Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7358882 | Video processing method and apparatus A video processing method and apparatus to employing an analog user interface and a digital video decoder. A working mode is provided, according to which analog control signals from the analog user interface are selectively directed to an analog-to-digital converter... | 04/15/2008 |
| 7283157 | Automatic level control (ALC) for video signals Disclosed are methods and systems for automatic level control (ALC) in a video signal processing system. The new ALC of the invention takes into account the gain applied to the video signal, such as that provided by an associated automatic gain control (AGC). Method... | 10/16/2007 |
| 7259799 | AGC detector and method for AGC detecting Disclosed is an AGC detector device and an AGC detecting method for television receivers displaying video pictures consisting of a plurality of horizontal lines to be built up successively, wherein a CVBS signal is inputted which includes horizontal sync pulses havi... | 08/21/2007 |
| 7230615 | Method and apparatus for coordinating horizontal and vertical synchronization signals In a signal coordinating method and apparatus, a pulse generating circuit receives a VSYNC signal and generates a plurality of critical pulses that define critical time periods from fields can control edges of the VSYNC signal. A determining circuit receives an HSYN... | 06/12/2007 |
| 7206030 | Fast-convergence two-stage automatic gain control (AGC) Disclosed are methods and systems for automatic gain control (AGC) in circuits. The disclosed methods and systems provide accurate and rapidly converging automatic gain control suited for video applications. According to disclosed preferred embodiments of the invent... | 04/17/2007 |
| 7136114 | Television receiver with dynamically adjustable filtering A television receiver includes a tuner stage, a selective filter stage connected to the tuner stage, and a intermediate-frequency stage connected to the selective filter stage. A field-strength-detection stage is also provided, which generates a field strength signa... | 11/14/2006 |
| 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 |
| 7068117 | Power supply ripple rejection in tuner oscillator stage A bipolar transistor (Tr) in an oscillator stage of a tuner is provided with a diode (D10) in series with a resistor (R11) coupled between the base of the transistor (Tr) and the reference voltage to which the emitter of the transistor (Tr) is coupled.... | 06/27/2006 |
| 7053960 | Systems and methods for adjusting image contrast Systems and methods for adjusting image contrast are provided. An exemplary method for adjusting image contrast includes determining a format of a television signal and outputting in conjunction with the television signal a reference level. If the television signal ... | 05/30/2006 |
| 6975683 | Radio frequency burst interference mitigation Coherent phase-shift keying (“PSK”) radio frequency (“RF”) systems locate a differential decoder (“DE”) close to the transmitter of a first transceiver for transmitting a message to a second transceiver that includes a receiver having has a differential ... | 12/13/2005 |
| 6970052 | Modulator immune from temperature variation-induced change in modulation factor A modulation factor is kept immune from the influence of temperature variation. A modulator is provided with an operational amplifier to one of whose input ends are inputted video signals and to the other is applied a reference voltage and a video mixer into which a... | 11/29/2005 |
| 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 |
| 6903782 | System and method for performing segmentation-based enhancements of a video image There is disclosed an apparatus for performing segmentation-based enhancements of a video image. The apparatus comprises: 1) an input buffer for storing video frames of an incoming video signal; 2) a segmentation controller capable of segmenting a first stored frame... | 06/07/2005 |
| 6295095 | Video signal character converting device and method of the same In a video signal character converting device, a sampling window signal generator generates a signal for sampling an input video signal "a". A video scene amplitude discrimination circuit samples the video signal in response to the sampling signal, detect... | 09/25/2001 |
| 5986719 | Video signal clamping method and apparatus with negative peak detection A video clamping apparatus is described which uses transistors manufactured in a CMOS process to clamp an input video signal to a reference level during a SYNC period. A closed-loop system is provided which includes a buffer amplifier, a sample-and-hold d... | 11/16/1999 |
| 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 |
| 5838390 | System and method for multi-level gain control An analog to digital converter circuit having sync control is constructed to monitor the sync condition of the digital output. When sync is lost, for example due to a low input signal level or due to an out of phase situation, the gain of the output incre... | 11/17/1998 |
| 5790203 | Detector of color television standard with low reception threshold A circuit for identifying the standard of a color television signal includes a gain-controlled amplifier for standardizing an amplitude of oscillations of a composite video baseband signal during a reference burst centered on a reference level. The burst ... | 08/04/1998 |
| 5764309 | Sync compensated AGC system for VSB receiver A technique and apparatus for developing AGC voltage in a receiver capable of receiving VSB signals that do not have the average magnitudes of the data symbol levels and the sync symbol levels related so as to produce the same average level. One technique... | 06/09/1998 |
| 5638137 | Configurable video output channel architecture A configurable video output channel architecture includes a plurality of parallel video pipelines arranged to drive a video display; a device for selecting an output of one of the video pipelines and generating a readback signal representative thereof; an... | 06/10/1997 |
| 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 |
