| 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... |
| 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... |
| 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... |
| 5239582 |
Ramp generation for preventing transitions with infinite short rise time in a video scrambling system |
| Aug-24-1993 |
A method and apparatus for generating a ramp at cutpoints in a cut and rotate video line scrambling system. The undesirable shortening of the active portion of the video line which typically occurs in... |
| 5206907 |
Television signal scrambling method and apparatus |
| Apr-27-1993 |
A video signal from a video-audio source is converted to a digital signal, and stored in a memory. A read clock or a write clock for the memory is temporarily suspended to elongate or shorten a corresponding... |
| 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... |
| 5177786 |
Method and apparatus for scrambling/descrambling a video signal |
| Jan-5-1993 |
A method and an apparatus for scrambling and descrambling a composite video signal. The method comprises the steps of multiplying a digitalized composite video signal by a transform matrix of a predetermined... |
| 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... |
| 5136641 |
Scrambled video digital transmission link |
| Aug-4-1992 |
A scrambled video digital transmission link comprising an amplitude modulator, a scrambler, an amplitude demodulator and frequency conversion apparatus for providing a scrambled video signal in a baseband... |
| 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... |
| 4972473 |
Data communication method and apparatus using neural-networks |
| Nov-20-1990 |
A data communication apparatus comprises: means for dividing data to be transmitted into a plurality of blocks and extracting the data from each block; a first multi-layered neural network of three or... |
| 4964162 |
Secure television signal encoding and decoding system |
| Oct-16-1990 |
A television signal encoding and decoding system providing a line-spin scrambled video signal with substantially reduced amplitude gaps and line tilt and a digitally-encrypted audio signal that can be... |
| 4916736 |
Method and apparatus for encrypting and decrypting time domain signals |
| Apr-10-1990 |
Time sequential information signals, such as color video signals having a line timing reference and an active video portion, are encrypted by time shifting the active video signal portion towards and away... |
| 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... |
| 4796299 |
Video encoder apparatus |
| Jan-3-1989 |
A line rotation encoder for use with cable or pay television systems includes a storage unit having a storage capacity large enough to store only a single digitized video horizontal line of information,... |
| 4777648 |
Line tilt compensation method and apparatus |
| Oct-11-1988 |
An improved technique for removing line tilt and other types of line rate correlated noise interjected into the active portions of a video signal during transmission and reception of the video signal.... |
| 4736420 |
Video scrambling by segmenting video information lines |
| Apr-5-1988 |
A system for scrambling a video signal having a plurality of horizontal lines, each of which includes a video information portion and a non-video information portion. The scrambling system includes a memory;... |
| 4731839 |
Method for coding and de-coding audio and video information |
| Mar-15-1988 |
There is described a method for coding and de-coding in an information-transmission system, particularly for pay-television, which comprises for coding, converting the input analog signal into a digital... |
| 4694489 |
Video transmission system |
| Sep-15-1987 |
A subscriber cable television system uses predominantly digital signal processing techniques and has extremely high security and an increased capacity for transmitting program and customer data to individual... |
| 4682360 |
Video transmission system |
| Jul-21-1987 |
A subscriber cable television system uses predominantly digital signal processing techniques and has extremely high security and an increased capacity for transmitting program and customer data to individual... |
| 4680791 |
Digital video signal process apparatus for use in a video tape recorder |
| Jul-14-1987 |
A processing apparatus for producing a recording signal from a video signal is disclosed. The video signal is coded to include a plurality of sub-blocks, each of the sub-blocks including a synchronizing... |
| 4654704 |
Analog television with regenerable and encryptable signals |
| Mar-31-1987 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NISC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 4646147 |
Method and apparatus for scrambling and unscrambling television signals |
| Feb-24-1987 |
Even though television signals are transmitted as analog signals over cable from the transmitter to the receivers of customers of the cable system, programs for which charges to the customers are payable... |
| 4630034 |
Sampling frequency converting apparatus |
| Dec-16-1986 |
A sampling frequency converting apparatus converts an input digital television signal which is sampled at a first frequency into an output digital signal which is sampled at a second frequency. The apparatus... |
| 4617597 |
Compatible color television with regenerable signals |
| Oct-14-1986 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NTSC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 4602283 |
System for spatially and temporally transposing data words arrayed in periodically recurring patterns |
| Jul-22-1986 |
A train of incoming data words, specifically digitized video samples arrayed in frames of Y lines of X pixels each which have already undergone a 2-dimensional spatial transformation, is scrambled by being... |
| 4568966 |
Compatible color television with regenerable signals |
| Feb-4-1986 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NTSC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 4563702 |
Video signal scrambling and descrambling systems |
| Jan-7-1986 |
Systems for scrambling and descrambling video information lines. The scrambling system includes a memory; a storage system for sequentially storing groups of four video information lines in the memory;... |
| 4534037 |
Method and apparatus for scrambled pulse-code modulation transmission or recording |
| Aug-6-1985 |
In order to emphasize particular spectral components of a sequence of digital signals transmitted or recorded in pulse-code words, "repacketed" words made up of one or more bits of one word of the original... |
| 4531020 |
Multi-layer encryption system for the broadcast of encrypted information |
| Jul-23-1985 |
A method of controlling the simultaneous broadcast of enciphered digital information signals, for example in a radio or television broadcast environment, to a plurality of subscribers provides several... |
| 4392021 |
Secure facsimile transmission system using time-delay modulation |
| Jul-5-1983 |
Method and apparatus for secure transmission of analog signals, particularly facsimile signals. The analog signal is first converted to a frequency-modulated signal, if not already one, and is then converted... |
| 4386416 |
Data compression, encryption, and in-line transmission system |
| May-31-1983 |
An in-line data compression system which reduces the number of binary bits required to transmit a given text or similar message over a data network such as Telex or TWX. The compression unit can transmit... |
| 4295223 |
Digital signal/noise ratio amplifier apparatus for a communication system |
| Oct-13-1981 |
The signal-to-noise ratio of a signal to be transmitted through a communication channel having an upper and lower limit in magnitude is sampled digitally and a common corrective factor for the deviations... |
| 4070693 |
Secure television transmission system |
| Jan-24-1978 |
A system for transmitting a secure television image is as disclosed. At the transmitter each line of the television image is digitized to generate a series of digital numbers representing the complete... |
