| 7043022 |
Packet order determining method and apparatus |
| May-9-2006 |
A transmitter adds packet transmission order information to transmitted packets using a forward error device (416) and a masking device (420). The masking device (420) receives ordering masks (610) from... |
| 6925342 |
System and method for protecting digital media |
| Aug-2-2005 |
A system and method for verifying digital recordings that have a plurality of tracks. The system includes an encoder that: divides the digital recording into a plurality of sections and associates a random... |
| 6839433 |
Method and apparatus for generating a signal that defeats illegal cable decoders |
| Jan-4-2005 |
Illegal cable decoders, i.e., black boxes, are defeated by adding, inserting and/or superimposing an added signal onto an already scrambled video signal, which added signal is capable of disrupting the... |
| 6792111 |
Cryptation system for packet switching networks based on digital chaotic models |
| Sep-14-2004 |
A cryptation system for information transmitted through packet switching networks masks the digital information data by combining it at the transmitting station with digital data of a certain cryptation... |
| 6477431 |
Watermark detection |
| Nov-5-2002 |
A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (d.sub.k) of the watermark (W.sub.i) and the information signal... |
| 6408076 |
Digital video broadcasting |
| Jun-18-2002 |
In order to descramble sections of scrambled data interleaved with sections of unscrambled data in a transport stream of broadcast video data, while leaving the sections with the original timing relationship... |
| 6330333 |
Cryptographic system for wireless communications |
| Dec-11-2001 |
A wireless communications system (110) with increased privacy. The system (110) transmits an encrypted signal between a base station (112) and a wireless terminal (122). In the forward channel, the base... |
| 6240184 |
Password synchronization |
| May-29-2001 |
A system, method, and data structure provide for securely synchronizing passwords and/or other information between systems. The password-related information is stored in the systems in a secure manner,... |
| 6216228 |
Controlling video or image presentation according to encoded content classification information within the video or image data |
| Apr-10-2001 |
Provided is a method and a system for automatically controlling display of video or image data in dependence on content classification information which is integrated within the data by means of invisible... |
| 6148320 |
Multichannel digital signal generation method and apparatus |
| Nov-14-2000 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective... |
| 6061793 |
Method and apparatus for embedding data, including watermarks, in human perceptible sounds |
| May-9-2000 |
A technique for hiding of data, including watermarks, in human-perceptible sounds, that is, audio host data, is disclosed. In one embodiment a method comprises three steps. In the first step, data to be... |
| 5754650 |
Simultaneous multichannel television access control system and method |
| May-19-1998 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective... |
| 5682426 |
Subscriber site method and apparatus for decoding and selective interdiction of television channels |
| Oct-28-1997 |
An decryption system which facilitates simultaneous decryption of multiple encrypted television channel signals thus making them simultaneously available for direct tuning in television receivers. The... |
| 5430799 |
Multichannel television signal scrambling and descrambling system and method |
| Jul-4-1995 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective... |
| 5091935 |
Method and system for scrambling information signals |
| Feb-25-1992 |
A method and system for scrambled transmission of an information signal having a regular, repeating information rate from which a receiver of the information signal derives synchronizing information as... |
| 5022078 |
Television signal enhancement and scrambling system |
| Jun-4-1991 |
A television signal is distorted by passing it through a distortion amplifier which applies a Gaussian distortion curve to the signal. The curve has a maximum increase in amplitude of about 38 dB, which... |
| 4920566 |
Dual loop sinewave descrambler and method of descrambling |
| Apr-24-1990 |
A method and apparatus are provided for descrambling a sinewave scrambled television signal. The television signal is applied to a dual loop circuit that detects AM sinewave modulation on the television... |
| 4790010 |
Enhanced scrambling method and system for TV signals |
| Dec-6-1988 |
A television signal transmission system includes a cable head-end having a scrambler for scrambling a television signal and a subscriber decoder having an unscrambler for unscrambling the television signal... |
| 4731838 |
AGC circuit used in a CATV receiver |
| Mar-15-1988 |
An AGC circuit used in a subscriber's receiver of a CATV system in which the television signal is scramble-modulated so that only subscribers are allowed to view toll programs, wherein the detected video... |
| 4589016 |
FM television signal receiving circuit |
| May-13-1986 |
A receiving circuit for receiving an FM-modulated television signal with an energy dispersal signal superposed thereon is used for a television receiver for receiving the FM-modulated television signal.... |
| 4581637 |
PIN diode modulator |
| Apr-8-1986 |
A sine wave modulator for decoding a sine wave encoded television signal includes a passive attenuation network comprising a pi-arrangement of PIN diodes. The encoded signal is supplied to the input port... |
| 4568974 |
Video scrambling by the application of a variable periodic scrambling waveform |
| Feb-4-1986 |
A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture... |
| 4489347 |
Sine-wave decoding technique |
| Dec-18-1984 |
A decoder includes an oscillator supplying a decoding signal to the control input of an RF modulator for decoding a sine wave encoded television signal. The decoding signal developed by the oscillator... |
| 4454543 |
Dynamic video scrambling |
| Jun-12-1984 |
A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the brightness level during a predetermined time period... |
| 4447828 |
Phase change dynamic scrambling |
| May-8-1984 |
A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals, which scrambling signals have a common frequency but differ in phase, includes means... |
| 4353088 |
Coding and decoding system for video and audio signals |
| Oct-5-1982 |
A coding and decoding system for video signals includes means at the transmitter for applying sine wave amplitude modulation of approximate line frequency to the aural carrier to prevent the chrominance... |
| 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... |
| 4330794 |
Multichannel subscription television system |
| May-18-1982 |
Sinusoidal timing reference signals, each of which is associated with a different suppresed-sync scrambled-priority television channel signal, frequency modulate associated carrier frequency signals for... |
| 4313133 |
Scrambling and descrambling system in CATV broadcasting system |
| Jan-26-1982 |
Scrambling of the television signal in a CATV broadcasting system is effected by modulating the audio signal with a pilot signal, and modulating both the audio and video with a scrambling signal of a different... |
| 4148064 |
Jamming circuit for television signals |
| Apr-3-1979 |
A circuit for transmitting a jamming signal for disruption of a television signal transmitted along a cable or other guided path toward a television receiver, the circuit having a first oscillator means... |
| 4145717 |
Subscription TV audio carrier recovery system |
| Mar-20-1979 |
A subscription TV decoder for processing encoded audio and video signals in which the TV program audio information is received as an audio subcarrier includes means for decoding the video signal, a filter... |
| 4145716 |
Descrambling device in CATV system |
| Mar-20-1979 |
A descrambler system for a CATV television signal having IF audio, video and synchronizing components that is scrambled by a first amplitude modulation of the IF audio component and a second amplitude... |
| 4095258 |
Apparatus for decoding scrambled television and similar transmissions |
| Jun-13-1978 |
This disclosure deals with a novel scrambled television decoding system for modulation-suppressed trains of synchronizing signals at a predetermined line rate, in which the demodulating circuits produce... |
| 4064536 |
Video scrambler and descrambler apparatus |
| Dec-20-1977 |
Video signals for television are effectively scrambled and may later be descrambled without the presence of annoying visual disturbances by the introduction of a superposed distorted sine wave in synchronism... |
| 4024575 |
Catv sine wave coding system |
| May-17-1977 |
A means for decoding a generally constant frequency sine wave scrambled television signal uses an automatic gain control circuit in a closed loop. The scrambling, applied at the head end of the television... |
