| 5272752 |
Authorization code lockout mechanism for preventing unauthorized reception of transmitted data |
| Dec-21-1993 |
A system and method for using two simple transactions to enable the disconnection of unauthorized receiver terminals. This is accomplished in accordance with the invention by sending an addressed transaction... |
| 5224161 |
Method of scrambling and of unscrambling composite video signals, and device for implementation |
| Jun-29-1993 |
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... |
| 5204900 |
Coding system for descrambling video |
| Apr-20-1993 |
A system for scrambling and descrambling complex signals, such as video signals, employs a system for encoding the decoding information, in the form of two security keys, directly onto the scrambled signal... |
| 5199067 |
Process for promotion of pay television broadcasts, and device for use of the process |
| Mar-30-1993 |
The process of the invention concerns pay television networks with reinforced scrambling. To attract potential subscribers, the invention consists in cyclically transmitting non-scrambled images for brief... |
| 5195134 |
Transmitting, receiving, and automatic recording system for programs with time and channel information |
| Mar-16-1993 |
Scrambled video and audio signals of programs are transmitted from a transmitting system via a communication satellite to a receiving system. The audio signal contains channel, start/end time, and standard... |
| 5123046 |
VCR with cable tuner control |
| Jun-16-1992 |
A video recorder, adapted to receive descrambled signals from a remotely controllable tuner/descrambler for multi-channel cable or satellite signals for recording or provision to a T.V. receiver, includes... |
| 5091938 |
System and method for transmitting entertainment information to authorized ones of plural receivers |
| Feb-25-1992 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 5056136 |
Secure video communications system |
| Oct-8-1991 |
A secure video communications system having at least one command network formed by a combination of subsystems. The combination of subsystems to include a video subsystem, an audio subsystem, a communications... |
| 5036537 |
Geographic black-out method for direct broadcast satellite system |
| Jul-30-1991 |
Television programs are broadcast to a plurality of receiver units in various geographic areas. Each unit has a memory for storage of a designation code representative of its location and a memory for... |
| 5027400 |
Multimedia bidirectional broadcast system |
| Jun-25-1991 |
A multimedia bidirectional broadcast system including a broadcast station and subscriber terminals. The broadcast station includes a main control unit having therein a data base control table in which... |
| 5016273 |
Dual communication mode video tape recorder |
| May-14-1991 |
The present invention is a dual communication mode sysem that combines a point to point communications device with a television receiver and a video tape recorder. The result is a highly versatile and... |
| 5003591 |
Functionally modifiable cable television converter system |
| Mar-26-1991 |
A cable television converter with remotely modifiable functionality receives firmware downloaded over a cable television network. The integrity of the firmware is verified, and if valid, the firmware is... |
| 4945563 |
Video system and method for controlled viewing and videotaping |
| Jul-31-1990 |
A satellite TV or cable video receiver includes a decoder for decoding information embedded in a broadcasted TV program which can be utilized to permit an operator to select the program for viewing only,... |
| 4937865 |
Cable TV channel security system having remotely addressable traps |
| Jun-26-1990 |
A cable television channel security system for installation at a subscriber location to control access to one of more channels of RF signals transmitted from a headend location via conventional cable means.... |
| 4905278 |
Scrambling of analogue electrical signals |
| Feb-27-1990 |
In a system in which an audio signal is scrambled by being divided into blocks each comprising a plurality of segments, and the segments are re-ordered within the blocks to provide the scrambled signal,... |
| 4890321 |
Communications format for a subscription television system permitting transmission of individual text messages to subscribers |
| Dec-26-1989 |
A subscription television system in which individual decoders are enabled to receive individually addressed messages is disclosed. The composite signal, including video and teletext, also comprises addressed... |
| 4866770 |
Method and apparatus for communication of video, audio, teletext, and data to groups of decoders in a communication system |
| Sep-12-1989 |
