| 7043021 |
Digital video content transmission ciphering and deciphering method and apparatus |
| May-9-2006 |
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... |
| 7023993 |
Signal reproducing/recording/transmitting method and apparatus and signal record medium for use with signals featuring a multiple-phase color burst |
| Apr-4-2006 |
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... |
| 6819765 |
Video-signal output apparatus, video-signal input apparatus, and scramble method, and descramble method |
| Nov-16-2004 |
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... |
| 6731758 |
Digital video content transmission ciphering and deciphering method and apparatus |
| May-4-2004 |
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... |
| 6526510 |
Signal reproducing method and apparatus, signal recording method and apparatus and signal recording system |
| Feb-25-2003 |
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... |
| 6072872 |
Determination of scrambling mode of a television signal |
| Jun-6-2000 |
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.... |
| 5870472 |
Dynamic relocation of the service data channel |
| Feb-9-1999 |
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... |
| 5768377 |
Video signal descrambling apparatus |
| Jun-16-1998 |
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... |
| 5671278 |
Video scrambling with variable function generator |
| Sep-23-1997 |
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... |
| 5651065 |
Insertion of supplemental burst into video signals to thwart piracy and/or carry data |
| Jul-22-1997 |
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... |
| 5539823 |
Subscription television picture scrambling and descrambling system providing compatibility with different such systems |
| Jul-23-1996 |
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... |
| 5287409 |
Method and apparatus for frustrating vertical interval detection in scrambled television signals |
| Feb-15-1994 |
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... |
| 5272751 |
Pay television |
| Dec-21-1993 |
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... |
| 5166976 |
System and method for detection of a pulse within a video signal |
| Nov-24-1992 |
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... |
| 5161187 |
Cable television system |
| Nov-3-1992 |
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... |
| 5113441 |
Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal |
| May-12-1992 |
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... |
| 5113440 |
Universal decoder |
| May-12-1992 |
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... |
| 5103477 |
Method and apparatus for descrambling a television signal |
| Apr-7-1992 |
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 .mu.sec plus the time difference between the key signal and horizontal... |
| 5063594 |
Video signal scrambling system |
| Nov-5-1991 |
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... |
| 5060262 |
Video scrambling, audio masking and data transmission methods for wireless cable systems |
| Oct-22-1991 |
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... |
| 5022079 |
Lock means and TV sync for air-to-surface missile |
| Jun-4-1991 |
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,... |
| 4962529 |
Scrambling method for TV picture |
| Oct-9-1990 |
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... |
| 4953208 |
CATV system transmitting a scrambled television signal |
| Aug-28-1990 |
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... |
| 4885776 |
Television signal encoder with reduced transient switching effects |
| Dec-5-1989 |
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... |
| 4817144 |
Secure TV scrambling system using framing code switching |
| Mar-28-1989 |
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... |
| 4815129 |
Video encryption system |
| Mar-21-1989 |
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... |
| 4807285 |
Method and apparatus for scrambling a television signal |
| Feb-21-1989 |
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... |
| 4802214 |
Method and apparatus for identifying and rendering operative particular descramblers in a television signal scrambling system |
| Jan-31-1989 |
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... |
| 4794643 |
Method for developing a key signal for descrambling in television broadcasting |
| Dec-27-1988 |
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... |
| 4706284 |
Television signal data transmission system |
| Nov-10-1987 |
A television signal data transmission system comprises means for transmitting a television signal in which the phase of the RF carrier is modified during a periodically recurring interval by a SAW filter... |
| 4706283 |
Television signal scrambling system |
| Nov-10-1987 |
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... |
| 4700388 |
Apparatus for scrambling a television signal |
| Oct-13-1987 |
An apparatus for scrambling or encoding a television signal by inverting the latter signal in accordance with a control signal having a predetermined code pattern comprises a detector circuit for detecting... |
