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| Number | Title | Issue Date |
| 7372975 | Method for secure background modeling in images A method processes a sequence of input images securely. A sequence of input images are acquired in a client. Pixels in each input image are permuted randomly according to a permutation π to generate a permuted image for each input image. Each permuted image is tran... | 05/13/2008 |
| 7324646 | Method and apparatus for film anti-piracy A method and apparatus is disclosed for introducing alterations or distortions in projected images. The distortions on the projected image are imperceptible to a human viewer. The distortions are recorded on recording devices and observable upon viewing the recorded... | 01/29/2008 |
| 7230454 | Serial audio output driver circuits and methods An output driver circuit including a transistor for pulling down an output terminal voltage and a charge pump for driving an input of the transistor to pull-down the output terminal voltage substantially to zero volts in response to a selected level of an input sign... | 06/12/2007 |
| 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 arranged along an axis substantially orthogonal to the axis along which ... | 05/22/2007 |
| 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 of a VSYNC signal once the blanking interval has started. ... | 05/15/2007 |
| 7146008 | Conditional access television sound A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improp... | 12/05/2006 |
| 7139397 | Hybrid architecture for realizing a random numbers generator A hybrid architecture for realizing a random numbers generator comprising a digital circuitry portion able to provide for a random bytes sequence as well as an analog circuitry portion able to provide a seed of the true random type is described. ... | 11/21/2006 |
| 7082414 | Image encrypting method and device, image decrypting method and device, and recording medium When image date has been decomposed into a plurality of components, and a plurality of components of the components have been encrypted, the encrypted image file must be able to be used without confusion. On a component decomposing means, image data is decomposed in... | 07/25/2006 |
| 7043211 | Universal modulator A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a fi... | 05/09/2006 |
| 6976265 | Method and apparatus for controlling display of content signals A method and apparatus for controlling display of content signals begins by receiving a content signal that includes video content and at least one associated content control indicator. The content signal may also include audio content associated with the video cont... | 12/13/2005 |
| 6950602 | Digital data reproducing and recording apparatus creating latent deterioration In a digital data processing apparatus, a storage section stores data representative of digital contents of audio or video. A reproduction section processes the data to reproduce the digital contents. A reading section reads out the data from the storage section and... | 09/27/2005 |
| 6950520 | Method and apparatus for carrying data in a video signal so that the data is not recorded A method and apparatus for modifying a video signal to allow it to carry encoded data which is detectable at a suitably compliant receiver but is not recorded by a conventional video recorder. One application is to carry a descrambling key to prevent useful recordin... | 09/27/2005 |
| 6947560 | Method and device for effective key length control The present invention includes a method and device for calculating an encryption key, K′c, for use in the initialization of an encryption algorithm. The present invention discloses a method for calculating the encryption key, K′c(x), by obt... | 09/20/2005 |
| 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 to generate a sequence of pseudo-random values for the color compone... | 08/02/2005 |
| 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 still recognizable, or otherwise provided at a desired quality... | 05/03/2005 |
| 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 each period corresponding to one horizontal scanning interval of ana... | 02/22/2005 |
| 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 split back into a serial stream of bits.... | 06/18/2002 |
| 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 invention changes the combination of modes used as time p... | 09/29/1998 |
| 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 terminals connected to receive analog signal samples from said s... | 01/28/1997 |
| 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 a decoding apparatus (20), an identification code that spe... | 11/26/1996 |
| 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 authentication messages to which a correct response can be... | 10/08/1996 |
| 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 video line, thus providing both security and concealment. The ... | 04/02/1996 |
| 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 address generating circuit. Scrambling is effected by executin... | 01/30/1996 |
| 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 written for each horizontal scan line, a nonlinear feedback ... | 10/03/1995 |
| 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 "seed" value. The seed is processed to provide both identity in... | 09/19/1995 |
| 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 the scramble system according to the present invention is ... | 04/25/1995 |
| 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 portions. The top and bottom sub-block portions are switched... | 06/14/1994 |
| 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 in cut and rotate scrambling to overcome the problem of a... | 08/24/1993 |
| 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 crypted and corresponding to a control word periodically loa... | 06/29/1993 |
| 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 descrambling of video signals recorded on videotape record... | 05/18/1993 |
| 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 line is sampled, an error signal is produced from the diffe... | 05/11/1993 |
| 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 out using a chip card reader whose chip card comprises encod... | 05/04/1993 |
| 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 start of the second section.... | 04/20/1993 |
| 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 pseudo-random address and sequential address. The inventive circuit h... | 03/02/1993 |
| 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.... | 01/05/1993 |
| 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 (card pay-television) is associated with the microprocessor, ... | 09/01/1992 |
| 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 least a part of said extension signal or signals, and rece... | 09/03/1991 |
| 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 pair of scrambled video information lines by retrieving from... | 05/07/1991 |
| 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 be transmitted within the bandwidth limitations of a conv... | 10/16/1990 |
| 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, with a modest amount of complexity and cost. However, line ... | 08/21/1990 |
