| 5602920 |
Combined DCAM and transport demultiplexer |
| Feb-11-1997 |
A combined condition access and transport demultiplexer circuit comprises a decryption device receiving a demodulated transport bitstream including a plurality of multiplexed conditional access (CA) and... |
| 5598471 |
Method and apparatus for encoding and decoding of audio transmission signals |
| Jan-28-1997 |
A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption algorithm;... |
| 5590202 |
Countdown system for conditional access module |
| Dec-31-1996 |
A digital conditional access module for a subscriber terminal comprises a decryption device including at least one PID register and an associated countdown register. The decryption device is enabled for... |
| 5557677 |
Method and arrangement for communication of information |
| Sep-17-1996 |
In a transmitter, information for transmission is received in the form of a digital signal, electrical or optical, which is converted into short signal fragments, each of which is assigned an index. A... |
| 5557675 |
Computer controlled audio-visual system |
| Sep-17-1996 |
A computer receiving an audio/video signal for controlling an audio/video system including at least one television, comprising a tuner for tuning a selected channel from among a plurality of channels present... |
| 5530756 |
Television scrambling and descrambling method, and transmitter and receiver using said method |
| Jun-25-1996 |
In a television transmission system comprising an analog video channel scrambled with a control word which is changed occasionally and a NICAM sound channel scrambled with a control word which is also... |
| 5521979 |
Packet video signal inverse transport system |
| May-28-1996 |
An inverse transport processor system for a TDM packet signal TV receiver includes apparatus for selectively extracting desired payloads of program component data and coupling this data to a common buffer... |
| 5519780 |
System and method for providing compressed digital teletext services and teletext support services |
| May-21-1996 |
A teletext system provides teletext services and teletext support services in a multiservice communication system. Multiplexed data streams for a plurality of services, including teletext data, are transmitted... |
| 5506904 |
System and method for transmitting and receiving variable length authorization control for digital services |
| Apr-9-1996 |
Authorization information, such as blackout and spotlight regions, circular blackout and spotlight regions, and tier pointers, may be transmitted from an encoder to a decoder in a plurality of sessions... |
| 5506903 |
Digital multiplex transmission system |
| Apr-9-1996 |
A digital multiplex transmission system wherein the rate of convolution codes can be changed over in accordance with an object of a user without changing the transmission rate. A frame for transmitting... |
| 5506902 |
Data broadcasting system |
| Apr-9-1996 |
A data broadcasting system for the low-cost delivery of character-heavy data such as newspapers and magazines. Newspaper or other data are transmitted from a newspaper publisher or service to an artificial... |
| 5488659 |
Encryption/decryption process and apparatus for a multichannel television system |
| Jan-30-1996 |
An encryption/decryption system which facilitates simultaneous decryption of multiple encrypted television signals thus making them simultaneously available for direct tuning in television receivers. The... |
| 5475754 |
Packet video signal inverse transport processor memory address circuitry |
| Dec-12-1995 |
In an inverse transport processor, program component packet payloads of respective program components are directed to select areas of random access memory (RAM) (18) in accordance with a plurality of start... |
| 5459789 |
Packet TV program component detector |
| Oct-17-1995 |
Apparatus for selecting predetermined ones of packets of signal components, from a signal stream of packets includes a control device, responsive to user selection and a transmitted program guide, for... |
| 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... |
| 5425101 |
System and method for simultaneously authorizing multiple virtual channels |
| Jun-13-1995 |
A decoder in a multiservice communication system receives a plurality of services as data streams, including video, audio, teletext, and utility data, multiplexed in sequence of frames. Each service defines... |
| 5420866 |
Methods for providing conditional access information to decoders in a packet-based multiplexed communications system |
| May-30-1995 |
In a packet-based multiplexed communications system, a method of providing different sets of conditional access information to a remote location comprises the steps of: (a) for each different set of conditional... |
| 5412724 |
Method of making up a digital multiplex, and apparatus implementing said method |
| May-2-1995 |
The method is for generating a digital multiplex signal for broadcasting. The multiplex is made up of packets of determined length coming from a plurality of sources, by applying a treatment selected from... |
| 5412720 |
Interactive home information system |
| May-2-1995 |
An interactive cable television system having a plurality of feeder servers, a plurality of home interface controllers and a feeder port. Home interface controllers are each equipped with a radio frequency... |
| 5400401 |
System and method for transmitting a plurality of digital services |
| Mar-21-1995 |
A plurality of digital services are carried in a multiplex data stream to a plurality of remote locations. The multiplex data stream comprises a continuous sequence of frames. Each frame comprises two... |
| 5381481 |
Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
| Jan-10-1995 |
Methods and apparatus are described for uniquely encrypting a plurality services at a transmission site and for decrypting selected services at a reception site while reducing the amount of encryption... |
| 5341425 |
Methods and apparatus for uniquely encrypting data at a plurality of data transmission sites for transmission to a reception site |
| Aug-23-1994 |
In a data transmission system comprising a plurality N of transmission sites and at least one reception site, a set of data at each transmission site is uniquely encrypted by (a) providing each transmission... |
| 5339315 |
Cable broadcasting system and the transmission center for on demand program services |
| Aug-16-1994 |
The present invention provides a cable broadcasting system and the transmission center employed therein. In the transmission center, plural images are divided into several groups in the same kinds and... |
| 5319707 |
System and method for multiplexing a plurality of digital program services for transmission to remote locations |
| Jun-7-1994 |
A system and method for multiplexing a plurality of digital programs for transmission to a plurality of remote locations is claimed. An encoder is provided that first generates a plurality of subframe... |
| 5319709 |
System for broadband descrambling of sync suppressed television signals |
| Jun-7-1994 |
