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| Number | Title | Issue Date |
| 7352863 | Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on a illegal copy. The enhancement in one version include a negative going waveform that appears to the television receiver or videotape recorder to be a ... | 04/01/2008 |
| 7327222 | Transmission system for transmitting data via current conducting branches A system and method for transmitting and receiving data between a power supply and a remotely located load, by use of standard data communication cable has functional data transmitted via the power line of such data communication cable in order to decrease the numbe... | 02/05/2008 |
| 7298850 | Encrypting keypad module An encrypting keypad module (30) comprising a keypad (40) and an encryption unit (42) is described. The encryption unit (42) includes an interpreter (56) for receiving a file (150) containing data and instructions for proces... | 11/20/2007 |
| 7240366 | End-to-end authentication of session initiation protocol messages using certificates End-to-end authentication capability based on public-key certificates is combined with the Session Initiation Protocol (SIP) to allow a SIP node that receives a SIP request message to authenticate the sender of request. The SIP request message is sent with a digital... | 07/03/2007 |
| 7233670 | Signal tracing system and method A system and a method are for determining the origin of a signal received by a pay television subscriber in a given region. A system includes an encryption device located at a main operator, a transmission device adapted to transmit an encrypted video signal towards... | 06/19/2007 |
| 7215774 | Video data transfer control system and method A video data transfer control system allowing secure protection of video data from unauthorized copying is disclosed. A scrambling key used to scramble video data is stored in a key register and a new scrambling key is stored in a register. At the timing of a vertic... | 05/08/2007 |
| 7185362 | Method and apparatus for security in a data processing system Method and apparatus for secure transmissions. Each user is provided a registration key. A long-time updated broadcast key is encrypted using the registration key and provided periodically to a user. A short-time updated key is encrypted using the broadcast key and ... | 02/27/2007 |
| 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 |
| 7103105 | Data transmission protocol for image communication apparatus A communication method and data transmission protocol adapted to an image communication apparatus is provided. More particularly, this protocol provides a structure in which video, audio, and control data are multiplexed for communication, wherein loss of data other... | 09/05/2006 |
| 7084865 | Power saving in monochrome LCD display driver IC's by eliminating extraneous switching A method and a system to reduce the power consumption of a LCD driver have been achieved. In order to save power a logic circuitry is connected to the output of a RAM automatically comparing displayed data on a line by line during the scan and, on detection of no da... | 08/01/2006 |
| 7043021 | Digital video content transmission ciphering and deciphering method and apparatus A video source device generates a session key for each transmission session wherein a multi-frame video content is to be transmitted to a video sink device. The video source device uses the session key to generate a successive number of frame keys. The frame keys in... | 05/09/2006 |
| 7023993 | Signal reproducing/recording/transmitting method and apparatus and signal record medium for use with signals featuring a multiple-phase color burst A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit 19 for discriminating the state of the copying management information read out from each header of a data sect... | 04/04/2006 |
| 6819765 | Video-signal output apparatus, video-signal input apparatus, and scramble method, and descramble method A system, which includes a video-signal output apparatus and a video-signal input apparatus, has a construction in which scrambling or descrambling is performed with a scramble key generated using copy-control information. If the copy-control information has been fa... | 11/16/2004 |
| 6731758 | Digital video content transmission ciphering and deciphering method and apparatus A video source device generates a session key for each transmission session wherein a multi-frame video content is to be transmitted to a video sink device. The video source device uses the session key to generate a successive number of frame keys. The frame keys in... | 05/04/2004 |
| 6526510 | Signal reproducing method and apparatus, signal recording method and apparatus and signal recording system A signal reproducing method and apparatus in which the generation limitation information, such as a token or a ticket, contained in digital data, is recorded in analog signals. A reproducing device 20 reproduces, from a source disc S, picture data etc hav... | 02/25/2003 |
| 6072872 | Determination of scrambling mode of a television signal A signal such as an analog scrambled television signal in a cable television network has first scrambling mode data which is compatible with a first decoder population, but not a second decoder population. The scrambled television signal is processed to d... | 06/06/2000 |
| 5870472 | Dynamic relocation of the service data channel A method and apparatus for preventing unauthorized descrambling of cable programming includes selective relocation of the service data channel within the vertical blanking interval thereby preventing unauthorized descrambling of programming by conventiona... | 02/09/1999 |
| 5768377 | Video signal descrambling apparatus A video signal descrambling apparatus capable of restoring a scrambled video signal transmitted from a cable television or commercial broadcasting system to the original standard video signal to permit subscribers to enjoy the scrambled signal and to prov... | 06/16/1998 |
| 5671278 | Video scrambling with variable function generator A video scrambling and descrambling arrangement utilizes plural scrambling characteristics including a predetermined scrambling waveform and a selectable one of a plurality of phase relationships with respect to the video signal to be scrambled. Descrambl... | 09/23/1997 |
| 5651065 | Insertion of supplemental burst into video signals to thwart piracy and/or carry data A video signal is modified to include a supplemental burst signal on at least some of the scan lines for each frame. The supplemental burst signals are used to prevent a pirate decoder from descrambling horizontally sync suppressed scrambled signals by de... | 07/22/1997 |
