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7584511 |
Data processing apparatus, data processing method, program, program recording medium, data recording medium, and data structure
At step S 372 , permission information about video data that are being reproduced is obtained from permission information that represents whether video data corresponding to encoded video data...
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7218737 |
System and method for an adaptive state machine to control signal filtering in a serial link
A method for adaptively filtering a control signal in a serial link includes monitoring for a blanking interval in a video stream having an associated clock signal and monitoring for an occurrence...
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6925181 |
Method of protecting high definition video signal
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...
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6888943 |
Multimedia adaptive scrambling system (MASS)
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...
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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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6408077 |
Descrambling device of a security element and security element comprising such a device
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...
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5815572 |
Video scrambling
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...
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5598472 |
Charge-coupled-device based all-analog wave form scrambling with applications in audio, video, video-on-demand, and TV systems
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...
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5579391 |
TV scramble system for preventing illegal reception
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...
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5563948 |
Process for authentication of smart cards, and device for use of the process
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...
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5504815 |
Method and apparatus for scrambling and descrambling
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...
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5488658 |
Video signal scrambling and descrambling apparatus
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...
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5455860 |
Scramble codec
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...
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5452357 |
Method and apparatus for access control and/or identification
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...
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5410601 |
Video scramble system and equipment
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...
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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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5239582 |
Ramp generation for preventing transitions with infinite short rise time in a video scrambling system
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...
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5224161 |
Method of scrambling and of unscrambling composite video signals, and device for implementation
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...
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5212723 |
Burst phase correction system for video descrambling
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...
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5210608 |
Method for the correction of television signals at transmission, and implementation device
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...
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5208856 |
Scrambling and unscrambling method for composite video signals and implementing device
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...
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5204898 |
Method of protection against the unauthorized unscrambling of scrambled television broadcasts, and implementation method
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...
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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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5177485 |
Method of scrambling PAL, SECAM and NTSC composite video signals and decoder of signals scrambled by this method
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.
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5144663 |
Method of interactive communication between a subscriber and a decoder of a system of pay-television and decoder thereof
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...
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5046091 |
Extended definition television transmission system
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...
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5014310 |
Video scrambling and descrambling by varying sequence of segments in adjacent video information lines
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...
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4964162 |
Secure television signal encoding and decoding system
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...
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4951314 |
Line tilt compensation method and apparatus
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,...
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4945564 |
Process for the scrambling and descrambling of television images
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...
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4864614 |
Authorising coded signals
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....
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4827510 |
Minimization of amplitude gaps in a line-spin scrambled video signal
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...
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4796299 |
Video encoder apparatus
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...
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4777648 |
Line tilt compensation method and apparatus
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...
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4757531 |
Encryption of television signals
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...
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4747138 |
Method of scrambling television pictures and arrangement for descrambling the pictures thus scrambled
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...
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4742544 |
Television transmission network with scrambling and descrambling
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...
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4742543 |
Video transmission system
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...
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4736420 |
Video scrambling by segmenting video information lines
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...
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4731837 |
Method and device for secure transmission and of television pictures
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...
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4727579 |
Scrambled television signals
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...
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4723282 |
Method and apparatus of decoding and deciphering a rotated video signal
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...
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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
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 i of points of cut...
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4673975 |
Television signal scrambling apparatus
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...
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4651205 |
Television transmission system
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...
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4649419 |
Pseudo-random binary sequency generator
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...
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4636854 |
Transmission system
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...
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4636851 |
Signal coding for secure transmission
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...
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4605961 |
Video transmission system using time-warp scrambling
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....
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4604650 |
Three line video scrambling method
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...
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