| 5237610 |
Independent external security module for a digitally upgradeable television signal decoder |
| Aug-17-1993 |
A decoder for descrambling encoded satellite transmissions comprises an internal security module and a resplaceable security module. The program signal is scrambled with a key and then the key itself is... |
| 5231664 |
Cable system having multiple barkering |
| Jul-27-1993 |
A cable television system includes a headend unit having a plurality of program signal sources, encoders, scrambling circuits, and channel modulators for producing a plurality of program channels modulated... |
| 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... |
| 5053883 |
Terminal polling method |
| Oct-1-1991 |
A method of transferring data from a plurality of remote terminals to a central location over a communication network is disclosed. First random numbers are respectively generated for each of the remote... |
| 5046093 |
CATV subscriber apparatus with intelligent remote control |
| Sep-3-1991 |
Subscriber apparatus for a cable television system or the like comprises a converter/descrambler and a programmable remote control. All authorization data for premium services and features a subscriber... |
| 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... |
| 4995078 |
Television broadcast system for selective transmission of viewer-chosen programs at viewer-requested times |
| Feb-19-1991 |
A television broadcast system using land lines is provided for real-time transmission of a viewer-chosen program at a viewer requested time to the requesting viewer's television receiver. The preferred... |
| 4982430 |
Bootstrap channel security arrangement for communication network |
| Jan-1-1991 |
Apparatus and a method are disclosed to enable on-line modification and upgrading of terminal software in a communication network while maintaining the integrity of communication between a service provider... |
| 4961109 |
Chargeable program receiving limit setting system in two-way cable television system |
| Oct-2-1990 |
A CATV television system in which a subscriber can only charge a maximum number of events before the central facility polls the subscriber's terminal unit for charged events. The subscriber's terminal... |
| 4947244 |
Video selection and distribution system |
| Aug-7-1990 |
A video distribution system transmits selected video programs to a number of independently controlled video monitors. The video monitors are arranged in groups, each group being coupled to a distinct transmission... |
| 4901367 |
Cable communications system with remote switching and processing converters |
| Feb-13-1990 |
A two-way cable distribution system for offices and office/apartment complexes wherein a single cable is used to interconnect tenants or owners with video/audio, facsimile, security and data services;... |
| 4890320 |
Television broadcast system for selective transmission of viewer-chosen programs at viewer-requested times |
| Dec-26-1989 |
A televsion broadcast system using land lines is provided for real-time transmission of a viewer-chosen program at a viewer requested time to the requesting viewer's television receiver. The preferred... |
| 4823386 |
Addressable subscriber cable television system |
| Apr-18-1989 |
An addressable cable television system includes a transmission cable for transmitting a plurality of television signals driven onto the cable from a head end thereof and a plurality of multiple subscriber... |
| 4752954 |
Upstream signal control apparatus in bidirectional CATV system |
| Jun-21-1988 |
A CPU in a subscriber terminal generates upstream data and a transmission request signal as an enable signal for sending the upstream data to a broadcast center. An oscillator generates a carrier wave... |
| 4710956 |
Cable television system |
| Dec-1-1987 |
A cable television system and method in which each subscriber's converter is located outside the subscriber's premises in an external control unit ("ECU") which also includes several other subscribers'... |
| 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... |
| 4673976 |
Cable television system data verification apparatus |
| Jun-16-1987 |
In a cable television system in which the individual subscriber's converter/tuner is located outside the subscriber's premises in an external control unit ("ECU") and controlled remotely via a subscriber... |
| 4638356 |
Apparatus and method for restricting access to a communication network |
| Jan-20-1987 |
Apparatus restricts access to a communication network having at least one service node for providing services to subscribers. A subscriber terminal, coupled to the communication network, includes a secret... |
| 4580161 |
Cable television subscriber control system including addressable filters having a variable pole |
| Apr-1-1986 |
A filter for use in a cable television system for filtering out a given channel comprising a two pole filter, said filter including one pole which is fixed at the center frequency to be tuned out and a... |
| 4554579 |
Two-way CATV system with AML commands |
| Nov-19-1985 |
In a two-way cable television (CATV) system, multiple subscriber address codes are provided during designated vertical blanking interval (VBI) lines of the video signal transmitted from the CATV headend... |
| 4538174 |
Two-way subscriber TV system with multiple subscriber's sets |
| Aug-27-1985 |
A communications system comprising at least one exchange, television signal sources located at the exchange, subscriber's units each connected to the exchange by a respective direct communications link... |
| 4533948 |
CATV Communication system |
| Aug-6-1985 |
A two way digital communication arrangement utilizes a CATV system to provide bidirectional data transport service between any two points within the CATV system. The headend receives an upstream message... |
| 4530008 |
Secured communications system |
| Jul-16-1985 |
Apparatus and method for reducing the cost and complexity of equipment placed on subscribers' premises in a subscription communications system, such as a cable television system, while at the same time... |
| 4475123 |
Addressable subscriber cable television system |
| Oct-2-1984 |
An addressable cable television system includes a transmission cable for transmitting a plurality of television signals driven onto the cable from a head end thereof and a plurality of multiple subscriber... |
| 4365249 |
Line monitoring device in two-way data communication system |
| Dec-21-1982 |
A line monitoring device for use in a two-way data communication system such as a CATV system in which up-signals are transmitted by terminal units in response to retrieving signals applied thereto from... |
| 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... |
| 4162483 |
Bilateral master station-plural satellite station signalling apparatus |
| Jul-24-1979 |
A bilateral digital signalling network couples a master station and plural remote, or satellite stations via a common communications link--as by way of an MATV coaxial cable. Any data/control signals may... |