| 5539823 | Subscription television picture scrambling and descrambling system providing compatibility with different such systems Video signal scrambling and descrambling methods and apparatus for a subscription TV system are provided which are compatible with other equipment operating in accordance with pre-existing modes of signal scrambling and descrambling. Coded indicator signa... | 07/23/1996 |
| 5287409 | Method and apparatus for frustrating vertical interval detection in scrambled television signals In order to defeat pirate descramblers that detect the occurrence of a vertical blanking interval from a gap in timing data provided on the sound carrier of a scrambled television signal, diversionary pulse information is inserted into the sound carrier d... | 02/15/1994 |
| 5272751 | Pay television In a pay television device, a horizontal sync signal, a vertical sync signal, and the like are removed from a composite video signal, and first-frequency and second-frequency signals for descrambling processing are attached in the intervals corresponding ... | 12/21/1993 |
| 5166976 | System and method for detection of a pulse within a video signal An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal of a frame-by-frame basis and for decrypting encrypted PCM audio information which is transmitted along with the aperiodically inverted v... | 11/24/1992 |
| 5161187 | Cable television system A cable television system includes a transmitter and at least one receiver. In the transmitter, sync information is suppressed in amplitude to execute scrambling, and a sync width information signal and key data are superimposed on a television signal dur... | 11/03/1992 |
| 5113441 | Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal A method of scrambling a television signal and a method of and apparatus for descrambling a television signal is provided. An audio signal is used on which a key signal containing compression information and information concerning the position of a vertic... | 05/12/1992 |
| 5113440 | Universal decoder A microprocessor based decoder module for television video signals which have been encoded by suppressing sync pulses and/or inverting picture video. The decoder modules generates sync restoration gates and/or video inversion gates developed from timing s... | 05/12/1992 |
| 5103477 | Method and apparatus for descrambling a television signal An extension control signal for a vertical blanking interval (VBI) rises at a timing delayed from the last key signal before the VBI by 64 μsec plus the time difference between the key signal and horizontal synchronizing signal section, and falls at a ti... | 04/07/1992 |
| 5063594 | Video signal scrambling system A system for level-compressing a sync signal component of a video intermediate frequency signal to scramble the signal. A compression pulse generation circuit generates a compression pulse in synchronism with a sync signal. A level compression circuit lev... | 11/05/1991 |
| 5060262 | Video scrambling, audio masking and data transmission methods for wireless cable systems Video scrambling is accomplished by attenuating the video carrier during the horizontal blanking interval and/or by omitting horizontal sync pulses, vertical serration pulses and equalizing pulses. The method of scrambling can be dynamically changed, but ... | 10/22/1991 |
| 5022079 | Lock means and TV sync for air-to-surface missile 1. A digital code synchronization locking means comprising: means to receive a first digital code sequence; means to generate a second digital code sequence substantially similar to id first sequence, said means to generate said (second) digital code sequence ... | 06/04/1991 |
| 4962529 | Scrambling method for TV picture A scrambling method for TV pictures avoids picture deterioration by level compressing only selected horizontal flyback portions of the video signal to effect scrambling. A key signal is superposed on selected horizontal synch signals and, when removed at ... | 10/09/1990 |
| 4953208 | CATV system transmitting a scrambled television signal A method of scrambling a television signal is provided in which, during a horizontal blanking interval and during a vertical blanking interval, a video signal is compressed and a key signal containing information concerning the compression is superimposed... | 08/28/1990 |
| 4885776 | Television signal encoder with reduced transient switching effects A television encoding system passes a modulated video carrier through a pair of SAW filters for attenuating and reversing the phase of the carrier during horizontal intervals. Another pair of SAW filters impart intermediate amplitude and phase changes to ... | 12/05/1989 |
| 4817144 | Secure TV scrambling system using framing code switching A television signal scrambling system scrambles by suppressing horizontal syncs and changing the phase of the video carrier during the horizontal intervals. Data is transmitted by using two different widths for the horizontal intervals. Framing code infor... | 03/28/1989 |
| 4815129 | Video encryption system An encrypted video distribution system includes a signal originating station which distributes television signals in a format unrecoverable by a standard television receiver. In particular, the normally occurring vertical and horizontal synchronizing puls... | 03/21/1989 |
| 4807285 | Method and apparatus for scrambling a television signal An in-band television signal scrambling method and apparatus are disclosed which employ a scrambler which receives and scrambles a television signal by suppressing the amplitude of the horizontal synchronizing signals contained therein to a point below th... | 02/21/1989 |
| 4802214 | Method and apparatus for identifying and rendering operative particular descramblers in a television signal scrambling system An in-band television signal scrambling method and apparatus are disclosed which employ a scrambler which receives and scrambles a television signal and one or more descramblers for restoring the scrambled television signal to an unscrambled condition. A ... | 01/31/1989 |
| 4794643 | Method for developing a key signal for descrambling in television broadcasting A scrambling method for TV pictures avoids deterioration of the reproduced picture by level compressing only selected horizontal flyback portions according to a randomly selected pattern to prevent synchronization at the receiver. Key signals are added re... | 12/27/1988 |
| 4706283 | Television signal scrambling system A television signal transmission system comprises a headend including a pair of SAW filters having equal delays, one filter having amplitude and normalized phase versus frequency response characteristics continuously varying between about -6 db and 180 de... | 11/10/1987 |
