Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 5696710 | Apparatus for symmetrically reducing N least significant bits of an M-bit digital signal An M-bit digital signal, the most significant bit (MSB) thereof and an integer K are added to produce a sum which is truncated by N least significant bits to provide a symmetrically rounded bit-reduced digital output signal. The MSB may be applied in true... | 12/09/1997 |
| 5680173 | Kinescope driver apparatus A complementary push-pull emitter follower amplifier is coupled between the output of a high voltage driver amplifier and the cathode of a kinescope for reducing the effective capacitance presented to the driver amplifier that is attributable to the kines... | 10/21/1997 |
| 5640119 | Method and apparatus providing high speed video signal limiting An input signal (IN) and a threshold signal (Vt) are coupled to an output terminal (2) via the base-emitter paths of first (Q1) and second (Q2) transistors having respective collector electrodes connected to a supply voltage source (3). The output termina... | 06/17/1997 |
| 5633689 | Apparatus for separating a digital composite video signal into components A digital filter (20,30) separates an M-bit (12) chrominance component (C12) from an N-bit (8) digital composite video signal (CV) supplied thereto, M (12) being greater than N (8) due to arithmetic operations (24,44,46,50) required for the separation. Th... | 05/27/1997 |
| 5585755 | Audio differential bus receiver for audio/video interconnection Audio bus receiver includes a pair of bipolar transistors each having a base coupled via a respective resistor to a respective bus receiver input terminal, each having an emitter that is diode coupled to a respective current source and each having a colle... | 12/17/1996 |
| 5574512 | Motion adaptive video noise reduction system A subtractor (106) forms a difference signal (D) from a video input signal (C) and a further signal (M) supplied thereto. The difference signal is limited (108) and attenuated (110) and the resultant signal (F) is combined (112) with the video input signa... | 11/12/1996 |
| 5563651 | Method and apparatus for identifying video fields produced by film sources employing 2-2 and 3-2 pull down sequences A binary number is generated representative of net motion during a field interval of an interlaced video signal from which a field to field difference signal is derived having a sign bit and a group of magnitude bits. The magnitude bits are compared with ... | 10/08/1996 |
| 5546130 | Method and apparatus for forming a video signal using motion estimation and signal paths with different interpolation processing Motion compensated video output signal (SO) produced by a soft switching or "fading" (SSW) between the a motion compensated interpolation (MCI) and a "fallback" mode (FFI) (e.g., intra-field), controlled by a "measure of confidence" (CF) in the reliabilit... | 08/13/1996 |
| 5539357 | Phase locked loop PLL apparatus for generating an oscillatory signal phase locked to a component of a further signal comprises a variable oscillator for generating the oscillatory signal and a source of the further signal. A phase detector responsive to the oscillatory sig... | 07/23/1996 |
| 5519455 | Kinescope driver with output load resistor coupled to kinescope cathode via two paths including a further resistor and a series coupled buffer amplifier and capacitor A current source (70) is coupled to supply an output current to a circuit node (60) proportional to a video input signal (R). A first resistor (65), coupled between the circuit node (60) and a source of supply voltage (68), develops an amplified video sig... | 05/21/1996 |
| 5519454 | Luma/chroma separation filter with common delay element for comb filter separation and recursive noise reduction of composite video input signal A composite video input signal is combined with a noise reduction signal to form a noise reduced first video signal which is delayed by multiple time periods of (i) one line less one-half color cycle, (ii) one line and (iii) one line plus one-half color c... | 05/21/1996 |
| 5517247 | Method and apparatus for converting a video input signal of progressive scan form to an interlaced video output signal of doubled field rate and employing progressive scan to progressive scan interpolation for reduction of visual artifacts Video signals of interlaced form are first converted to progressive scan (non-interlaced) form and then picture elements are generated that lie between the "progressive" picture elements and are interpolated by a vertical one-half (1/2) line shuffling by ... | 05/14/1996 |
| 5515309 | 1-bit adder and multiplier containing a 1-bit adder A one-bit adder includes a carry stage and an adding stage and is constructed in a fast CMOS complementary pass transistor logic with complementary analog CMOS switches in the adding stage which consist of a PMOS and an NMOS transistor. The source of the ... | 05/07/1996 |
