| Patent Number |
Title Of Patent |
Date Issued |
| 5845039 |
Time-base correction in a video recording/playback system |
December 1, 1998 |
| A video recording/playback system includes in its recording electronics time-base correctors both for luma signal and for color-under signal, the time-base corrector for luma signal being used to facilitate comb filtering and the time-base corrector for chroma signal being used to ma |
| 5412481 |
Time-base correction in a video recording/playback system |
May 2, 1995 |
| A video recording/playback system includes in its recording electronics time-base correctors both for luma signal and for color-under signal, the time-base corrector for luma signal being used to facilitate comb filtering and the time-base corrector for chroma signal being used to ma |
| 5337091 |
Video IF amplifier with auxiliary IF amplifier for intercarrier sound & AFT |
August 9, 1994 |
| In a television receiver a downconverter responding to a selected television signal respectively supplies its first and second output signals as the input signals of first and second IF amplifiers, respectively. The downconverter includes a local oscillator for generating oscillation |
| 5218449 |
Nervous clock signal generator for video recorder |
June 8, 1993 |
| A video recorder for recording composite video signals includes an analog to digital converter for digitizing samples of the composite video signal being recorded. A sync separator separates horizontal synchronizing information from the composite video signal being recorded. Filtering |
| 4775890 |
Phase detector |
October 4, 1988 |
| A horizontal phase detector of a television apparatus receives an analog composite video signal that is sampled and digitized at a rate determined in accordance with a clock signal. The leading edge of a simulated sync pulse signal is computed from the digitized signal using interpolatio |
| 4703340 |
Frequency division multiplexed analog to digital converter |
October 27, 1987 |
| A digital television receiver, having a line locked clock, includes a first digital phase locked loop which regenerates quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of composite video signals into color inform |
| 4700217 |
Chrominance signal phase locked loop system for use in a digital television receiver having a li |
October 13, 1987 |
| A digital television receiver which uses a line-locked clock signal employs chrominance signal demodulation circuitry which produces a digital oscillatory signal that is locked in phase to the color reference burst signal component of the incoming video signals. An analog voltage con |
| 4698679 |
Sync separator |
October 6, 1987 |
| A sync separator detects, in a corresponding part of the waveform of a video signal, the occurrence of the trailing edge of a corresponding sync pulse, in accordance with the rate of change of the video signal. Information obtained from the sync tip and the back porch portions of the |
| 4697211 |
Sync separator with periodic updating |
September 29, 1987 |
| A sync separator detects the occurrence of a corresponding sync pulse in a corresponding part of the waveform of a composite video signal. The level of the sync tip is used for updating a slice level signal, provided the level of the sync tip is lower than that of the preceding sync tip |
| 4694327 |
Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop |
September 15, 1987 |
| A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the sampling clock signal and de |
| 4689582 |
Phase-lock-loop circuit for a television apparatus |
August 25, 1987 |
| A digital phase-lock-loop circuit includes a generator that produces a horizontal rate output signal at a controlled frequency and a phase detector responsive to the output signal and to an incoming synchronizing signal. The phase detector is coupled to the generator control port via a |
| 4686560 |
Phase locked loop system including analog and digital components |
August 11, 1987 |
| A digital television receiver, having a line-locked clock, includes a partly digital, partly analog phase locked loop. This phase locked loop regenerates two quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of the |
| 4636836 |
Phase locked loop system for providing a phase shifted output signal |
January 13, 1987 |
| A phase locked loop system is described in the context of a digital television receiver. The system includes a band-pass filter which shifts the phase of burst samples provided to it by 33.degree.. This phase shift makes the zero-crossing points of the filtered burst signal coincident |
| 4635103 |
Phase locked loop system incorporating automatic gain control |
January 6, 1987 |
| An automatic gain control (AGC) circuit is described in the context of a phase locking system in a digital television receiver. The signal produced by the phase locking system is used to develop a sampling clock signal that is locked in frequency and phase to the color reference burst si |
| 4633298 |
Digitally controlled phase locked loop system having coarse and fine locking modes |