| 4691354 |
Vertical interval data blanker |
| Sep-1-1987 |
A stretched vertical interval pulse is developed by a transistorized integrating circuit supplied with a composite sync signal applied to a data recovery and unscrambler circuit in a television decoder.... |
| 4679078 |
High security subscription television transmission system |
| Jul-7-1987 |
A system for scrambling and descrambling a composite video signal having video program information, vertical sync pulses, and horizontal sync and blanking information includes an encoder and a decoder.... |
| 4670904 |
System for processing a scrambled video signal |
| Jun-2-1987 |
A television receiver receives a scrambled television signal with a suppressed sync pulse which is restored by a decoder coupled to the receiver. The receiver also includes a noise inverter which alters... |
| 4639777 |
Apparatus for scrambling and descrambling communication signals |
| Jan-27-1987 |
Of the scrambling systems used in CATV and direct satellite broadcasting systems, the invention pertains to the transmission of a keying signal for demodulation. The keying signal, as a carrier wave displaced... |
| 4618888 |
Scrambling system of television signal |
| Oct-21-1986 |
A scrambling system of television signal includes a circuit for eliminating vertical sync pulses in a vertical sync pulse period and equivalent pulses in first and second equivalent pulse periods at opposite... |
| 4614970 |
Descrambler apparatus |
| Sep-30-1986 |
A descrambler apparatus for use with a video transmitter which transmits scrambled video transmission without detectable horizontal or vertical synchronizing pulses but with a descramble signal which occurs... |
| 4613900 |
Digital code reading apparatus and method |
| Sep-23-1986 |
A digital code reader reads the digital key code in a scrambled video signal. The key code represents the scheme used to scramble the signal before broadcasting and is used by the video receiver to unscramble... |
| 4471379 |
Codified field polarity television system |
| Sep-11-1984 |
There is disclosed herein a television system wherein television signals are scrambled or otherwise encoded at the transmitting facility and then unscrambled or decoded at the receiving facility, typically... |
| 4471380 |
Scrambling and descrambling of television signals for subscription TV |
| Sep-11-1984 |
Subscription TV premium programming may be encoded with tagging information as by transmitting a tagging pulse during at least one horizontal line interval of each picture field in addition to pulses which... |
| 4466017 |
Sync suppression scrambling of television signals for subscription TV |
| Aug-14-1984 |
In order to provide higher efficiency of security in sync suppression scrambling of subscription TV signals, the signals are encoded with a timing pulse having a selected time delay relationship with the... |
| 4424532 |
Coding and decoding system for video and audio signals |
| Jan-3-1984 |
A coding and decoding system for video and audio signals includes means at the transmitter for deriving clock and internal timing signals from the video signal. The internal timing signals are utilized... |
| 4396946 |
Transmission of data with a video signal |
| Aug-2-1983 |
The horizontal line synchronizing pulses of a video signal are selectively replaced with a video signal blanking level in dependence upon bits of data, whereby the data is transmitted with the video signal.... |
| 4390898 |
Scrambling and unscrambling video signals in a pay TV system |
| Jun-28-1983 |
A scrambler scrambles a video signal by replacing its vertical intervals with dummy video signal lines, and separately providing information relating to the timing of the replaced vertical intervals. This... |
| 4378570 |
Receiver for jam-resistant TV system |
| Mar-29-1983 |
A jam-resistant receiver for a TV signal in which each vertical sync pulse is replaced by several increasingly-delayed symbols from a pseudo-random number generator. A correlator produces a correlation... |
| 4340906 |
Video signal coding by video signal polarity reversal on the basis of brightness level comparison |
| Jul-20-1982 |
A method and means for coding and decoding video signals by repetitive video signal polarity reversal includes the steps of comparing the brightness level of a predetermined time period of the video signal... |
| 4338628 |
Scrambled video communication system |
| Jul-6-1982 |
A television communication system wherein a composite video signal, is scrambled to prevent a stabilized picture from being displayed by a typical broadcast televison set receiving the scrambled video... |
| 4336553 |
Method of coding audio and video signals |
| Jun-22-1982 |
An audio and video signal coding system in which the normal sync pulses in the horizontal and vertical blanking intervals are suppressed, and clock and control data as well as digital audio data is inserted... |
| 4333107 |
Jam-resistant TV system |
| Jun-1-1982 |
A jam-resistant TV transmission system including means to transmit a composite video signal in which each vertical sync pulse is replaced by several increasingly-delayed symbols from a pseudo-random number... |
