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4754426 |
System for controlling communications on a cable television network
A system for controlling a cable television network includes a head end, a plurality of addressable external control units having subscriber converters located off the subscriber's premises, and...
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4686564 |
Communication data processing device of cable television system
An external control unit for a CATV system has a CPU and a RAM with many kinds of memory maps. Reference data to be stored in the memory maps is transmitted from a central station. When a...
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4677686 |
Passive transmission of data over cable TV systems
A communications system which enables enhanced services to be provided over cable TV systems. The design of the system is such that amplification is not required. Therefore, two-way transmission is...
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4591906 |
Wireless transmission from the television set to the television station
Query signals are transmitted by wireless means from the television station to the television set. Response units at receiver locations have a radio frequency transmitter send a response to the...
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4558464 |
Address-programmable CATV converter
An addressable CATV converter for connection with a remote headend in a cable distribution system contains a memory into which a unique address code identifying that converter is downloaded from...
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4558358 |
Cable network monitoring system for CATV system
A CATV system includes terminal units with which two-way data communication with a central terminal is possible. A cable network monitoring system is capable of assisting in the location of faults...
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4538176 |
Buffer memory dispersion type video/audio transmission system
A video/audio transmission system for sending video and audio information from video and audio files of a center to a subscriber through a subscriber's junction line is disclosed in which at least...
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4538174 |
Two-way subscriber TV system with multiple subscriber's sets
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...
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4512033 |
Remote level adjustment system for use in a multi-terminal communications system
A remote level adjustment system for use in a multi-terminal communications system wherein a plurality of remote terminals are connected to a master terminal by a distribution network for...
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4506387 |
Programming-on-demand cable system and method
A programming-on-demand cable system is provided which allows any one of a plurality of individual users to request anyone of a plurality of video programs they wish to view from a library of...
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4494111 |
Frequency agile security apparatus
A cable TV security system utilizes three radio frequency signals as three data communication channels: one downstream channel and two upstream channels. A headend alarm processor transmits system...
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4494138 |
Segmented upstream management for cable television
A segmented upstream management system for a bidirectional coaxial network of the type including a bidirectional trunk (14) having a plurality of bidirectional feeders (12) and a plurality of drops...
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4484218 |
Video distribution control system
A subscriber distribution terminal is connected to the transmission medium for serving a group of subscribers. Within the distribution control terminal is located a plurality of television...
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4475121 |
Polling pattern generator for CATV system
A polling pattern generator system for use in a CATV system including a polling pattern generator and a passive data monitor. The polling pattern generator periodically generates polling pattern...
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4454538 |
Data communication in CATV system
A CATV system having a central facility connected through cables to a number of terminal units to establish two-way data communication. Each terminal unit includes a PLL that oscillates at a...
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4408345 |
Remote line monitoring method and device for CATV system
A remote line monitoring device and method for a CATV system in which a center facility is connected to plural terminal units through cables of the system to transmit television signals to...
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4402008 |
Wideband switching architecture
A communication method and wideband switching network in which wideband signals are communicated through the network with minimal crosstalk between the wideband signals. Minimal crosstalk is...
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4386424 |
Broad band telecommunication system
In an exemplary embodiment, subscriber lines are formed by means of light waveguides and transmit pulse-modulated TV signals in time-division multiplex. These pulse-modulated signals are converted...
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4365267 |
Passive data monitor for use with polling pattern generator in CATV system
A polling pattern generator system for use in a CATV system including a polling pattern generator and a passive data monitor. The polling pattern generator periodically generates polling pattern...
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4361730 |
Security terminal for use with two-way interactive cable system
A security terminal for use with a two-way interactive cable system. The security terminal develops alarm and supervisory signals, and controls their transmission over the cable when polled by a...
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4360828 |
Hotel/motel power load control and bilateral signalling apparatus
Head end apparatus delivers video signals, e.g., premium and standard television programming to distinct locations such as hotel/motel rooms, an apartment or the like via a common MATV cable. The...
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4347604 |
Bi-directional data communications system
A bi-directional data communications system including a single center facility and plural terminal control devices. A pair of up-data and down-data lines connect the central facility and the plural...