December 30, 1986 |
| A phase detector included in a digital television receiver develops first and second phase error signals based on samples of the color reference burst signal taken from one and two horizontal lines respectively. The first phase error signal is used to attain coarse synchronization betwee |
| 4517586 |
Digital television receiver with analog-to-digital converter having time multiplexed gain |
May 14, 1985 |
| A digital television receiver includes an analog-to-digital converter having a controllable scaling factor and offset. To improve resolution of the digital samples, the scaling factor is increased and the offset is changed when the synchronizing and color reference burst portions of the |
| 4514760 |
Digital television receiver with time-multiplexed analog-to-digital converter |
April 30, 1985 |
| In a television (TV) receiver having digital signal processing in which the video and sound signals are separated in the analog processing circuitry, one analog-to-digital converter (ADC) serves both the video and sound signal paths. The analog video and sound signals are multiplexed int |
| 4502078 |
Digital television receivers |
February 26, 1985 |
| An analog carrier signal and its sidebands contain modulated information which is to be digitally encoded and processed. Demodulation and digital encoding is accomplished in a single process by an analog-to-digital converter, which samples the analog signals in response to a sampling |
| 4471326 |
Current supplying circuit as for an oscillator |
September 11, 1984 |
| A circuit for supplying first and second currents to a load comprises two current generators for providing those currents during first and second time intervals and a resistance through which those currents flow. Two control potentials developed by two semiconductor junctions are applied |
| 4464675 |
Low frequency digital comb filter system |
August 7, 1984 |
| A comb filter arrangement operating at a reduced data rate is provided, which requires comparably fewer storage locations than previous arrangements. A digitized composite video signal of a given codeword rate is applied to a first bandpass filter, which produces a filtered signal re |
| 4456922 |
Reduced data rate comb filter system |
June 26, 1984 |
| Comb filter arrangements are provided for separating frequency interleaved signal components of a video signal. A video signal is sampled at a rate which satisfies the Nyquist criterion for the bandwidth of the signal, and the resultant signal samples are applied to a bandpass filter. Th |
| 4453183 |
Dual polarity sync processor |
June 5, 1984 |
| A synchronizing pulse processor accepts integrated and differentiated composite sync signal inputs of either positive or negative polarity. Processed horizontal and vertical sync pulses are produced which have a single predetermined polarity independent of the polarity of the composite |
| 4434439 |
Digital television AGC arrangement |
February 28, 1984 |
| 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 converter produces digitized vi |
| 4396948 |
Dual mode horizontal deflection circuit |
August 2, 1983 |
| A horizontal deflection turn-on circuit operates in the absence of trigger pulse normally derived by an AFPC loop. Under normal operation, the AFPC loop generates the trigger pulses based on a synchronized phase relationship with sampled flyback pulses. During receiver start-up, the |
| 4396873 |
SCR Regulator control circuit |
August 2, 1983 |
| A switching voltage regulator control circuit incorporating a switching device including a control electrode comprises means for sampling the output voltage of the regulator. A horizontal rate signal is combined with the sampled output voltage to provide a horizontal rate sample signal. |
| 4389676 |
Television receiver high voltage protection circuit |
June 21, 1983 |
| In a television receiver horizontal deflection circuit, the deflection circuit oscillator includes an LC resonant tank network that is excited into sustained oscillation to develop an oscillator alternating output signal. A high voltage generator is responsive to the oscillator output |
| 4385264 |
Start-up circuit for a power supply |
May 24, 1983 |
| A start-up circuit for a power supply used in a television receiver controls the operation of the power supply during a start-up interval. The power supply is disabled by the start-up circuit at a first voltage level until a capacitor is charged to a predetermined second voltage level. T |
| 4364026 |
Digital-to-analog converter useful in a television receiver |
December 14, 1982 |
| A digital-to-analog converter for use in a television tuning system to convert bits stored in a register to a corresponding tuning voltage includes a counter for generating binary pulse signals having pulses with durations proportional to powers of 2 and a plurality of selection gates |
| 4327376 |
Dual phase-control loop horizontal deflection synchronizing circuit |
April 27, 1982 |
