05/03/2005 |
| 6888889 | Image information conversion apparatus and image information conversion method The system provides an image information conversion apparatus and method by which picture quality deterioration caused by conversion from inputted MPEG2 image compression information into MPEG4 image compression information to be outputted is prevented. When an I pi... | 05/03/2005 |
| 6762800 | Circuit for controlling luminance signal amplitude The circuit takes into account whether the image on a screen is too bright, whether more than one specific number of pixels have a luminance value that is greater than a given peak value and whether this condition is met in more than one specific number of lines in ... | 07/13/2004 |
| 6618096 | System and method for adaptively balancing quadrature modulators for vestigial-sideband generation A digital signal processing vestigial-sideband television modulator receives a television signal. The present invention digitizes the television signal to generate a video signal and a digital processor processes the video signal to generate a complex bas... | 09/09/2003 |
| 6529248 | Method and apparatus for improved signal restoration A method and/or apparatus is capable of performing high accuracy digital level restoration with a high degree of noise immunity provided by a passive clamping stage.... | 03/04/2003 |
| 6441871 | Method for correcting amplitude of synchronizing signal of composite video signal and device therefor A method and device are provided for correcting an amplitude of a synchronizing signal. A pedestal voltage, Vped, (i.e., a reference level) may be detected which repetitively occurs at the same period as a synchronizing signal of an input composite video ... | 08/27/2002 |
| 6339435 | Device to automatically adjust video signals to a blanking level and method therefor A device to automatically adjust video signals to a blanking level to realize a precise intended color by being fed back with video signals at the blanking level stored in an ASIC (application-specific integrated circuit), which stores video signals at a ... | 01/15/2002 |
| 6226037 | AKB interface circuit for kine driver IC An AKB interface apparatus in a display system (10), includes a video signal processing IC (12) having outputs coupled via respective kinescope driver ICs (18,20,22) to respective kinescope cathodes (K1,K2,K3) for display of a color image, the signal proc... | 05/01/2001 |
| 6204892 | Circuit for clamping pedestal signal A clamping circuit with a low-pass filter inserted in a feedback loop from an output terminal of a comparator to variable current sources for obtaining a feedback signal having only a DC component or having only a substantial portion of a DC component obt... | 03/20/2001 |
| 6141064 | Luminance signal generation circuit with single clamp in closed loop configuration A luminance signal generation circuit with single clamp generates a separate luminance signal Y by combining RGB input signals in a weighted manner within a Y-Matrix circuit. During a burst period the single clamping circuit is enabled. When enabled, the ... | 10/31/2000 |
| 6049355 | Apparatus and method for clamping an image signal A clamping circuit for use in a video camera varies a level of an image signal utilizing an analog feedback control signal, converts the varied image signal to a digital image signal, generates a digital zone value signal that corresponds to a level of a ... | 04/11/2000 |
| 6008864 | Composite video signal backporch soft-clamp system using servo loop A backporch soft-clamp circuit using a servo loop clamps the blank or DC level of a composite video signal to a known value without altering the other components of the signal. The values of the components of the composite video signal are determined by d... | 12/28/1999 |
| 5894327 | Video display system with AKB responsive screen grid supply Video signals to be displayed are applied via a video driver amplifier to the cathode electrode of a kinescope. A beam current sensor, also coupled to the cathode electrode, provides a beam current indicating signal. An AKB regulator, responsive to the be... | 04/13/1999 |
| 5731771 | Circuit for locking a signal to a reference value The present invention relates to a circuit for locking an analog signal to a reference value, including an analog-to-digital converter receiving the analog signal modified by the charge stored in a capacitor. A digital comparator receives the output of th... | 03/24/1998 |
| 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 |
| 5532758 | Feedback clamp circuit for analog-to-digital conversion An image processing apparatus includes an analog image signal clamp and an A/D converter that converts the analog image signal into an m bit digital signal. The clamp is controlled in accordance with an n+1 (m>n) bit digital image signal converted by the ... | 07/02/1996 |
| 5510854 | Device for adjusting the black level of a video signal A device for adjusting a video signal so that its black level is in coincidence with a predetermined reference level includes a capacitor having a first terminal that receives the video signal and a second terminal that provides the adjusted video signal,... | 04/23/1996 |
| 5500688 | Synchronizing signal clamping circuit of image signal processing integrated circuit A synchronizing signal clamping circuit for an integrated image signal processing circuit has an input buffer circuit for receiving a composite image signal; a level clamping circuit for clamping a synchronizing signal tip level of the composite image sig... | 03/19/1996 |
| 5448308 | Apparatus for clamping a video signal level A video signal clamp involves evaluating the difference between the signal level and the desired clamp level during the back porch interval. A correction signal indicates whether the signal level must be increased or decreased to establish the desired cla... | 09/05/1995 |
| 5410365 | Video camera with coarse analog and fine digital black level adjustment In an image pick up device, signal level of red, green and blue color signals is coarsely adjusted in a signal processing circuit, and then a black level of video signal is finely adjusted in a digital signal processing circuit, thereby being capable of e... | 04/25/1995 |
| 5371552 | Clamping circuit with offset compensation for analog-to-digital converters A clamp circuit including a clamping capacitor and a differential amplifier charge and discharge the clamping capacitor in accordance with the magnitude of difference signals applied to the differential amplifier's inverting and non-inverting inputs. The ... | 12/06/1994 |
| 5321504 | Modified black-level regulation based on warm up detection of CRT A method for detecting the warm-up of a television CRT includes the following steps during a warm-up phase of the tube: providing the CRT with warm-up signals during predetermined line periods at the initial portion of frames; and detecting the cathode cu... | 06/14/1994 |
| 5057920 | Video signal clamping circuit operating in the digital domain for removing excess noise on the black level and for providing d c restoration In a video signal clamping circuit, a FIFO register stores a sequence of digital samples of an input video signal taken during a portion of a horizontal blanking interval of the signal during which the signal is at a black level. A black level error PROM ... | 10/15/1991 |
| 4970594 | Television video signal control system A television video signal control system is disclosed in which an amplitude control signal and a clamp voltage control signal digitally detected in the automatic gain control and clamp voltage control of a television signal receiver respectively are appli... | 11/13/1990 |
| 4742392 | Clamp circuit with feed back A clamp circuit comprising: a clamp circuit for clamping an input video signal to a predetermined clamp level in the interval corresponding to a first gate signal; a clamp level forming device for extracting a signal after it is clamped in the interval co... | 05/03/1988 |
| 4707730 | Sync extraction for a broadcasting system with time multiplexing of digital and analog signals In a broadcasting system with time division multiplexing of digital signals containing a synchronization pattern and analog signals, sync extraction is achieved with a process including detecting the extreme values of the signals to be subjected to decodi... | 11/17/1987 |
| 4707741 | Video signal clamping with clamp pulse width variation with noise A video signal clamping arrangement is provided for periodically clamping a predetermined nonpicture portion of a video signal, having picture portion and predetermined nonpicture portions, to a desired reference level with a clamp time duration varying a... | 11/17/1987 |
| 4701786 | Pedestal control circuit In a pedestal control circuit, a reference signal is superposed on a video signal before gamma correction. The reference signal component is detected from the gamma-corrected video signal. The level of the detected reference signal component is compared w... | 10/20/1987 |
