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| Number | Title | Issue Date |
| 4860380 | Autoprogramming tuner apparatus A system for automatically programming an inexpensive volatile memory in an RF tuner with data relating to receivable active channels, upon activation of the receiver by a user after a power failure. Since the system is responsive to the application of st... | 08/22/1989 |
| 4850039 | Transistor mixer A mixer for mixing first and second signals for providing a difference signal comprises a mixing transistor. The first and second signals are applied between the base and emitter electrodes of the transistor. A non-linear impedance is coupled in series wi... | 07/18/1989 |
| 4831652 | Stereo expansion circuit selection switch A stereo expansion circuit selection switch includes a transmission gate to cross couple the right and left channels as needed for stereo expansion.... | 05/16/1989 |
| 4763193 | Automatic determination of time base in electronic time-keeping apparatus An AC line signal of unknown frequency is compared to a signal of known reference to determine the frequency of the AC line signal. Thereafter, the AC line frequency signal is used as a time-base for keeping real time.... | 08/09/1988 |
| 4745402 | Input device for a display system using phase-encoded signals The invention relates to a display system using a remote control handunit having "pointing function" capability for moving a cursor displayed on a display screen by changing the angular position of the remote control handunit. Specifically, the individual... | 05/17/1988 |
| 4694414 | Digital delay interpolation filter with amplitude and phase compensation A digital input signal to be delayed is applied to a two-point linear interpolation filter which imparts delay to the signal proportional to the value of a delay control signal. Errors in both the amplitude and the phase of the delayed signal are minimize... | 09/15/1987 |
| 4694350 | Automatic bias control of an image display device in a video monitor A data display video monitor includes an automatic kinescope bias (AKB) control system for the type wherein kinescope cathode output pulses representative of the black current level conducted by the kinescope are produced in response to energizing the kin... | 09/15/1987 |
| 4691234 | Noise reduction circuit for television multi-channel sound A television receiver includes an audio signal processing arrangement for expanding a second audio program (SAP) signal compressed in accordance with the "dbx" system in a relatively simple manner. The signal processing arrangement includes a first filter... | 09/01/1987 |
| 4688249 | CATV system and method of curtailing reception of unauthorized service channels An "Anti-Piracy" system and method are disclosed which includes an FSK modulator at the head end CATV transmitting location which, in response to data from an addressing computer, randomly issues Anti-Piracy commands (APC) which are transmitted to the set... | 08/18/1987 |
| 4685002 | Slow motion television system having variable interlace A slow motion system includes a variable interlace constant line-rate video camera, a variable speed recorder and a line-rate converter connected in cascade. During slow motion shooting the camera interlace ratio is increased, the recorder playback speed ... | 08/04/1987 |
| 4683498 | Compatible wide-screen television system camera A solid-state imager for a television camera which generates a compatible wide-screen signal, i.e., a wide-screen signal with compressed left and right edge portions for each television line. The solid-state imager includes photosensitive picture elements... | 07/28/1987 |
| 4682233 | Video output signal clamping circuit In a wideband video signal processing system, a video signal is capacitively coupled to a kinescope via a signal path. A video signal clamping diode is coupled from the video signal path to a low impedance point in a feedback path of a keyed switching tra... | 07/21/1987 |
| 4680632 | Television display system with flicker reduction processor having burst locked clock and skew correction A speed-up memory doubles the field rate of a video input signal by repeating each field to reduce flicker when the double field rate signal is displayed. Read/write clocks for controlling the memory are locked to the color subcarrier of the video input s... | 07/14/1987 |
| 4677462 | Delay and filter network with chrominance trap between series input resistors In a luminance channel of a color television receiver, a luminance signal is conveyed to the input of a delay line via first and second series connected source resistors. A series tuned trap tuned to the chrominance subcarrier frequency is coupled between... | 06/30/1987 |
| 4677484 | Stabilizing arrangement for on-screen display A television receiver includes apparatus for stabilizing an on-screen character display by which the deflection signal source is controlled for operating in a free-running mode, substantially unaffected by signal variations on the sync input line, rather ... | 06/30/1987 |
| 4677482 | Dual mode progressive scan system with automatic mode switching by image analysis The line rate of a video input signal is doubled for display in progressive scan fashion by dual mode processor which generates added lines for the display by interpolation when displaying normal television pictures and by replication (repeating lines) wh... | 06/30/1987 |
| 4677467 | CATV addressable converter with multi-purpose, bi-directional serial digital data port A CATV addressable converter is provided with a multi-purpose bi-directional data port for transmitting and/or receiving serial digital data. A micro-computer provided within the converter is programmed to make the converter responsive to RF commands tran... | 06/30/1987 |
| 4677491 | Sample and hold circuit for a control system in a video signal processor A video signal processing and display system includes apparatus for automatically controlling the bias of an image display device. A sample and hold network of the control apparatus includes an amplifier, a switch and a storage capacitor. During sampling ... | 06/30/1987 |
| 4677483 | Interpolation filter with motion compensation A progressive scan receiver includes a frame interpolation filter for generating added lines for display in a given field from a video input signal by interpolation from corresponding elements of immediately preceding and following fields. A second filter... | 06/30/1987 |
| 4673978 | Progressive scan processor with plural frequency band interpolation A speed-up circuit time compresses and interlaces field delayed and interpolated lines of a video input signal for display in progressive scan fashion. The interpolated lines are produced by adding low and high frequency components derived from the video ... | 06/16/1987 |