A communication system enabling transmission of individual subscriber teletext messages, audio and video to individual subscribers and permitting group communications of audio, video, teletext and data... |
| 4864613 |
Broadband converter/descrambler interface for cable TV |
| Sep-5-1989 |
A broadband converter/descrambler intended for use with cable-ready video appliances (e.g., a VCR or television) receives signals from a cable TV drop. The cable TV signals are characterized by a plurality... |
| 4823385 |
System for processing coded information |
| Apr-18-1989 |
A system for processing coded information is disclosed. A receiver receives coded information from a source. The receiver is equipped with a decoder and a real time clock. The coded information is decoded... |
| 4771456 |
Cable television channel selector/descrambler for use with cable-ready video applicances |
| Sep-13-1988 |
A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjunction with a cable television system providing... |
| 4759061 |
Technique for toggling coding mode in a television signal encoder |
| Jul-19-1988 |
A technique for toggling the coding mode in a television signal encoder comprises establishing a rectangular window defining a relatively small and substantially centrally located portion of the field... |
| 4759060 |
Decoder for a pay television system |
| Jul-19-1988 |
A decoder for a pay television system incorporates a receiver for receiving scrambled programming and control data transmitted from a remote location, with the control data including data corresponding... |
| 4727579 |
Scrambled television signals |
| Feb-23-1988 |
A television receiver for receiving scrambled television signals has an arrangement (3) which provides scrambled video components (V) and packet arranged sound/data components (D) some of which are also... |
| 4712239 |
Security arrangement for downloadable cable television converters |
| Dec-8-1987 |
A method and apparatus prevent unauthorized programming viewing via a downloadable cable television converter. A booter checksum is computed from data contained in a downloaded booter image. A valid checksum... |
| 4710955 |
Cable television system with two-way telephone communication path |
| Dec-1-1987 |
A method and apparatus to enable billing of subscribers of pay-per-view television systems or the like on a non-real-time basis. A scrambled television signal is received at a subscriber terminal from... |
| 4704725 |
Signal processing apparatus and methods |
| Nov-3-1987 |
Apparatus and methods for automatically controlling programing transmissions and presentations on television and radio equipment and monitoring the programing transmitted and presented. ("Programing" here... |
| 4700387 |
Broadcast system for scrambled programming signals |
| Oct-13-1987 |
A pay program signal is scrambled in an exclusive OR circuiit by a scrambling signal (Ks) derived from a random number generator. The pay program signal is converted into a broadcasting signal by a converter.... |
| 4700386 |
Technique for promoting CATV pay-per-view events and acknowledging subscriber orders |
| Oct-13-1987 |
In CATV systems employing one-way addressable converters in a subscriber's premise, a computer at the system head-end develops tagged messages for display on the subscriber's television to both promote... |
| 4694491 |
Cryptographic system using interchangeable key blocks and selectable key fragments |
| Sep-15-1987 |
A cryptographic system is used for the secure transmission of digitized signals to a plurality of receivers. At the transmission end, a key consisting of two blocks, each including a plurality of key fragments,... |
| 4691351 |
Television signal receiving apparatus |
| Sep-1-1987 |
A television signal receiving apparatus is provided having a program schedule display function. The apparatus includes a tuner, a television signal processing circuit connected to the tuner, a digital... |
| 4688248 |
Pay television system |
| Aug-18-1987 |
A pay television system generally comprises a signal generating center, signal distributers and subscriber devices. The center produces and combines a television signal and a control signal and supplies... |
| 4688249 |
CATV system and method of curtailing reception of unauthorized service channels |
| Aug-18-1987 |
An "Anti-Piracy" system and method are disclosed which includes an FSK modulator at the head end CATV transmitting location which, in response to data from an addressing computer, randomly issues Anti-Piracy... |
| 4633309 |
Cable television master/slave decoder control |
| Dec-30-1986 |
A method of controlling the operation of slave decoders in a cable television distribution system having a central control computer; in which each subscriber location having a slave decoder also has a... |
