Class 348/684 - Keyed

Subclass of Class 348 - Television
Definition: Subject matter wherein the range control is made operative
No. of patents: 35
Last issue date: 07/07/2009

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Number	Title	Issue Date
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 amplitude measuring circuit (108) at a constant value, and...	07/07/2009
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
7154495	Analog interface structures and methods for digital displays Structures and methods are provided for generating a digital display signal from an analog signal that is limited to 2N discrete analog levels and from a synchronization signal that defines spatial order for the digital display signal. These structures an...	12/26/2006
7154563	Automatic brightness limitation for avoiding video signal clipping A brightness limitation system is employed in a television circuit to prevent the black reference voltage level and the video signal from entering a minimum signal clipping zone, to provide precise correction signal, limiting the brightness, to maintain a constant b...	12/26/2006
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
7046260	Menu generating method and recording device for a record carrier The present invention relates to a menu picture generating method and to a recording device for recording a menu picture on a record carrier (20), wherein a key frame picture is scaled and then compressed before being assembled by a slice replacement operatio...	05/16/2006
5953069	Sync separator circuit Sync separator and video detector circuits, including a sync tip clamp having symmetrical and non-symmetrical clamps. The symmetrical clamp clamps the input video signal to a reference voltage during composite sync pulses, so the coupling capacitor discha...	09/14/1999
5410363	Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location An automatic gain control circuit 16 that can be used in a video transmission system 10 includes transmitter circuitry 18, receiver circuitry 20, and a fiber optic link 22 connected therebetween. The transmitter circuitry 18 injects an automatic gain cont...	04/25/1995
5202762	Method and apparatus for applying correction to a signal used to modulate a background video signal to be combined with a foreground video signal An apparatus and method which control the gain of the key signal dynamically and thereby compensate for the effects of an unevenly lit backing or lens vignetting. This dynamic control occurs over a video frame and has the effect of modulating the key sign...	04/13/1993
5177787	Scrambler with self-calibration The invention is directed to an improved scrambler capable of self-calibrating output signals. In one embodiment, the scrambler provides an encoded signal along separate signal pulses. A portion of one signal is made to correspond to a portion of another ...	01/05/1993
5133009	Method and apparatus for defeating the operation of an IC built-in noise inverter Apparatus for defeating a noise inverter disposed within the IC includes circuitry for changing the amplitude of the AGC signal applied to an AGC amplifier prior to the noise inverter so as to lower the level of the signal fed to the noise inverter. As a ...	07/21/1992
4884140	Vignetting compensating circuit for a video camera A vignetting compensating circuit for a video camera utilizing the horizontal synchronizing signal and the vertical synchronizing signal. The circuit prevents vignetting on the screen from a signal generated by a video camera with a zoom lens by obtaining...	11/28/1989
4790011	Auto clamp for modulator for suppressed sync signals Suppressed sync pulses in a scrambled video signal are restored to their proper level in another video signal that is applied to a clamp circuit for controlling the DC level of an amplifier coupled between the head end encoder and the modulator in a CATV ...	12/06/1988
4731838	AGC circuit used in a CATV receiver An AGC circuit used in a subscriber's receiver of a CATV system in which the television signal is scramble-modulated so that only subscribers are allowed to view toll programs, wherein the detected video signal is conducted through a low-pass filter to ex...	03/15/1988
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
4660083	Video display system with stabilized background level A video monitor includes a kinescope driver amplifier AC coupled to a kinescope via a capacitor which is also associated with a video signal clamp. A control signal related to the magnitude of video signals coupled to the kinescope modifies the kinescope ...	04/21/1987
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
4626910	Circuit for preventing flicker attributable to field signal-frame signal conversion In a field signal-frame signal conversion system including means for applying a delayed field signal delayed by 1/2 of one horizontal scanning period and a thru field signal, which is the same as the above field signal but not delayed, and switching means...	12/02/1986
4599641	Brightness control apparatus for a video signal processing system Brightness control apparatus for a color video monitor employing AC coupled video output driver stages is disclosed. A keyed amplifier provides a brightness determinative output pulse with an amplitude related to the setting of a brightness control couple...	07/08/1986