| 5502498 | Clamp signal generation-control circuit and a method therefor A clamp signal generation-control circuit includes a clamp signal controller for discriminating the existence of a sync on green signal and a separate sync signal supplied from a video card to a monitor to output a control signal according to the discrimi... | 03/26/1996 |
| 5416524 | Digital television synchronization system and method A digital television signal includes data sent as multilevel symbols in successive data segments each including a synchronizing sync character. The detected synchronizing sync character produces a characteristic having two opposite polarity levels separat... | 05/16/1995 |
| 5410364 | Method and apparatus for removing AGC pulses and other undesirable signals from a video signal AGC pulses and other undesirable signals are removed from a video signal by generating a replica of the AGC pulses or other signals and then mixing the replica with the original video to effect their removal.... | 04/25/1995 |
| 5361101 | Preamplifier for multimedia display An RGB preamplifier for a video display includes respective multipliers independently operable for adjusting the contrast of input primary and secondary video signals. The contrast adjusted video signals are added to form a combined display signal, the co... | 11/01/1994 |
| 5341173 | Automatic gain control circuit An automatic gain control circuit includes a first amplifier for receiving a video signal to produce a first signal with a gain varied in response to a control signal, a low-pass filter for removing a color component from the first signals to produce a se... | 08/23/1994 |
| 5331352 | Contrast control wherein reference pulse detection occurs every other line period and wherein clamping occurs in remaining line periods The present invention provides a contrast control circuit capable of controlling the contrast even if the back porch is comparatively short. The contrast control circuit comprises monostable multivibrators (24, 26) which provides a background pulse and a ... | 07/19/1994 |
| 5245434 | Autopix circuit with inserted vertical blanking A TV system includes a selectively enabled blanking network for introducing blanking into the autopix feedback loop during vertical blanking periods. The TV system includes a contrast control section responsive to color signals whose output is coupled to ... | 09/14/1993 |
| 5157493 | Synch responsive agc utilizing A-D converter Disclosed is an apparatus for the reception of video signals with a variable gain amplifier to hold the video signal between pre-determined limits. To control the gain of the amplifier, there is provision for a circuit that keeps the amplitude of the line... | 10/20/1992 |
| 5132828 | Analog video fiber optic link Described is an electro/optical system for transmitting video information. The system includes a transmitter assembly interconnected via a fiber optic assembly to a receiver assembly. The transmitter assembly includes a circuit arrangement which generates... | 07/21/1992 |
| 5018012 | Video signal stretcher The video signal stretcher comprises a signal adjusting circuit for adjusting a ratio of a synchronizing signal range to a video signal range, which video signal composes a composite picture signal together with the synchronizing signal, to become a prede... | 05/21/1991 |
| 4970592 | Horizontal synchronization, clock synchronization, D.C. restoration and gain control scheme for an analog TV system An analog TV system includes a transmitter which produces a horizontal unique pulse sequence during each horizontal blanking interval. The pulse sequence is amplitude modulated between two levels to define a horizontal unique word for horizontal synchroni... | 11/13/1990 |
| 4829377 | Horizontal synchronization, clock synchronization, D. C. restoration and gain control scheme for an analog TV system An analog TV system includes a transmitter which produces a horizontal unique pulse sequence during each horizontal blanking interval. The pulse sequence is amplitude modulated between two levels to define a horizontal unique word for horizontal synchroni... | 05/09/1989 |
| 4695886 | Automatic leveling circuit for a composite video signal An automatic leveling circuit for a composite video signal is disclosed for use in a modem in a microwave communications system for adjusting the level of the signal at the transmitter while maintaining studio quality. The circuit employs an operational a... | 09/22/1987 |
| 4667242 | Automatic gain control circuit An automatic gain control (AGC) circuit for performing an AGC for a picture signal. The AGC circuit includes an amplifier for amplifying the picture signal, a clamping circuit for fixing a tip-end level of a synchronous signal component of the picture sig... | 05/19/1987 |
| 4658297 | Automatic gain control circuit An automatic gain control (AGC) circuit 30 includes a pulse mixing circuit 31 for mixing a reference pulse P having a specified amplitude in a pedestal of a composite video signal with a sync-tip level of a synchronizing signal clamped. Based on the refer... | 04/14/1987 |
| 4625240 | Adaptive automatic gain control A method and apparatus for optimally processing television compressed audio signals by adaptively controlling the gain of the apparatus. The average value of the digitized signal is compared to a reference value to produce a gain control signal. A variabl... | 11/25/1986 |
| 4581641 | Video noise detector Noise in a composite video signal is detected by looking for the presence of excessive pulses resembling broad pulses or insufficient horizontal sync pulses. The output of the detector is averaged by a low pass filter, the output of which is, in turn, app... | 04/08/1986 |
| 4554581 | STV Decoder with improved data signal recognition capability An addressable subscription television decoder includes an input stage including an IF amplifier for converting a scrambled RF television signal to a composite baseband video signal. The baseband video signal comprises either a nominal sync component or a... | 11/19/1985 |
| 4434439 | Digital television AGC arrangement An automatic gain control arrangement is provided for an analog to digital (A/D) converter in a television signal processing system. A gain-controlled source of analog signals applies a video information signal to the input of an A/D converter. The A/D co... | 02/28/1984 |
