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7526707 |
Method and apparatus for encoding and decoding data using a pseudo-random interleaver
A pseudo-random bit interleaver and de-interleaver comprising a source for generating pseudo-random numbers and transformation logic that transforms each pseudo-random number generated by the...
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7302059 |
Star pattern partial encryption
A selective encryption encoder consistent with certain embodiments of the invention has a packet identifier that identifies packets of a specified packet type, the specified packet type being...
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7292690 |
Video scene change detection
A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video...
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7242773 |
Multiple partial encryption using retuning
A partial dual encryption encoder, consistent with certain embodiments of the present invention receives video from a source of an unencrypted digital video signal. A first segment of the...
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7221761 |
Error resilient digital video scrambling
A method and an apparatus for error resilient, digital image scrambling are disclosed. Error resilience scrambling is produced by shuffling transform coefficients between arrays of coefficients...
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7155012 |
Slice mask and moat pattern partial encryption
A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video...
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7046806 |
Information recording apparatus and method, and information reproduction apparatus and method
As an example of this invention, user data which is broken up into sectors and is scrambled for each sector using a randomly generated scramble pattern, and scramble pattern data for specifying the...
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6859536 |
Video-signal output apparatus and video-signal input apparatus
A video-signal output apparatus performs scrambling, and a video-signal input apparatus performs descrambling. The scrambling and the descrambling are performed so that signal lines are shifted for...
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6226384 |
Method and device for providing controlled access video signals without providing a signal in the clear
A display device for receiving encrypted or scramble video data and for decrypting or descrambling the video data such that a signal is not provided "in the clear". The video data is stored in a...
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6169584 |
Automatic modulation control of sync suppressed television signals
The depth of modulation and the absolute RF carrier level of an amplitude-modulated video signal are automatically adjusted. For adjustment of the depth of modulation, a sync tip of the video...
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5555305 |
Method and apparatus for secure transmission of video signals
Video signals are sampled at 4Fsc locked onto sub-carrier phase and frequency. The active picture lines of each field are divided into 6 blocks of 47 lines and the active line periods of those...
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5375168 |
Method for scrambling and unscrambling a video signal
A scrambling method wherein each image line (23-309) of a frame having been produced in unscrambled form before being scrambled, is given the pseudorandomly determined address (B) of the memory...
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5355409 |
Scramble codec and a television receiver incorporating the same
A scramble codec comprises a latch means for holding an ID number for securing television or other communication data, a pair of memories which can be alternately loaded with input communication...
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5335275 |
Television scrambler
A video encryption/decryption system in which lines of video information are stored in digitised form in a block of RAM memory, and are typically shuffled in groups of 32 lines by pivot reading...
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5321748 |
Method and apparatus for television signal scrambling using block shuffling
A method and apparatus for scrambling video signals to obtain the secure transmission of video information. A block of video lines in a television raster is divided into top and bottom sub-block...
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5249229 |
Device and method for generating control signals
A device and to a method for generating control signals is set forth. The device according to the present invention allows the generation, from a single time reference, of the write control (WE)...
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5191609 |
Scrambling and unscrambling circuit
There is disclosed a circuit for scrambling an input signal, which has a pseudo-random address generator to detect a synchronizing signal from the input signal and to generate therefrom...
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5182771 |
Anti-taping method and apparatus for a multiplexed analog component television system
An apparatus for transmitting a multiplexed analog component television signal. The apparatus includes a signal source generator for generating a signal source having information regarding the...
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5161014 |
Neural networks as for video signal processing
A television signal processing apparatus includes at least one neural network for processing a signal representing an image. The neural network includes a plurality of perceptrons each of which...
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5058158 |
Video scrambling apparatus and method based on space filling curves
A method of encrypting a video signal employing a pseudorandom Space Filling Curve having a highly irregular scanning pattern for scanning the pixel addresses of a video picture stored in a frame...
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5040211 |
Reliable television transmission through analog channels
The presence of random noise, interference, multipath, and imperfect frequency response in terrestrial broadcasting channels, and of pervasive low-level reflections in cable systems, degrades the...
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5034981 |
Anti-copying video signal processing
Counting circuitry in the vertical synchronizing circuit of a video receiver is prevented from generating vertical control signals at a fixed, standard periodicity when the video signal transmitted...
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5003590 |
Encoding an optical video disc to inhibit video tape recording
A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a...
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4916739 |
Adhesive photocopyable transparency for use in a secure facsimile transmission system
An adhesive photocopyable transparency for use in a secure facsimile transmission system wherein one of two partial documents each containing portions of an original document which are...
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4914694 |
Modifying a television signal to inhibit recording/reproduction
A composite television signal is modified to inhibit the reproduction of an unauthorized recording thereof by conventional video recorders but enable the display of a video picture therefrom on a...
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4821321 |
Automatic secure transmission and reception of pictorial information
A real time coding system for the transmission and reception of pictorial o-dimensional information at television (TV) rates. In one coding system, the input signal and a coding signal are modulo...
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4796298 |
Video display unit
A video display unit is described in which the display is divided into segments, and the order of scanning within each segment is scrambled. A segment may consist, for example, of a row or...
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4669117 |
Video terminal with image line disarrangement
Video terminal comprising electronic circuit provisions due to which the user of this terminal is protected against unwanted "remote looking-in" by other persons at the information reproduced on...
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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...
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4620224 |
Video scrambling technique for multiplexed analog component formats
A method for scrambling a television signal for use with a multiplexed analog component (MAC) format employs a three digital bit code for each horizontal line of the picture. The bits identify the...
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4533949 |
Subscription television system
In a subscription television system, only a video signal for a specific program is scrambled in a television signal in accordance with a predetermined scrambling mode. A key signal, used for...
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4488176 |
Method of and apparatus for modifying a video signal to inhibit recording thereof
Video signal lines are added to or omitted from the ends of individual fields of a video signal to produce a modified video signal whose field length varies at a slow rate. The modified video...
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4405942 |
Method and system for secure transmission and reception of video information, particularly for television
A method and a system for secure transmission and reception of a video signal wherein parts of the video signal arranged in a first predetermined sequence are delayed in relation to each other to...
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4390898 |
Scrambling and unscrambling video signals in a pay TV system
A scrambler scrambles a video signal by replacing its vertical intervals with dummy video signal lines, and separately providing information relating to the timing of the replaced vertical...
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3958077 |
Picture transmission systems
In a television or other picture transmission the picture is scanned in a random or pseudo-random manner enabling picture analysis and transmission within band widths considerably smaller than with...
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3379825 |
Subscription television system having raster distortion
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3065294 |
Television system for high definition and secrecy of image
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2994739 |
Subscription television receiver and method of operating the same
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2948779 |
Scrambling system
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2940005 |
Variable discontinuous interlaced scanning system
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2879324 |
Video scrambling and unscrambling system
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2875269 |
Video scrambling and unscrambling system
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2857553 |
Spiral sweep generator
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2846497 |
Television systems
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