Matches 1 - 50 out of 59 1 2 >
Match Document Document Title
7620178 Copy protection for video signal added pulses  
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. In one version, positive going pulses are added to the video...
7492896 Copy protection for video signal using added negative amplitude pulse  
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan...
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...
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 )...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
4706284 Television signal data transmission system  
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...
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...
4700388 Apparatus for scrambling a television signal  
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...
4691354 Vertical interval data blanker  
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...
4679078 High security subscription television transmission system  
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...
4670904 System for processing a scrambled video signal  
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...
4639777 Apparatus for scrambling and descrambling communication signals  
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...
4618888 Scrambling system of television signal  
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...
4614970 Descrambler apparatus  
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...
4613900 Digital code reading apparatus and method  
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...
4471380 Scrambling and descrambling of television signals for subscription TV  
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...
4471379 Codified field polarity television system  
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,...
4424532 Coding and decoding system for video and audio signals  
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...
4396946 Transmission of data with a video signal  
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...
4390898 Scrambling and unscrambling video signals in a pay TV system  
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...
4378570 Receiver for jam-resistant TV system  
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...
4340906 Video signal coding by video signal polarity reversal on the basis of brightness level comparison  
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...
4338628 Scrambled video communication system  
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...
Matches 1 - 50 out of 59 1 2 >