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| Number | Title | Issue Date |
| 8059205 | Image signal processing apparatus and image signal processing method for controlling optical black level of image signal An image signal processing apparatus includes a clamp circuit that clamps an image signal having a horizontal synchronization signal, an optical black level period representing an optical black level, and an effective signal period representing an image signal for o... | 11/15/2011 |
| 8045065 | SOG signal detection circuit A Sync On Green signal detection circuit includes a clamping circuit for clamping a voltage of a video graphics signal within a default range and then outputting a clamped input signal; a first PGA (programmable gain amplifier) for receiving and amplifying the clamp... | 10/25/2011 |
| 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 |
| 7423698 | Amplifier for amplifying input signal such as video signal and outputting amplified signal An amplifier which amplifies an input signal, wherein an amplified signal which varies with a ground voltage as a center is obtained at an output of the amplifier using a positive power supply and a negative power supply. With this configuration, an amplified signal... | 09/09/2008 |
| 7375572 | Clamping circuit A clamping circuit for restoring the DC level of video input signals. The clamping circuit comprises a coupling capacitor, a latch, a logic element, a charge switch, and a constant current source. The latch is coupled to the coupling capacitor to receive a video inp... | 05/20/2008 |
| 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 |
| 7355640 | Image capturing device An image capturing device having a function of clamping an image signal. When the image capturing device is activated, a synchronous signal generating section begins creation of a horizontal synchronous signal, and a counter begins counting a pulse of the horizontal... | 04/08/2008 |
| 7327399 | Method and a circuit for deriving a synchronisation signal from a video signal A method for deriving a synchronisation signal (35) from a video signal comprises tracking the blanking level (107) of the video signal with first and second slice level signals (26, 27) and tracking the sync tip level (110) of the horizo... | 02/05/2008 |
| 7324162 | Method and apparatus to improve ADC dynamic range in a video decoder A video decoder in which 1) resolution quality can be improved for a given bit count analog-to-digital converter, 2) a lower bit count analog-to-digital converter can be used with substantially similar quality or 3) a combination of improved resolution quality with ... | 01/29/2008 |
| 7295234 | DC level control method, clamp circuit, and imaging apparatus A dc level control method for holding a dc level of a clamp portion in an electric signal to be a prescribed value is disclosed, wherein the method comprises the steps of: comparing a dc level of a sampling interval in said electric signal with a predetermined refer... | 11/13/2007 |
| 7250986 | External output video signal processor The object of the invention is offering an external output video signal processor, which does not need coupling capacitor or clamping circuit. A system controller outputs a video signal by which the sync. tip level and the pedestal level were fixed to a predetermine... | 07/31/2007 |
| 7233365 | Digital DC restore methods and apparatus Digital dc restore methods and apparatus to restore the DC component of an analog waveform to a quantized reference value level at a given temporal point on a waveform, prior to an ADC. This may used to establish the relationship between the full scale digital value... | 06/19/2007 |
| 7208983 | Image-sensor signal processing circuit By flexibly coping with both image sensors of a CCD sensor and a CMOS sensor without providing any external circuit, a signal processing is performed. In a sensor selecting switch provided in an image-sensor signal-processing circuit, first and fourth switches are t... | 04/24/2007 |
| 7189953 | Signal processing circuit, image sensor IC, and signal processing method A signal processing circuit has a sample/hold circuit for sampling an input signal comprised of a first signal and a second signal and for holding the first signal. The first signal comprises an optical signal obtained due to storage of electric charges generated du... | 03/13/2007 |
| 7184097 | On-screen display apparatus The present invention provides an on-screen display apparatus which can eliminate variations in the DC level at a time when an input chroma signal and an OSD chroma signal are switched, and prevent an erroneous display of color. The on-screen display apparatus of th... | 02/27/2007 |
| 7176985 | Clamping circuit for video signals An apparatus, system and method for clamping a video signal input to a coupling capacitor (215) for providing a clamping voltage. A charging current is applied to the capacitor (215) via an amplifier (225) having a first input (227) coupl... | 02/13/2007 |
| 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 |
| 7106387 | Keyed clamp circuit The keyed clamp circuit of this invention has the clamp circuit for clamping the video signal including the equalizing pulse and the vertical synchronization signal based on the clamp pulse, the synchronization signal separation circuit for separating the synchroniz... | 09/12/2006 |
| 7102698 | Method and apparatus for controlling brightness of image processing device A method and apparatus for controlling the brightness of an image processing device to improve a brightness characteristic of an image signal, by reducing a pedestal voltage range and correspondingly expanding a brightness control voltage range in a highlight mode. ... | 09/05/2006 |