| A television horizontal deflection synchronizing system uses two phase-lock loops. A horizontal oscillator operating at a frequency greater than the horizontal frequency is counted and a bilevel signal near the horizontal frequency is generated. A first phase-lock loop having a relativel |
| 4293870 |
Circuit arrangement for multiplexing an input function and an output function at a single termin |
October 6, 1981 |
| A circuit arrangement is provided for multiplexing an input signal and an output signal through a single circuit terminal. Means are coupled to the terminal for selectively applying first input signals to the terminal of a signal level included within a first range of signal levels. Mean |
| 4292654 |
Deflection system and switched-mode power supply using a common ramp generator |
September 29, 1981 |
| A television horizontal deflection system and a switched-mode power supply are provided which share a single sawtooth waveform generator for the generation of delayed deflection signals and delayed power supply gating signals, respectively. The sawtooth waveform generator has an input |
| 4282549 |
Pulse generator for a horizontal deflection system |
August 4, 1981 |
| A pulse generator is provided which may be advantageously used to produce a deflection drive signal in a television receiver. A capacitor is initially charged to a reference voltage level. Prior to the time at which the output pulse is to be generated, the capacitor is charged from a cur |
| 4266245 |
Differential amplifier current repeater |
May 5, 1981 |
| A differential amplifier is provided, including first and second emitter coupled transistors responsive to an input signal applied to one of their base electrodes, and a current source transistor having its collector-to-emitter path serially coupled between the coupled emitters of th |
| 4250525 |
Television horizontal AFPC with phase detector driven at twice the horizontal frequency |
February 10, 1981 |
| An AFPC loop for TV horizontal oscillator suitable for use with sync signals subject to timing instability includes means for maintaining a long response time during the equalizing and vertical sync intervals to reduce drift, and shortens the loop response time after the second equal |
| 4245251 |
AFPC Phase detector with no output from alternate sync pulses |
January 13, 1981 |
| 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. |
| 4243953 |
Voltage controlled oscillator presenting high impedance to parallel resonant tank circuit |
January 6, 1981 |
| A variable-frequency oscillator includes an oscillator portion coupled to a phase shifter and a controllable gain device for controlling the amount of phase-shifted signal reintroduced to the oscillator. The oscillator includes first and second transistors coupled at their emitters to a |
| 4228463 |
Switched AFPC loop filter with offset voltage cancellation |
October 14, 1980 |
| A television horizontal AFPC loop includes a filter, the time constant of which can be switched at the vertical rate for improved operation from standard broadcast signals and from video tape recorders. A transistor switch introduces a voltage offset which perturbs the AFPC filtered |
| 4227217 |
Multiplexing arrangement for a television signal processing system |
October 7, 1980 |
| A channel number display arrangement for a television receiver includes a multiplexer for alternately coupling binary signals representing the tens and units digits of the channel number of a selected channel to a single decoder and driver arrangement. To reduce visible effects of switch |
| 4216396 |
Sample-hold phase detector |
August 5, 1980 |
| A differential sample-and-hold circuit includes first and second emitter-coupled transistors the bases of which are coupled to the signal source to be sampled. A gated circuit source coupled to the joined emitters supplies operating current in the sampling mode and supplies no curren |
| 4200811 |
Frequency divider circuit |
April 29, 1980 |
| A relatively high speed, high density integrated circuit for dividing the frequency of an alternating signal includes first and second semiconductor boats formed on a substrate. The first boat includes a plurality of transistors having the semiconductor material of the boat as a common |
| 4164711 |
Tuning system including a memory for storing tuning information with user controls arranged to f |
August 14, 1979 |
| In a tuning system for a television receiver including tuning voltage circuitry for generating and thereafter storing binary signals representing tuning voltages corresponding to the various channels a viewer may select for controlling a voltage variable tuning element, skip channel |
| 4132927 |
Gating signal generator for switched pincushion correction circuit |
January 2, 1979 |
| A switched television pincushion correction circuit uses a controllable switch including an SCR gated at the horizontal deflection rate. The gating signal is a horizontal rate pulse which is duration-modulated at the vertical rate. A gating pulse generator includes a source of rectified |