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4295154 |
Digital video and audio file system
A digital video and audio file system is provided for use in systems such as a center-to-end video communication system. In the file system, video information, such as a color television video...
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4290142 |
Interactive cable television system
An interactive cable television system for serving a plurality of user locations in a service area divided into a plurality of service regions, including a central office and a service network...
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4245245 |
Interactive CATV system
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...
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4079414 |
Interrogated transponder system
Method for selectively interrogating decoding devices which are located at remote stations. In one embodiment, a number of transponders which make up a final group within a larger group of...
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4057829 |
Communications TV monitoring and control system
A communications control system applicable to an existing master antenna television (MATV) system normally installed in a building, or CATV systems that use special entertainment feature inputs...
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4008369 |
Telephone interfaced subscription cable television system especially useful in hotels and motels
A PABX telephone interfaced cable television system especially useful in hotels and motels for distributing free and premium program channels via a coaxial cable television signal distribution...
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4002843 |
Tamper-proof two-way cable system
There is disclosed a two-way cable system in which the deliberate introduction of continuous upstream message interference at any subscriber terminal does not destroy the efficacy of the system....
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3997718 |
Premium interactive communication system
A cable television and communication system is disclosed which is suitable for community antenna television (CATV) closed circuit television (CCTV) and other types of signal distribution systems...
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3922482 |
Wired broadcasting systems
A wired television broadcasting program exchange provides a signal channel for at least one auxiliary dc or low-frequency signal of a nature that will perform the auxiliary functions of...
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3879583 |
Reconstruction of telephone dial signals
Apparatus for the reconstruction of a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line. The present apparatus receives...
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3859596 |
CABLE TELEVISION TWO-WAY COMMUNICATION SYSTEM
This disclosure relates to a two-way communication for use on cable television systems where each user terminal may be individually polled for service requirements, and such requirements provided...
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3803491 |
COMMUNICATIONS SYSTEM
A number of different remote units are interrogated and controlled by signals transmitted thereto from a master station. The transmitted interrogation and control signals take the form of three...
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3794922 |
DATA SAMPLING COMMUNICATION SYSTEM
Disclosed is a system for sampling or interrogating selected ones of a plurality of remote units at which are located television receivers, to determine which of a plurality of television channels...
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3790700 |
CATV PROGRAM CONTROL SYSTEM
A system for controlling CATV program viewing in a plurality of modes of operation. In a first mode of operation, a downstream digital transmission causes control means to develop first binary data...
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3786424 |
COMMUNICATIONS SYSTEM FOR DATA TRANSMISSION AND RETRIEVAL
A communications system, such as a cable television system, embodies an arrangement for data transmission which utilizes a combination of time and frequency division. Groups of data transmitters...
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3772649 |
DATA INTERFACE UNIT FOR INSURING THE ERROR FREE TRANSMISSION OF FIXED-LENGTH DATA SETS WHICH ARE TRANSMITTED REPEATEDLY
A data interface unit is designed to receive fixed-length data sets which are transmitted repeatedly and which differ from one another only in the reversal of a single data bit between successive...
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3757035 |
INTERROGATED TRANSPONDER SYSTEM
A system, method and apparatus for selectively interrogating transponders which are located at remote stations connected to a central interrogating station. In one embodiment, a number of...
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3742462 |
DATA SYNCHRONIZING UNIT FOR DATA TRANSMISSION SYSTEM
A data synchronizing unit analyzes an incoming data signal and generates a strobe signal at times when data bits may be extracted from the incoming data signal with the least chance of error. The...
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3716654 |
REAL TIME REMOTE USE METERING FOR BROADCAST RECEIVERS
A system is disclosed for providing real time remote use metering of the receivers in an over-the-air pay TV system of the type in which a characteristic of the composite video signal is varied...
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3691295 |
TWO-WAY COMMUNICATION SYSTEM FOR VIDEO AND DIGITAL DATA
Transmission system for jointly linking a video source to a television display device, and a digital data source to a digital data output by means of a single coaxial cable. A video source and the...
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3255306 |
Closed-circuit television network
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3706040 |
Title is not available
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