| 6859536 |
Video-signal output apparatus and video-signal input apparatus |
| Feb-22-2005 |
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 each... |
| 6570990 |
Method of protecting high definition video signal |
| May-27-2003 |
A system controls reproduction of a video transmission between a transmitter and a receiver. The system includes an encryptor with an offset generator adapted to receive the encrypted frame key and to... |
| 6226384 |
Method and device for providing controlled access video signals without providing a signal in the clear |
| May-1-2001 |
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 memory... |
| 6222926 |
Method and device for providing controlled access video signals without providing a signal in the clear |
| Apr-24-2001 |
A LCD display device for receiving encrypted video data and for decrypting the video data such that a signal is not provided "in the clear" before receipt by the display device. The video data is encrypted... |
| 6169584 |
Automatic modulation control of sync suppressed television signals |
| Jan-2-2001 |
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 signal is... |
| 5555305 |
Method and apparatus for secure transmission of video signals |
| Sep-10-1996 |
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 lines scrambled... |
| 5375168 |
Method for scrambling and unscrambling a video signal |
| Dec-20-1994 |
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 line in... |
| 5355409 |
Scramble codec and a television receiver incorporating the same |
| Oct-11-1994 |
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 data signals... |
| 5335275 |
Television scrambler |
| Aug-2-1994 |
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 information... |
| 5321748 |
Method and apparatus for television signal scrambling using block shuffling |
| Jun-14-1994 |
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 portions.... |
| 5249229 |
Device and method for generating control signals |
| Sep-28-1993 |
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) and read... |
| 5191609 |
Scrambling and unscrambling circuit |
| Mar-2-1993 |
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 pseudo-random address... |
| 5182771 |
Anti-taping method and apparatus for a multiplexed analog component television system |
| Jan-26-1993 |
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 number of... |
| 5161014 |
Neural networks as for video signal processing |
| Nov-3-1992 |
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 includes... |
| 5058158 |
Video scrambling apparatus and method based on space filling curves |
| Oct-15-1991 |
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 buffer.... |
| 5040211 |
Reliable television transmission through analog channels |
| Aug-13-1991 |
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 quality... |
| 5034981 |
Anti-copying video signal processing |
| Jul-23-1991 |
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 to... |
| 5003590 |
Encoding an optical video disc to inhibit video tape recording |
| Mar-26-1991 |
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 video... |
| 4916739 |
Adhesive photocopyable transparency for use in a secure facsimile transmission system |
| Apr-10-1990 |
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 complementary and... |
| 4914694 |
Modifying a television signal to inhibit recording/reproduction |
| Apr-3-1990 |
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 television... |
| 4910772 |
Video scrambling apparatus and method based on space filling curves |
| Mar-20-1990 |
A method of encrypting a video signal employing a pseudo-random Space Filling Curve having a highly irregular scanning pattern for scanning the pixel addresses of a video picture stored in a frame buffer.... |
| 4821321 |
Automatic secure transmission and reception of pictorial information |
| Apr-11-1989 |
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 added... |
| 4796298 |
Video display unit |
| Jan-3-1989 |
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 characters.... |
| 4669117 |
Video terminal with image line disarrangement |
| May-26-1987 |
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 his screen.... |
| 4663659 |
Video signal scrambling system employing full line reversal and double burst coding |
| May-5-1987 |
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... |
| 4633310 |
Method and device for secure transmission and of television pictures |
| Dec-30-1986 |
A process for scrambling and unscrambling video signals during transmission begins with a sampled line of video signals. The line is divided into adjacent segments, each of which has at least two samples.... |
| 4620224 |
Video scrambling technique for multiplexed analog component formats |
| Oct-28-1986 |
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 position... |
| 4533949 |
Subscription television system |
| Aug-6-1985 |
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 unscrambling... |
| 4488176 |
Method of and apparatus for modifying a video signal to inhibit recording thereof |
| Dec-11-1984 |
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 signal can... |
| 4390898 |
Scrambling and unscrambling video signals in a pay TV system |
| Jun-28-1983 |
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 intervals. This... |
| 3958077 |
Picture transmission systems |
| May-18-1976 |
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 conventional... |
