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| Number | Title | Issue Date |
| 5235423 | Controllable pseudo random noise pattern generator for use in video special effects A pseudo-random pattern generator has modifiable feedback so that a variety of pseudo-random video patterns can be generated and used either directly, or after further manipulation, to control the mixing of two video sources. Control of a multiplexer allo... | 08/10/1993 |
| 4949177 | Method and apparatus for carrying out a non-linear operation on a digital signal A digital input signal having a sampling frequency f is interpolated by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated. A non-linear operation is carried out on the first digital signa... | 08/14/1990 |
| 4947255 | Video luminance self keyer An improved luminance video self keyer extracts a key signal from an unshaped input video signal as a function of a low and a high clip level. The input video signal is subsequently "shaped" as a function of the key signal and the low clip level. The resu... | 08/07/1990 |
| 4947097 | Automatic switching of motion control with tactile feedback A rotary control knob is adapted to provide for automatic switching between two modes of movement control for a tape transport. An insulative ring surrounds a conductive knob, and the conductive knob is electrically connected to an oscillator circuit. Cha... | 08/07/1990 |
| 4875097 | Perspective processing of a video signal A video signal representing a scene is processed by combining it with a second signal having a value which depends on the depth of the scene as a function of position.... | 10/17/1989 |
| 4859955 | Apparatus for smoothing an abrupt change in signal level An apparatus for smoothing an abrupt change in signal level generates a control signal having a curvilinear ramp shape. An amplifier has a step input signal applied to a non-inverting input, a delayed slope control signal applied to a bias terminal, and t... | 08/22/1989 |
| 4853784 | Video switcher with independent processing of selected video signals A video switcher comprises a source selector having a plurality of input terminals for connection to a plurality of video sources respectively, and at least two output terminals. At least two processing channels each have an input terminal connected to an... | 08/01/1989 |
| 4851912 | Apparatus for combining video signals A first shaped video signal V1 K1 and a second shaped video signal V2 V2, are combined so as to generate a third shaped video signal V3 ' given by where P12 is a priority signal. A key signal K | 07/25/1989 |
| 4852035 | Simple coefficient half-bandwidth digital filter for video data compression A digital data rate compression system accepts an input digital signal having a plurality of samples at a given rate and outputs a digital signal at one-half of the given rate, or as an expansion system outputs a digital signal at twice the given rate. Th... | 07/25/1989 |
| 4846705 | Backplan connector Electrical apparatus comprises a backplane board of dielectric material and at least one run of conductive material. An aperture extends through the dielectric material and through the run of conductive material. A conductor member may be connected to the... | 07/11/1989 |
| 4843469 | Rapid signal acquisition and phase averaged horizontal timing from composite sync A circuit for extracting phase averaged horizontal timing with high noise immunity and for rapidly acquiring a video signal from a composite synchronizing signal generates an output signal at the horizontal sync rate, the output signal having leading edge... | 06/27/1989 |
| 4835613 | Transition status display for video switcher A transition status display for a video switcher inserts a single, readable synopsis of a next transition event into a video output signal from the video switcher for display on a monitor. The synopsis is in the form of a window having a line segment repr... | 05/30/1989 |
| 4831447 | Method and apparatus for anti-aliasing an image boundary during video special effects A method of processing a foreground array of sample values, a background array of sample values and a crop array of sample values, which three arrays are coextensive and wherein the crop array represents a geometrical figure associated with a non-zero mul... | 05/16/1989 |
| 4826450 | Centering sleeve for coaxial connectors A centering sleeve for minimizing angular displacement of an electrical connector within a connector block has an internal hole adapted to fit closely onto the electrical connector and an external surface adapted to fit snugly within a hole in the connect... | 05/02/1989 |
| 4823183 | Video mixer with multicolor boarder Video effects apparatus comprises a wipe generator for generating a wipe signal and a matte generator for generating a matte signal. The matte generator receives the wipe signal and the color represented by the matte signal is dependent on the wipe signal... | 04/18/1989 |
| 4821269 | Diagnostic system for a digital signal processor A diagnostic system for a digital signal processor, having an input module, an output module and a plurality of successive processing modules defining a signal processing path, monitors various internal test points within each module. Any one of the test ... | 04/11/1989 |
| 4811102 | Hybrid wipe generator Video special effects apparatus comprises both an analog pattern generator and a digital pattern generator. The analog control signal generated by the analog pattern generator and the digital control signal generated by the digital pattern generator are c... | 03/07/1989 |
| 4811264 | Numerical precorrection technique A numerical precorrection technique for modifying a digital signal corresponding to a desired analog signal to compensate for the characteristics of an analog filter which processes the digital signal after it is converted from digital to analog converts ... | 03/07/1989 |
| 4809070 | Method and apparatus for adding texturing highlights to a video signal The central difference along a selected axis through a point (u, v) of a rectangularly-sampled luminance field and at an arbitrary angle is computed by interpolation. The octant in which the selected axis lies is identified, and first and second p... | 02/28/1989 |
| 4805022 | Digital wipe generator A digital wipe generator has a digital waveform generator to generate X and Y digital waveforms from a composite sync signal. A digital wipe solid generator processes the X and Y digital waveforms to produce a digital wipe solid waveform. The wipe solid g... | 02/14/1989 |