| 7095452 | Clamp circuit for clamping a digital video signal A clamp control circuit outputs a clamp control signal after a delay of a predetermined time if a digital video signal is detected. A sampling circuit that extracts sampling data of a pedestal level from a luminance corrected signal based on a clamp pulse at a timin... | 08/22/2006 |
| 7061531 | Solid state imaging device having timing signal generation circuit and clamping circuit An imaging device uses a solid state imaging element, during multi-field accumulation to prevent shading and oscillatory phenomena such as repeated black and white patterns. A signal is supplied from a timing signal generation circuit to switches, and controls the O... | 06/13/2006 |
| 7050116 | Calibration device for a video input stage An input stage for a video receiver includes a variable gain amplifier, an analog-to-digital converter for sampling a video signal and a digital processing unit for processing digital samples of the video signal. An analog regulating circuit sets an input potential ... | 05/23/2006 |
| 7030936 | Pedestal level control circuit and method for controlling pedestal level In order to reduce a circuit scale such as a brightness adjustment circuit or the number of pins in an IC chip, in the brightness adjustment circuit, a brightness adjusted video signal (internal video signal) output from an analog signal synthesis circuit or a D/A c... | 04/18/2006 |
| 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 |
| 6965417 | Signal processor An object of the present invention is to provide a signal processor which improves the offset accuracy of a video signal without increasing the number of bits of a circuit. An N-bit adder (103) adds a video signal (S101) and an upper-N-bit signa... | 11/15/2005 |
| 6952240 | Image sampling circuit with a blank reference combined with the video input A programmable gain amplifier having three separately programmable amplifiers. A programmable transconductance amplifier is followed by a programmable transimpedance amplifier, then a programmable switched capacitor amplifier. In one embodiment, this programmable ga... | 10/04/2005 |
| 6943756 | Device for enhancing contrast in liquid crystal display projection system A device for enhancing contrast for a liquid crystal display (LCD) projection system is provided. The contrast enhancing device includes an image driver supplying an image signal, a LCD panel for converting the input image signal into an optical image signal, and a ... | 09/13/2005 |
| 6867816 | Method and device to display an index of teletext pages A teletext program includes several teletext pages, with each teletext page being broadcast in the form of a set of data packets. A method for displaying a teletext program index on a television receiver screen includes receiving a teletext page which includes the s... | 03/15/2005 |
| 6791623 | Image display system An image display system includes a memory for storing at least one scanning line of an inputted video signal of the interlace scanning system, and reading means for repeating to read the video signal of one scanning line from the memory at a speed which is n (n is a... | 09/14/2004 |
| 6633340 | Video signal processor A video signal processor reduces the deterioration of image quality due to the superposition of noise on a sync signal included in a luminance signal. A frequency discriminator outputs a first error signal if a ratio of the frequency of a frequency-modula... | 10/14/2003 |
| 6580465 | Clamp voltage generating circuit and clamp level adjusting method A low pass filter smooths a voltage corresponding to a least significant bit of a digital image signal outputted from an A/D convertor, and outputs the smoothed voltage to a sample-and-hold circuit. In the sample-and-hold circuit, a sample-hold-pulse is a... | 06/17/2003 |
| 6535255 | Illumination intensity correcting circuit An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage... | 03/18/2003 |
| 6490003 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 12/03/2002 |
| 6490004 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 12/03/2002 |
| 6483549 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 11/19/2002 |
| 6400412 | Video signal processing apparatus with time adjustment of digital chrominance signal A video signal processing apparatus having first and second analog/digital converters for converting imputted analog luminance and chrominance component signals into digital luminance and chrominance component signal. Frequency band limiting filters, disp... | 06/04/2002 |
| 6320626 | Apparatus and method for controlling brightness in a monitor screen There is provided a device for controlling the brightness of a monitor screen to prevent the edge of the screen from appearing darker than the center of the screen by setting a black level signal scanned to the edge of the screen to be greater than a blac... | 11/20/2001 |
| 6317163 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 11/13/2001 |
| 6281943 | Cut-off control circuit for adjusting white balance Cut-off control circuits implementing DC-coupling and AC-coupling to CRT cathodes can employ the same preamplifier integrated circuits with few additional components. The preamplifier includes a switching unit for receiving control data, generating a cont... | 08/28/2001 |
| 6219107 | Automatic AGC bias voltage calibration in a video decoder A video decoder circuit is provided with automatic AGC bias voltage calibration. The video decoder circuit has an input for receiving a video signal that is capacitively coupled to an analog front-end circuit. The decoder circuit includes a microprocessor... | 04/17/2001 |
