| 6925181 |
Method of protecting high definition video signal |
| Aug-2-2005 |
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... |
| 6888943 |
Multimedia adaptive scrambling system (MASS) |
| May-3-2005 |
A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable,... |
| 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... |
| 6408077 |
Descrambling device of a security element and security element comprising such a device |
| Jun-18-2002 |
In a device for descrambling scrambled digital data, the digital data are grouped into parallel combinations of bits before being descrambled. The combinations of bits are descrambled and then split back... |
| 5815572 |
Video scrambling |
| Sep-29-1998 |
A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention... |
| 5598472 |
Charge-coupled-device based all-analog wave form scrambling with applications in audio, video, video-on-demand, and TV systems |
| Jan-28-1997 |
A scrambled analog signalling system having a source of analog signals to be sent to a receiving device is comprised of a multiple stage charge coupled device (66) having analog signal input terminals... |
| 5579391 |
TV scramble system for preventing illegal reception |
| Nov-26-1996 |
A scramble system can effectively prevent a scrambled broadcast from being viewed illegally. In a scramble system in which a video signal scrambled by a scrambling apparatus (10) is descrambled by a decoding... |
| 5563948 |
Process for authentication of smart cards, and device for use of the process |
| Oct-8-1996 |
The device of the invention for a pay-television system comprises an emitter and several receivers using "smart cards". In addition to the unscrambling control signals, the emitter sends encrypted authentication... |
| 5504815 |
Method and apparatus for scrambling and descrambling |
| Apr-2-1996 |
A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line,... |
| 5488658 |
Video signal scrambling and descrambling apparatus |
| Jan-30-1996 |
A common circuit is used for scrambling and descrambling video signals. A memory stores key data. During scrambling the output of the memory is transmitted to a read address counter through an address... |
| 5455860 |
Scramble codec |
| Oct-3-1995 |
A scramble codec comprises a nonvolatile key data memory which holds a key data varying from one video recorder to another, a pair of line memories in which input picture signals are alternately written... |
| 5452357 |
Method and apparatus for access control and/or identification |
| Sep-19-1995 |
A system providing access control, including encryption and decryption capability, replaces a public key directory by a transmission between an authority, or a sender S, and a receiver R of a "seed" value.... |
| 5410601 |
Video scramble system and equipment |
| Apr-25-1995 |
The object of the present invention is to provide various scramble systems and equipments for embodying the scramble systems for omitting unqualified viewers in a pay TV system such as CATV. One of the... |
| 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.... |
| 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... |
| 5224161 |
Method of scrambling and of unscrambling composite video signals, and device for implementation |
| Jun-29-1993 |
In order to scramble as effectively as possible pay-television transmissions, the transmitter is made to transmit, at one and the same time, access messages and entitlement messages, all of them crypted... |
| 5212723 |
Burst phase correction system for video descrambling |
| May-18-1993 |
A method and apparatus for synchronizing a randomized video signal to a phase-locked sampling system. The phase-locked system is part of a scrambling apparatus capable of scrambling and subsequent descrambling... |
| 5210608 |
Method for the correction of television signals at transmission, and implementation device |
| May-11-1993 |
According to the disclosed method, a reference line is caused to be transmitted during the non-visible part of the image, the transmissions are received with a calibrated receiver, this reference line... |
| 5208856 |
Scrambling and unscrambling method for composite video signals and implementing device |
| May-4-1993 |
The method of the invention consists, during the transmission of composite video signals, in the inclusion therein of series of access messages (ECM1, ECM2) and, during the unscrambling, carried out using... |
| 5204898 |
Method of protection against the unauthorized unscrambling of scrambled television broadcasts, and implementation method |
| Apr-20-1993 |
According to the disclosed method, decoys which are the reproduction of the corresponding interpolated sequence are inserted into the scrambled line, at the end of the first section and at the start of... |
| 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... |
| 5177485 |
Method of scrambling PAL, SECAM and NTSC composite video signals and decoder of signals scrambled by this method |
| Jan-5-1993 |
The method of the invention consists in shifting (a) the start of the scrambled section of a composite video line of a television image with respect to the start of the useful part of that line. |
| 5144663 |
Method of interactive communication between a subscriber and a decoder of a system of pay-television and decoder thereof |
| Sep-1-1992 |
A decoder comprising a microprocessor connected to a receiver of data of teletext and to a text generator for displaying information on the screen of a television receiver. Further, a CPTV-card (card pay-television)... |
| 5046091 |
Extended definition television transmission system |
| Sep-3-1991 |
Television picture transmission stage in which besides means for transmitting at least one picture characteristic extension video signal via at least one transmission path, means for scrambling at least... |
| 5014310 |
Video scrambling and descrambling by varying sequence of segments in adjacent video information lines |
| May-7-1991 |