| 4800432 | Video Difference key generator A video difference key generator has a stored reference video image. An input video image is compared with the reference video image by an absolute difference circuit which substracts corresponding pixels of the two video images, the smaller from the larg... | 01/24/1989 |
| 4799026 | Multifunction amplifier A multifunction amplifier uses a finite transconductance amplifier to provide an amplifier with a high impedance input and a desired output impedance. A pair of appropriate polarity binary signals are summed to form a ternary signal which may be filtered ... | 01/17/1989 |
| 4797836 | Image orientation and animation using quaternions A method for orientating and animating video images using quaternions to provide smooth, predictable rotations in a digital video effect device. Euler angles for a new orientation are input by an operator and are converted into an appropriate quaternion. ... | 01/10/1989 |
| 4795916 | Low power differential ECL line driver A low power, differential ECL line driver has a switching network that applies a constant current source as the emitter load to only one of the output transistors at a time while applying a constant current source to the base of the other output transisto... | 01/03/1989 |
| 4791483 | Adaptive differential pulse code modulation video encoder An adaptive DCPM video encoder operates directly upon a digitized composite video signal to generate a bit reduced serial digital output signal. The encoder has a feed back loop in the form of a recursive filter with zero's at d.c. and the color subcarrie... | 12/13/1988 |
| 4782388 | Method and apparatus for providing video mosaic effects A video signal is used to create a mosaic effect by carrying out a first sample and hold operation on the video signal so as to generate a second video signal, rotating the effective scanning direction of the second video signal through a predetermined an... | 11/01/1988 |
| 4780763 | Video special effects apparatus A wipe-only effects apparatus has a video mixer with video input terminals for receiving respective input video signals. The mixer combines the input video signals in dependence upon a control signal received at a control input terminal of the mixer. A ra... | 10/25/1988 |
| 4771192 | Digital clip and gain circuit A digital clip and gain circuit compares an input waveform with a clip level to produce a difference waveform. The difference waveform is shifted by an exponent representing a power of two portion of a gain value, and is then multiplied by a mantissa repr... | 09/13/1988 |
| 4769692 | Method and apparatus for calibrating the phase of a video signal The color burst of a first video signal is brought into a desired phase relationship with the color burst of a second video signal by generating a first number which is representative of the phase relationship between the burst of the second video signal ... | 09/06/1988 |
| 4763341 | Digital timing using a state machine A digital timing generator using a state machine detects the presence of a predetermined pulse pattern at the input to generate a valid pulse output, and from the periodic repetition of the valid pulse output indicates the presence or absence of an input ... | 08/09/1988 |
| 4758880 | Video matte generator A matte generator for generating a video signal representative of a matte having a uniform color, has an operator interface for generating signals representing three independent variables which are sufficient to characterize a color. A processor receives ... | 07/19/1988 |
| 4758890 | Quantizing television horizontal phase to subcarrier zero crossings A circuit for quantizing television horizontal phase to subcarrier zero crossings has a voltage variable delay circuit to delay the leading edges of incoming horizontal pulses to produce a delayed horizontal pulse output. The corresponding leading edges o... | 07/19/1988 |
| 4757508 | Tracking modulation limiter for lasers A tracking modulation limiter for laser diodes tracks from the output of a laser diode the maximum forward current. The maximum forward current is multiplied by a factor less than one to generate a control current representative of the maximum negative mo... | 07/12/1988 |
| 4752826 | Intra-field recursive interpolator An intra-field recursive interpolator reads stored output video from one field store while writing output video into a second field store. The read stored output video is spatially corrected by vertical interpolation prior to being multiplied by a decay c... | 06/21/1988 |
| 4750167 | Digital audio transmission system A digital audio transmission system which is compatible with common carrier digital hierarchy systems converts two channels of analog data, such as precision stereo audio, into high resolution digital data words sampled at a high frequency. The data words... | 06/07/1988 |
| 4743958 | Multiple television standards input selector and convertor A multiple television standards input selector and convertor selects a video signal from among a plurality of television standard format input sources including encoded video, analog component video and digital video. The selected video signal is converte... | 05/10/1988 |
| 4743970 | Picture transformation memory A picture transformation memory has three field stores which rotatively store a next field of video data, output a prior field of video data and output a current field of video data to provide a full frame output for each field input period. Each field st... | 05/10/1988 |
| 4703447 | Mixer controlled variable passband finite impulse response filter A mixer controlled, variable passband, finite impulse response filter has a plurality of individual filter function blocks which are cascaded. The filter function of each of the individual filter function blocks is represented by a fixed filter function b... | 10/27/1987 |
| 4698666 | Video key glow and border generator A method and apparatus is disclosed which provides for the placement of a border video signal around a selected object in a video image. A video image of the selected object is first inserted into a video image of a selected border video signal in a video... | 10/06/1987 |
| 4689682 | Method and apparatus for carrying out television special effects An output video signal is derived from an input video signal by writing the input video signal into a frame buffer, generating a sequence of address words, modifying the sequence of address words, and using the modified sequence of address words to read t... | 08/25/1987 |
