Class 348/548 - Countdown

Subclass of Class 348 - Television
Definition: Subject matter including a resetting divider for controlling
No. of patents: 37
Last issue date: 05/04/2010

Number	Title	Issue Date
7710501	Time base correction and frame rate conversion Apparatuses and methods are described for performing time base correction and frame rate conversion with respect to signals. An apparatus includes circuitry to synthesize an output video clock. The apparatus has circuitry that receives an input video synchronization...	05/04/2010
7327401	Display synchronization signal generation apparatus and method in analog video signal receiver A display synchronization signal generation apparatus and method, which make it possible to display a stable image irrespective of changes of horizontal and vertical frequencies of a received analog video signal in an analog video signal receiver. The display synchr...	02/05/2008
7321398	Digital windowing for video sync separation A processing circuit for a sync signal includes a trial circuit and a windowing circuit. The trial circuit includes a counter that generates a count value proportional to the duration between successive sync pulses. When the count value reaches a trial sync spacing ...	01/22/2008
7269331	Apparatus and method of displaying video output An apparatus for displaying video output with dynamically adjustable drop rate to control playback quality. The inventive apparatus includes a playback engine, a pre-fetch engine, a rendering engine, and a drawing engine. The playback engine sends a pre-fetch requir...	09/11/2007
7268711	Method and circuit for amplitude compensation in a digital-to-analog converter An amplitude-compensated digital-to-analog converter circuit and method of compensation. A unipolar digital-to-analog converter is provided, having a reference connection and a pair of differential, unipolar signal outputs. A sensing circuit senses the common mode c...	09/11/2007
6947060	Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance...	09/20/2005
6908037	Circuit for generating clock signal and decoding data signal for use in contactless integrated circuit card An integrated circuit card includes a circuit for generating a clock signal and restoring data. The circuit includes a receiver for receiving a radio frequency signal having a pause period; a divider for dividing the received signal; a first counter for counting a p...	06/21/2005
6222590	Phase-locked loop circuit In a phase-locked loop circuit, a vertical synchronous separation circuit separates a vertical sync signal from a composite synchronizing signal to detect part of a vertical synchronizing period. A mask circuit masks the composite synchronizing signal dur...	04/24/2001
6195130	Vertical timing signal generating circuit There is provided a vertical timing signal generating circuit which can operate stably irrespective of the phase relationship between a vertical synchronous signal and a vertical timing signal generated by a counter, and can provide a vertical timing sign...	02/27/2001
5917551	Synchronization stabilizing circuit and television signal receiver In a synchronization stabilizing circuit and a television signal receiver, the follow-up range (TX) of the synchronizing signal (SH) is changed based on the judged result (J1) that it is judged whether or not the synchronizing signal (SH) itself exists an...	06/29/1999
5872601	Circuit arrangement for automatically recognizing the line standard of a video sync signal A circuit arrangement for automatically recognizing the line number of a video sync signal in accordance with the 525 or 625 line standard, this circuit arrangement automatically generating a control signal corresponding to one of the relevant line number...	02/16/1999
4897723	Circuitry for and method of generating vertical drive pulse in video signal receiver The vertical drive pulse generator comprises a gate (59) passing a vertical synchronizing signal included in received video signals in response to a control signal, a counter (60; 360) counting a clock signal (CL) of 2fH (fH : a freq...	01/30/1990
4868659	Deflection circuit for non-standard signal source A deflection circuit for a video apparatus operates in a countdown mode in which synchronization of the vertical deflection circuitry is accomplished in precise relationship to the horizontal deflection frequency. In order to permit countdown operation fo...	09/19/1989
4845563	Vertical driving pulse generating circuit A reset pulse having a desired pulse width is generated in a reset pulse generating circuit 14 in response to a vertical synchronizing signal selected and outputted from input selecting circuit 13 or a frequency-divided output signal of a vertical count d...	07/04/1989
4729023	Mode recognition for vertical countdown An improved vertical countdown system for a television receiver which recognizes weak signal conditions in the received signal. Upon recognition of weak signal conditions or a noise indication from a noise dectector, circuitry provides a signal which is u...	03/01/1988
4631587	Field responsive vertical pulse generator In an NTSC television system there are an odd number (262.5) of horizontal lines in each field. This relationship causes a 50% duty cycle horizontal rate signal (H) to be high during one specific horizontal half line in one field and low for that same hor...	12/23/1986
4605965	Universal vertical countdown and method for video display A universal vertical countdown and method for a video display is provided which will handle all standard vertical signals and systems while giving the same noise performance as a self-locking system. Control of the resetting of the countdown during the ac...	08/12/1986
4598234	Digital image correction circuit for cathode ray tube displays A digital electron optics correction circuit for correcting the focus and astigmatism in a displayed image on a CRT is disclosed. The circuit includes a clock generator for generating a selected number of pulses between each horizontal blanking synchroniz...	07/01/1986