A video scrambling system scrambles adjacent sequentially odd and even video information lines of a video frame by simultaneously storing in a memory a pair of such adjacent lines; and forming a pair of... |
| 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... |
| 4951314 |
Line tilt compensation method and apparatus |
| Aug-21-1990 |
A method and apparatus that compensates for line tilt in a video line scrambled by a line spin scrambling technique. Line spin scrambling provides relatively secure transmission of video signals, with... |
| 4945564 |
Process for the scrambling and descrambling of television images |
| Jul-31-1990 |
The useful signal of a sampled video line is, at least partially, spliced to two adjacent segments (AB, BC), each of which has at least two states. The splicing point (B) between the two segments is synchronously... |
| 4864614 |
Authorising coded signals |
| Sep-5-1989 |
In a transmission system authorization codes are transmitted to authorize subscribers to receive scrambled signals in an intelligible manner, such a system being a television transmission system. If each... |
| 4827510 |
Minimization of amplitude gaps in a line-spin scrambled video signal |
| May-2-1989 |
A method and related apparatus for selectively line spin scrambling, reversing and inverting certain video lines or video segments to minimize amplitude gaps in a line-spin scrambled video signal and for... |
| 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.... |
| 4757531 |
Encryption of television signals |
| Jul-12-1988 |
A method of encrypting a television signal having in each ruster scan line a digital section of information and chrominance and luminance sections of information comprising cutting either or both of the... |
| 4747138 |
Method of scrambling television pictures and arrangement for descrambling the pictures thus scrambled |
| May-24-1988 |
Method of scrambling television pictures for which the video signals of each scanning line are of the M.A.C. type, that is to say time-division multiplexing of the analog chrominance and luminance components,... |
| 4742544 |
Television transmission network with scrambling and descrambling |
| May-3-1988 |
A controlled access television communications network in which scrambling and descrambling are accomplished by digital signal processing. At the scrambler, the video and audio information are digitized,... |
| 4742543 |
Video transmission system |
| May-3-1988 |
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... |
| 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;... |
| 4731837 |
Method and device for secure transmission and of television pictures |
| Mar-15-1988 |
A process for scrambling and unscrambling the image part of a sampled MAC ne video signal excluding the synchronization signal begins by dividing at two dividing points the MAC luminance signal and the... |
| 4727579 |
Scrambled television signals |
| Feb-23-1988 |
A television receiver for receiving scrambled television signals has an arrangement (3) which provides scrambled video components (V) and packet arranged sound/data components (D) some of which are also... |
| 4723282 |
Method and apparatus of decoding and deciphering a rotated video signal |
| Feb-2-1988 |
An arrangement for decoding and deciphering signals having been subjected to an encoding of the MAC type and to an enciphering by cyclic permutation at one point of cut, i.e. by cyclic permutation of the... |
| 4691352 |
Arrangement for deciphering and decoding television pictures encoded in accordance with the MAC standard and scrambled at transmission by submitting the video signals to cyclic permutations |
| Sep-1-1987 |
An arrangement for deciphering and decoding television pictures which were scrambled at transmission by submitting the video signals to cyclic permutations from the addresses x.sub.i of points of cut produced... |
| 4673975 |
Television signal scrambling apparatus |
| Jun-16-1987 |
A scrambling apparatus which scrambles a television signal prior to its transmission to prevent interception of the signal by means other than a counterpart descrambler apparatus. The television signal... |
| 4651205 |
Television transmission system |
| Mar-17-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 4649419 |
Pseudo-random binary sequency generator |
| Mar-10-1987 |
A pseudo-random binary address generator is described which is designed for supplying addresses of cutting points of video signals for the purpose of encoding these signals by rotation of the two segments... |
| 4636854 |
Transmission system |
| Jan-13-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 4636851 |
Signal coding for secure transmission |
| Jan-13-1987 |
A multiplexed analogue component (MAC) television signal is encrypted for transmission and reception by authorized recipients only by dividing the signal into blocks and reordering the blocks prior to... |
| 4605961 |
Video transmission system using time-warp scrambling |
| Aug-12-1986 |
A subscriber cable television system using predominantly digital signal processing techniques employs an improved time-warp and segment scrambling method for providing extremely high security. Means are... |
| 4604650 |
Three line video scrambling method |
| Aug-5-1986 |
The invention comprises a system for scrambling, transmitting and descrambling the video portion of a TV signal. In the preferred embodiment two serial memories (charge coupled devices) are utilized to... |
| 4600942 |
Secure coding and decoding system and method for television program signals |
| Jul-15-1986 |
Parts of a composite video signal, such as segments of each horizontal scan line, are stored in analog storage devices and retrieved therefrom in a cyclic manner to rearrange them and thereby encode the... |
| 4575754 |
Video scrambler system |
| Mar-11-1986 |
A video signal is scrambled by partitioning the signal into blocks of segments, reversing the sequence of segments in each block, randomly delaying the reversed segments and reversing the sequence of the... |