| 4628359 |
Memory selecting system for scrambled television receiver |
| Dec-9-1986 |
A scrambled television program that is received and recorded in a scrambled fashion includes program code and corresponding key codes for use in descrambling the recorded scrambled signal. The program... |
| 4623920 |
Cable network data transmission system |
| Nov-18-1986 |
A system for providing television, information and data signals via a transmission network to selected subscribers, to groups of subscribers, or to all subscribers connected in common to the transmission... |
| 4611242 |
Two mode scrambling system using identifier pulse in vertical blanking interval |
| Sep-9-1986 |
A cable television system capable of decoding signals encoded in two different formats, A and B. Format A is identified by digital data on horizontal lines 10-13 in the vertical blanking interval and format... |
| 4599647 |
Receiver with interface for interaction with controller-decoder |
| Jul-8-1986 |
An interface permits bi-directional data signal transfer between the microcomputer of the receiver and an addressable controller-decoder designed for use in conjunction therewith. The data transfer permits... |
| 4590519 |
Television signal scrambling/descrambling system |
| May-20-1986 |
An in-band television signal sync suppression scrambling system has two sync suppression modes which are aperiodically alternated. Horizontal and vertical synchronizing pulses are equally suppressed in... |
| 4531020 |
Multi-layer encryption system for the broadcast of encrypted information |
| Jul-23-1985 |
A method of controlling the simultaneous broadcast of enciphered digital information signals, for example in a radio or television broadcast environment, to a plurality of subscribers provides several... |
| 4517595 |
Pay television channel selector |
| May-14-1985 |
In a pay television channel selector, a reception contract selecting portion comprises parallel circuits which are disposed in correspondence with channels and whose impedances are made different between... |
| 4450481 |
Tamper-resistant, expandable communications system |
| May-22-1984 |
An expandable, multipurpose digital and analog communications system in which a plurality of remote interrogator units connected in a branch of the system are isolated from one another by band stop filters... |
| 4430669 |
Transmitting and receiving apparatus for permitting the transmission and reception of multi-tier subscription programs |
| Feb-7-1984 |
During non-program hours, a subscription broadcast television station broadcasts in place of programming the time of a future special broadcast as well as other information to enable decoding circuitry... |
| 4323922 |
Television coding system with channel level identification |
| Apr-6-1982 |
A converter/decoder for use in subscription television includes means for converting any input TV channel to a predetermined output channel. Decoding means are connected to the converter at its output... |
| 4322745 |
Television signal scrambling method for CATV system |
| Mar-30-1982 |
A television signal scrambling and descrambling method and apparatus for use with a community antenna television system in which the scrambling mode employed is changed from time to time so that one cannot... |
| 4245245 |
Interactive CATV system |
| Jan-13-1981 |
A two-way CATV system having a substantial number of terminals incorporates a central processor and transmitter system which continually interrogates the terminals at high speed, monitoring changes of... |
| 4118669 |
Remote disconnect-reconnect tap for cable television systems |
| Oct-3-1978 |
A remotely controlled disconnect-reconnect tap for a cable television system having a head end feeding a cable distribution system. The tap comprises means for receiving and detecting a plurality of pairs... |
| 4115807 |
Telephone billing apparatus for a subscription television system |
| Sep-19-1978 |
Each decoder has a random access memory storing program code, a security number, a customer identification number, and program identification numbers utilized for billing purposes. Communication between... |
| 4109281 |
Terminal device for CATV |
| Aug-22-1978 |
In a CATV system, a received signal band containing video channels and a data signal at a selected frequency is successively converted in frequency so as to provide a chosen video signal at the frequency... |
| 3975585 |
Electronic communications system for supplementary video program distribution |
| Aug-17-1976 |
A one-way cable communications system -- as for a lodging facility, distributes commercial and supplementary video programming from common equipment to spaced subscriber stations located, for example,... |