| 5504531 | Method and apparatus for field rate up-conversion For improving motion portrayal and reducing undesirable artifacts, e.g., double images and "mouse teeth" structure, each pixel of intermediate fields in a field rate up-conversion system is determined from nearby pixels in the existing fields using an ada... | 04/02/1996 |
| 5491521 | Scan velocity modulation system with auxiliary vertical deflection towards bright side of video signal transitions A video signal is applied to a kinescope having scan velocity modulation for improving picture sharpness in the vertical direction. Pictures from video signals of a type having non-interpolated and vertically interpolated lines (e.g., interlace-progressiv... | 02/13/1996 |
| 5490094 | Method and apparatus for noise reduction A noisy input signal x is filtered with a restoration filter of median type to generate a filtered input signal y. The sum of the absolute differences between filtered and unfiltered signal is calculated for each position of a sliding window within the in... | 02/06/1996 |
| 5488417 | Automatic kinescope bias control system A controllable current source in an AKB circuit applies a measurement current to a kinescope driver amplifier during selected lines of the vertical interval of a video input signal to induce a beam current in a kinescope coupled to the driver amplifier. A... | 01/30/1996 |
| 5481311 | Method and apparatus for direction related interpolation For progressive scan conversion adjacent fields cannot be used to interpolate moving objects because motion blur will be introduced then. The most simple solution is to insert the average of the two adjacent lines for each missing line. A technique superi... | 01/02/1996 |
| 5473390 | Component to composite video signal converter circuit A bias source (R7,R8,C24) connected to a summing amplifier (Q1) produces a first DC bias at the amplifier input (emitter) and a second DC bias at the amplifier output (collector). A first circuit node (B) is AC coupled (22) to a luminance signal source (Y... | 12/05/1995 |
| 5455635 | Kinescope driver with gamma correction and brightness dependent capacitor coupling A video input signal is amplified and applied to the cathode of a kinescope via linear kinescope driver amplifier provided with an output impedance sufficiently high to impart gamma correction to images displayed by the kinescope but tending to diminish t... | 10/03/1995 |
| 5448311 | Tri-state video differential driver A differential current source (50) provides first and second complementary output currents (I1, I2) responsive to a video input signal (S1) which are coupled via respective load networks (52,54) to a common supply terminal (22) and develop first and secon... | 09/05/1995 |
| 5444493 | Method and apparatus for providing intra-field interpolation of video signals with adaptive weighting based on gradients of temporally adjacent fields Visual artifacts, normally characteristic of interpolated images, are minimized by a method of adaptive interpolation in which pixel values of a current line to be interpolated are determined from respective values of vertically adjacent pixels of adjacen... | 08/22/1995 |
| 5436667 | Multi-input television receiver with combined clamping and synchronizing signal separation circuit A television receiver embodying the invention includes a plurality of luminance signal sources, each capacitively coupled to an input of a luminance signal selection switch and each capacitor being coupled to a respective clamp circuit with each clamp cir... | 07/25/1995 |
| 5422680 | Non-linear contrast control apparatus with pixel distribution measurement for video display system A video signal to be processed is applied to a non-linear processor having an adjustable gain responsive to a control signal over at least one portion of the amplitude range of the video input signal. A sampling circuit, responsive to the video signal, ge... | 06/06/1995 |
| 5412436 | Motion adaptive video processing system A video source provides a temporally interpolated video signal, a spatially interpolated video signal and a motion indicating signal. A difference signal, derived from the temporally and spatially interpolated signals, is symmetrically limited as a functi... | 05/02/1995 |
| 5410222 | Sample pulse generator for automatic kinescope bias system Control circuitry, in an AKB sample pulse generator, enables charging of a capacitor upon initiation of a vertical retrace pulse, initiates discharge of the capacitor in response to termination of the retrace pulse and concurrently produces an AKB output ... | 04/25/1995 |
| 5389893 | Circuit for a controllable amplifier To improve the regulation (gain control) characteristics of a controllable amplifier, a negative feedback network in a differential amplifier is subdivided into individual networks supplied each with its own control current. In order to reduce distortion ... | 02/14/1995 |
