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7557866 |
Automatic gain control circuit
An AGC control section ( 110 ) has a first operation mode for controlling the gain of a variable gain amplifier ( 103 ) to maintain the amplitude of the sync signal measured by a sync signal...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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4360825 |
Vertical drive generator and horizontal rate gate generator for a television receiver
A vertical drive generator and a horizontal gating generator are described which time-share circuitry common to both generators to provide vertical drive pulses and horizontal gating pulses for use...
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4323923 |
AGC-Clamped video amplifier
Disclosed is a DC-coupled video amplifier with AGC feedback having a stable operating point. Shifting of sync tip DC level resulting in a loss of synchronization of the video signal is compensated...
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4234892 |
AGC Circuit responsive to intermediate gray level in video signal
An AGC circuit comprises a video IF amplifier for receiving a amplitude-modulated broadcast wave of a video signal with a signal level having a constant amplitude added thereto, a means connected...
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4220931 |
Composite video automatic gain control amplifier
An amplifier for video signals transmitted by way of coaxial cable includes synchronizing signal separating means for gating synchronizing signals to a level detecting circuit, in order to produce...
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4216502 |
Peak detector circuit
A peak detector circuit is provided for detecting the maximum excursions of an amplitude varying signal. The circuit includes a network comprising a capacitor serially coupled to a charging...
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4176379 |
Video input circuits for video hard copy controller
Video input circuits are disclosed for a video hard copy controller of the type that converts and formats video signals into digital signals for application to a hard copy generating device. The...
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4149190 |
Automatic gain control for video amplifier
An automatic gain control circuit for controlling the gain of a video amplifier of the type adapted to amplify a composite video signal comprised of a video data component and a synchronization...
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4148068 |
Television synchronizing signal separating circuit
A television receiver has a tuner, an intermediate frequency amplifier, and a detector for recovering a composite signal including horizontal and vertical display synchronization components and...
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4144546 |
Television signal processing circuit for correcting amplitude distortions
Distortion introduced into a black and white or color television signal by for example private television repeaters or boosters in the input to a television receiver, particularly amplitude...
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4032973 |
Positive feedback high gain AGC amplifier
An automatic gain control circuit provides a high gain signal representative of the difference in amplitude between the synchronizing pulses of a composite video signal and a predetermined...
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4014038 |
Automatic gray scale control circuit for a color television receiver
The present invention relates to a novel automatic gray scale control circuit for a color television receiver. The circuit senses the cut-off voltage of each gun during the blanking interval, and...
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3936599 |
Automatic gain control system
An automatic gain control system applicable to a television receiver is described. Synchronizing pulses contained in the video detector output are sensed to obtain a measure of the signal strength....
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3914536 |
Identifier for a pulse code modulated signal
An identifier for detecting a pulse code modulated signal from a composite signal comprising a video signal and a pulse code modulated audio signal alternately transmitted in a predetermined...
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3736378 |
VIDEO SIGNAL PROCESSING STAGE WHICH PERFORMS PLURAL FUNCTIONS
A signal processing stage for a television receiver which performs the combined functions of video demodulation, automatic gain control voltage generation, horizontal synchronizing pulse...
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3609232 |
TRANSISTORIZED CONTROL CIRCUITRY FOR TELEVISION RECEIVER
Transistorized automatic gain control and sync separator circuitry which increases the input impedance of the sync separator at high frequencies, such as random noise condition, and prevents loss...
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3604844 |
VIDEO SIGNAL PROCESSING AMPLIFIER WITH AUTOMATIC GAIN CONTROL
Automatic gain control circuitry is disclosed for maintaining the chrominance and luminance levels of a composite color television signal at a constant value. First and second test signals are...
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3578908 |
AUTOMATIC PEAK VIDEO CONTROL SYSTEM
An automatic peak video control system for vidicon tubes in which the peak level of the video signal is detected and stored during each field scan of the vidicon. The detected signal is sampled,...
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3518370 |
MODULATION ERROR CANCELLING APPARATUS
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