4583118	Circuits for converting from one television scanning standard to another A circuit for converting a TV receiver to operate in accordance with the system associated with received signals, there being either F or F' scan lines in a field, with F	04/15/1986
4523227	System for synchronizing a video signal having a first frame rate to a second frame rate A synchronizer receives from a tape playback arrangement television frames at a rate which is slightly higher or slightly lower than a standard frame-rate. The synchronizer includes four frames of storage, and reading and writing are continuous. In a mode...	06/11/1985
4489343	Television image receiver provided with vertical synchronizing circuit count system In a television image receiver provided with a vertical synchronizing circuit of a count-down system, a down counter to be reset in the an even number of pulse section among the pulses to be partitioned off by the undercuts in the vertical synchronizing s...	12/18/1984
4468699	Circuit arrangement for the control of the vertical deflection Field synchronizing circuit arrangement for a television device, in a television receiver or a video magnetic tape reproduction, a frequency divider circuit coupled to the line oscillator producing a field control signal defined by the standard in the abs...	08/28/1984
4349839	Vertical sync counter having multi modes of operation for different TV systems standards A TV receiver having a single vertical sync counter is combined with various gates and a latch circuit to provide two modes of operation. In the first mode of operation, the vertical counter counts up to a first predetermined number of pulses at which tim...	09/14/1982
4319276	Television receiver synchronizing arrangement A television receiver including a synchronizing arrangement for providing line and field drive pulses for line and field output stages, which synchronizing arrangement comprises a line oscillator control circuit for controlling the frequency and/or phase ...	03/09/1982
4303940	Raster manipulated television receiver A television receiver is disclosed for selectively displaying either a 525 line NTSC video signal or a 625 line European teletext or Viewdata signal. The receiver includes two vertical countdown circuits: a 525 line countdown circuit for use in generating...	12/01/1981
4298890	Digital vertical synchronization system for a television receiver A digital vertical synchronization system for a television receiver has a source of locally generated vertical sync pulses coupled to a vertical sweep system, a source of derived vertical sync pulses developed from and in a time relationship with received...	11/03/1981
4253117	Multivibrator synchronization system for video display A system for increasing synchronization signal injection to a free-running multivibrator in the horizontal drive circuit of a video display which enhances synchronization signal frequency capture range is disclosed. A reduction in synchronization input si...	02/24/1981
4245251	AFPC Phase detector with no output from alternate sync pulses A gating circuit coupled to the phase detector of an AFPC loop prevents response of the phase detector to alternate sync pulses during the equalizing and vertical sync pulse interval....	01/13/1981
4231064	Vertical synchronization circuit for a cathode-ray tube A vertical synchronization circuit for a cathode-ray tube comprises an oscillator for generating, in response to the horizontal synchronizing signal of an input video signal, clock pulses at twice the horizontal scanning frequency; a counter for counting ...	10/28/1980
4228461	Vertical synchronization system A two-mode digital vertical synchronization system is described for controlling the phase synchronization of vertical scan in a television receiver. In one mode, the system searches for incoming vertical sync pulses which occur during a wide sync "window"...	10/14/1980
4227214	Digital processing vertical synchronization system for a television receiver set A digital vertical synchronization system for use in a television receiver is disclosed. A vertical synchronization separator circuit receives a composite synchronizing signal and separates a vertical synchronizing signal from the composite signal. A cloc...	10/07/1980
4224639	Digital synchronizing circuit The invention relates to a circuit arrangement for vertical synchronization of a television receiver. Vertical synchronization pulses are generated by dividing pulses derived from a line frequency signal and these signals are compared with the received sy...	09/23/1980
4096528	Standard/nonstandard internal vertical sync producing apparatus Apparatus for producing internal vertical sync signals from a source of standard and nonstandard rate external vertical signals. The apparatus includes a counting and reset arrangement for generating internal vertical sync signals in synchronization with ...	06/20/1978
4063288	Vertical synchronizing circuit A vertical synchronizing circuit wherein a counter counts pulses at twice the horizontal deflection rate and provides a vertical output pulse at a predetermined count is shown. A synchronism or mode detector causes the circuit to switch to a driven mode w...	12/13/1977
4025952	Vertical synchronizing circuit A vertical synchronizing circuit wherein noise pulses or signals which may accompany vertical synchronizing pulses are locked out for a predetermined time subsequent to the receipt of a vertical synchronizing pulse is shown. A counter counts pulses at the...	05/24/1977
4025951	Vertical synchronizing circuit having adjustable sync pulse window A vertical synchronizing circuit wherein a counter counts pulses at twice the horizontal deflection rate and provides a vertical output pulse at a predetermined count is shown. A synchronism or mode detector causes the circuit to switch to a driven mode w...	05/24/1977
3935388	Circuit arrangement for synchronizing a television receiver The invention provides a circuit for centrally generating the horizontal and vertical sweep frequencies in a TV receiver. A central oscillator provides a frequency which is divided to obtain the horizontal frequency. A periodic counter with adjustable fin...	01/27/1976

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Class 348/548 - Countdown