| 5386237 | Method and apparatus for adaptive progressive scan conversion Extra lines (Yout) for display be progressive scanning are obtained by adaptive interpolation from the original (interlaced) lines. The original lines are left untouched. Each interpolated pixel is the result of a soft switch (456,461,462) between pure in... | 01/31/1995 |
| 5374962 | Multi-standard TV receiver with luma/chroma delay compensation A composite video input signal is delayed by a delay element and the delayed composite signal is applied to luminance and chrominance inputs of a picture processor for received signals of an NTSC format. For received signals of a PAL format, the delayed c... | 12/20/1994 |
| 5369446 | Video signal processor employing edge replacement, preshoots and overshoots for transient enhancement A video input signal is applied to a delay circuit having a plurality of taps which are coupled to maximum and minimum value selection circuits. In the absence of a video signal transient, the center tap of the delay circuit is coupled to an output termin... | 11/29/1994 |
| 5349389 | Video attenuator with output combined with signal from non-linear shunt branch to provide gamma correction and high frequency detail enhancement A video input signal is applied to a bridged-T attenuator which includes a non-linear element in the shunt branch thereof that provides increasing attenuation as the input signal increases to thereby produce a gamma corrected video output signal at the at... | 09/20/1994 |
| 5345267 | AKB apparatus with hot start flash prevention A receiver includes a kinescope, a driver amplifier and an integrated automatic kinescope bias (AKB) circuit. A soft start circuit includes a timing capacitor, external to the integrated circuit, and a control circuit within the integrated circuit which l... | 09/06/1994 |
| 5343255 | Video processing circuit with IF AGC loop, auxiliary video clamp and shared reference voltage source formed on common integrated circuit A clamp system for use in a television receiver having tuner and auxiliary video sources, comprises an IF AGC and video detector circuit having an AGC reference voltage input and an auxiliary video input signal clamp circuit having a reference voltage inp... | 08/30/1994 |
| 5339115 | Variable bandwidth luminance filter with commonly tuned delay and amplitude controlling filters providing frequency independent and bandwidth independent delay characteristic A luminance signal filter for use in a multi-source television receiver, includes a tunable filter responsive to a bandwidth control input signal for determining the bandwidth of luminance signals applied to said filter and a variable delay circuit invers... | 08/16/1994 |
| 5339114 | Television receiver with luminance signal clamped offset and re-clamped prior to contrast control for preventing black level changes with contrast control changes when displaying luminance signals having elevated black level A video input signal to be displayed is applied to an offset clamp circuit which effects a DC offset of blanking and active video portions of each video line. The DC offset or shift is of an amount and in a polarity sense to place the black level of the a... | 08/16/1994 |
| 5329314 | Method and apparatus for video signal interpolation and progressive scan conversion A video input signal is vertically interpolated and applied along with a field delayed and a field advanced video signal to respective inputs of a first median filter the output of which is applied along with a line delayed and a line advanced signal to r... | 07/12/1994 |
| 5317217 | Universal active filter A universal filter is provided with three inputs Vh, Vb and V1, with one output Vout, with two transconductance amplifiers Gm1, Gm2, with four capacitors mCO, (1-m)CO, CO and LCO and an amplifier K as well as a voltage follower VF. Depending on the connec... | 05/31/1994 |
| 5317240 | Kinescope driver apparatus with contrast enhancement A high voltage, inverting, kinescope driver amplifier is coupled at the input thereof to a source of low voltage video input signals to be amplified and is coupled at the output thereof for supplying amplified video output signals to the cathode of a kine... | 05/31/1994 |
| 5303048 | Circuit for synchronizing an on-screen display (OSD) on a picture screen In a television receiver, a source of super sandcastle pulse is connected via a horizontal sync signal extracting first circuit and the vertical sync signal extracting second circuit to the horizontal and vertical sync input terminals of an OSD processor.... | 04/12/1994 |
| 5300865 | Self adjusting blanking signal generator A scanning circuit which utilizes blanking pulses between flyback pulses in a display device includes a line blanking circuit which prevents the generation of spurious blanking pulses by ringing in the blanking pulses. The line blanking circuit includes a... | 04/05/1994 |