4598318	Video encryption system An encrypted video distribution system includes a signal-originating head end for scrambling outgoing television program-bearing signals. In particular, the video content of selected lines is inverted about a reference voltage level, and the inversion ref...	07/01/1986
4583121	Backporch gating pulse generator subject to disabling during vertical sync interval In a TV receiver, a line-rate gating pulse generator includes a source of line-rate timing pulses of "backporch" timing relative to the horizontal blanking intervals of received TV signals. Normally, the time constant of a capacitor charging circuit, enab...	04/15/1986
4507682	Self-gated AGC detector An AGC gate signal generating circuit for a television receiver comprises a series RC circuit having a time constant for developing a charging current at a relatively slow rate in relation to a horizontal scanning line of a video signal and at a relativel...	03/26/1985
4472739	AGC System for a television receiver AGC system for a television receiver having a keyed AGC circuit, a peak or average AGC circuit and a switching circuit between a video signal intermediate frequency amplifier circuit and an video signal detection circuit, wherein automatic gain control (A...	09/18/1984
4359755	Gating network for a sampling circuit A gating network is described for enabling and disabling a conventional sampling circuit. The gating network includes a pulse generator which develops an enabling pulse in time synchronism with the signal to be sampled by the sampling circuit. The enablin...	11/16/1982
4346398	Automatic clock phase selector An automatic clock phase selector for applying input pulses of selected phases to a counter to enable an AGC gate generator and a burst-gate generator during selected time intervals is described. The automatic clock phase selector includes a generator for...	08/24/1982
4316214	Keying signal generator with input control for false output immunity A source of keying signals for use by keyed circuits in a television receiver comprises a keyed transistor, an input coupling circuit including a timing control circuit responsive to video sync signals for timing the operation of the keyed transistor to n...	02/16/1982
4313130	Keying signal generator with false output immunity A circuit for generating a composite keying signal comprises a gate pulse generating circuit and a voltage translating network in a television receiver also including keyed video signal processing circuits. The composite keying signal comprises a first pu...	01/26/1982
4295166	Failure compensated automatic kinescope beam current limiter An automatic kinescope beam current limiter for a television receiver includes a source of derived beam current representative voltage, a keyed sampling circuit for developing an output beam current control voltage on a charge storage capacitor in respons...	10/13/1981
4218708	Keyed AGC circuit A keyed AGC circuit is responsive to the peak level of synchronizing signal components of a composite video signal for generating an AGC control voltage in a television receiver. A peak detector samples the peaks of the synchronizing signal components dur...	08/19/1980
4214260	Circuit for the line synchronization in a television receiver having a gated auxiliary control loop A line synchronization circuit in a television receiver in which gate pulses are derived from the oscillatorsignal for keying-out the synchronizing signal, in which the gate pulses are positioned by means of a phase-control loop symmetrically with respect...	07/22/1980
4213151	AGC keying signal circuit An automatic gain control keying signal circuit is provided for generating an automatic gain control (AGC) keying signal for a television AGC circuit. A keying signal is produced upon the normal coincidence of a sync pulse from the sync separator and a ho...	07/15/1980
4212032	Synchronization and gain control circuit A circuit is provided for developing a television synchronization signal and an automatic gain control (AGC) signal. A composite video signal is coupled to the input of a D.C. threshold noise inverter which inverts impulse noise above a predetermined thre...	07/08/1980
4185299	Synchronization signal separator circuit A synchronization signal separator circuit is provided for separating the synchronizing signal components of a composite video signal. A composite video signal containing negatively-directed synchronizing pulse components is coupled to one input of a diff...	01/22/1980
4172239	Signal attenuator A circuit is provided for protecting an amplifier from signal overload upon the application of strong signals at the input to the amplifier. A unidirectionally conducting semiconductor device and a capacitor are serially coupled between the input to the a...	10/23/1979
3931467	Synchronizing circuit having a variable bandpass filter In a television receiver, an automatic phase control includes a phase detector which generates a control signal passed by a bandpass filter to a horizontal oscillator in order to synchronize locally generated horizontal pulses with the received horizontal...	01/06/1976

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Class 348/684 - Keyed