| 4672445 | Progressive scan processor employing interpolation in luminance channel controlled by a motion signal and a vertical detail representative signal A frame comb filter separates a luminance signal from a composite video input signal for display on every other line of a progressively scanned display. The filter includes a tap for providing a field delayed luma signal and an interpolator for providing ... | 06/09/1987 |
| 4672443 | Compatible wide screen television system with image compressor/expander A wide aspect ratio television system includes memories for storing and recovering a video input signal in response to read and write clock pulses, respectively. Write clock pulses are deleted to compress edge regions of a wide aspect ratio input signal a... | 06/09/1987 |
| 4670904 | System for processing a scrambled video signal A television receiver receives a scrambled television signal with a suppressed sync pulse which is restored by a decoder coupled to the receiver. The receiver also includes a noise inverter which alters blanking interval noise pulses below a threshold lev... | 06/02/1987 |
| 4663659 | Video signal scrambling system employing full line reversal and double burst coding A memory reverses the sequence of samples of selected lines of a composite video input signal without separating the color burst and chrominance components of the lines thereby preserving chroma-burst phase integrity of scrambled lines. A burst inserter a... | 05/05/1987 |
| 4661851 | Apparatus for reducing the effect of noise interference in audio companding system A companding system for a television audio apparatus includes a compressor and an expander for stereo difference or second audio program signals. The compressor provides variable preemphasis of high frequency signal components and the expander provides co... | 04/28/1987 |
| 4661862 | Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions A wide-aspect-ratio HDTV signal having 1600 luminance pixels/32 μS line and 980 lines/frame is data reduced by deleting odd pixels of each line of TV field #1 and even pixels of each line of TV field #2 to produce 800 pixels per line, and is further data... | 04/28/1987 |
| 4661850 | Progressive scan television system with interlaced inter-field sum and difference components A progressively scanned video signal is encoded into temporal sum and difference components for transmission. The sum signal is temporally filtered, decimated and time expended to be compatible with interlaced receivers. The difference signal, also tempor... | 04/28/1987 |
| 4660093 | Television receiver with delayed display In a color television receiver including a color kinescope and plural kinescope driver stages, a control circuit is included for inhibiting the operation of the driver stages for a short interval after the receiver is energized, particularly under "hot st... | 04/21/1987 |
| 4660088 | Quasi-parallel television if suitable for stereo sound reception A multiplier for multiplying the modulated sound and picture carriers to produce an intercarrier sound signal in a quasi-parallel sound channel of an IF section has a pair of anti-parallel connected diodes in a limiter for generating an amplitude limited ... | 04/21/1987 |
| 4660087 | Video signal processing system with offset sound trap A first sound filter in a video IF channel of a television receiver exhibits a null response at a frequency slightly less than the 41.25 MHz sound IF carrier signal frequency. A demodulated baseband video signal is filtered by a second sound filter which ... | 04/21/1987 |
| 4660085 | Television receiver responsive to plural video signals A television receiver is arranged to selectively display either information from a broadcast television signal, or information from an auxiliary video signal. The black image reference level associated with the broadcast signal information is sampled and ... | 04/21/1987 |
| 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 |
| 4660084 | Television receiver with selectable video input signals A television receiver is arranged to selectively display either information from a broadcast television signal or information from an auxiliary video signal, in accordance with the position of a switching network to which the signals are capacitively coup... | 04/21/1987 |
| 4656520 | Frame-transfer CCD imager with recirculating frame storage register A CCD imager of frame-storage type has a frame storage register operable as a recirculating serial memory. The output ends of the parallel charge transfer channels in the image register are separated from respective ones of the input ends of the parallel ... | 04/07/1987 |
| 4652920 | Video image blanking signal generator A video monitor includes apparatus for generating a horizontal blanking pulse accurately timed with respect to a horizontal image retrace interval. The leading edge of the blanking pulse is derived from a differentiated horizontal oscillator signal which ... | 03/24/1987 |
| 4647974 | Station signature system A system for the automatic insertion of auxiliary video information into a television signal received at a local station from a network distribution system is provided which inserts a trigger signal into the television signal before its distributed to the... | 03/03/1987 |
| 4644387 | Plural input television receiver having peaking circuit and chrominance band reject filter in a video signal channel A television receiver responsive to broadcast television signals in a normal operating mode includes a video channel with high frequency peaking circuits, followed by a wideband display driver to which auxiliary R, G, B color image signals are applied in ... | 02/17/1987 |
| 4644231 | Video data display driver stage In a video monitor for display alphanumeric data on a kinescope display screen, a kinescope driver transistor receives binary video data signals at a low impedance emitter input electrode and provides high level video data output signals to the kinescope ... | 02/17/1987 |
| 4642691 | Television signal input filter An input filter for coupling television signals from a signal source such as an antenna to an RF signal processing stage includes series resonant input and output sections shunting the signal path. The input section forms a trap at the video IF frequency.... | 02/10/1987 |
| 4642690 | Digital video signal processor with analog level control In a video signal processing and display system such as a television receiver employing digital video signal processing techniques, viewer generated control signals for normally controlling the brightness and/or contrast of a displayed image are utilized ... | 02/10/1987 |