A television system having sync suppression scrambling and descrambling which includes in band and out of band signaling methods. The in band signaling method modulates the IF sound carrier of a premium... |
| 5319708 |
System for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency |
| Jun-7-1994 |
A system for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency. The radiofrequency TV signal or signals to be distributed undergo remodulation on at least... |
| 5206906 |
Video scrambling system |
| Apr-27-1993 |
At least one new video signal is created by using portions taken from each signal of a plurality of original video signals to create at least one new video signal, with the sequencing of the assignments... |
| 5144669 |
Method of communicating digital signals and receiver for use with such method |
| Sep-1-1992 |
A receiver (2) for selectively extracting one of two or more time division multiplexed channels of digital signals, which channel has been scrambled before multiplexing using a predetermined digital sequence... |
| 5136641 |
Scrambled video digital transmission link |
| Aug-4-1992 |
A scrambled video digital transmission link comprising an amplitude modulator, a scrambler, an amplitude demodulator and frequency conversion apparatus for providing a scrambled video signal in a baseband... |
| 5091936 |
System for communicating television signals or a plurality of digital audio signals in a standard television line allocation |
| Feb-25-1992 |
A system is provided for selectively transmitting horizontal television lines including video and digital audio components or equivalent digital data lines containing a plurality of audio program signals.... |
| 5073930 |
Method and system for receiving and distributing satellite transmitted television signals |
| Dec-17-1991 |
A television distribution system includes a frequency agile satellite transponder down converter operating in the satellite block converted frequency range, typically 950-1450 MHz, along with an IF stage... |
| 4959862 |
Active multichannel video processing hub for optimum transition from fiber to coax |
| Sep-25-1990 |
An active multichannel video processing hub which provides optinum transition from fiber to coaxial cable, provides optimum trading of bandwidth for signal to noise ratio. Fiber optic links have a very... |
| 4908859 |
Receiver access interface to service components in television channel |
| Mar-13-1990 |
A receiver interface system for enabling an operator to access different types of services in a like manner, wherein the services contain different combinations of service components received by a receiver... |
| 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... |
| 4817142 |
Restoring framing in a communications system |
| Mar-28-1989 |
A secure communications system requires special arrangements for the establishment and maintenance of framing and synchronization. A framing word is transmitted at a fixed frequency, and a key necessary... |
| 4797919 |
Receiver having an interface with a sub-system |
| Jan-10-1989 |
A receiver having an interface arrangement for connection between a television circuit and a conditional access sub-system conveys data via a bus having a four frame bus cycle period with a bit rate corresponding... |
| 4768228 |
Data acquisition device |
| Aug-30-1988 |
An apparatus for receiving, detecting and storing a series of discrete bits of data transmitted in conjunction with a video signal wherein only a portion of the transmitted data is read and saved. |
| 4744080 |
Apparatus for receiving digital sound/data information |
| May-10-1988 |
A receiver for recovering sound/data information for a number of services transmitted digitally as a packet multiplex has the data, after demodulation, applied to a first unit (3) where it is resynchronized... |
| 4716587 |
Broadband-signal broadcasting system |
| Dec-29-1987 |
A broadband signal broadcasting system comprising a circuit to encode video and audio signals forming a TV channel to be sent to a switching matrix, which is remotely operated by the subscriber; a circuit... |
| 4694489 |
Video transmission system |
| Sep-15-1987 |
A subscriber cable television system uses predominantly digital signal processing techniques and has extremely high security and an increased capacity for transmitting program and customer data to individual... |
| 4688247 |
Pay TV scrambling by audio encryption |
| Aug-18-1987 |
A subscription television distribution system provides a plurality of sources of television program channels, each of which include a video signal and an encrypted audio signal with the encrypted audio... |
| 4682360 |
Video transmission system |
| Jul-21-1987 |
A subscriber cable television system uses predominantly digital signal processing techniques and has extremely high security and an increased capacity for transmitting program and customer data to individual... |
| 4535355 |
Method and apparatus for scrambling and unscrambling data streams using encryption and decryption |
| Aug-13-1985 |
Methods and apparatus for scrambling and unscrambling a plurality of data streams having differing data, on a plurality of signal channels, are taught. The data streams may be television programs or other... |
| 4335404 |
Video signal mixer apparatus and method |
| Jun-15-1982 |
A method and apparatus for simultaneously delivering an external source of program material and the program material normally received by a television antenna to the antenna input terminals of a television... |
| 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... |
| 4253114 |
High security subscription television system employing real time control of subscriber's program reception |
| Feb-24-1981 |
A high security subscription television system which includes the feature of dynamic scrambling and descrambling of cable-connected television signals in response to real-time coded control signals. The... |
| 4205343 |
Television system transmitting enciphered data signals during field blanking interval |
| May-27-1980 |
A television system for broadcasting data simultaneously with but independently of television programs, in which digitally coded information carrying signals are superimposed or otherwise added to a video... |
| 4115662 |
One way data transmission system |
| Sep-19-1978 |
There is provided a one-way data transmission system wherein a transmitter station transmits in the form of data packs data from a plurality of channels, the said packs being time multiplexed. One channel... |
| 4081831 |
High security subscription television system employing real time control of subscriber's program reception |
| Mar-28-1978 |
A high security subscription television system which includes the feature of dynamic scrambling and descrambling of cable-connected television signals in response to real-time coded control signals. The... |
| 4058830 |
One way data transmission system |
| Nov-15-1977 |
There is provided a one-way data transmission system wherein a transmitter station transmits in the form of data packs data from a plurality of channels, the said packs being time multiplexed. One channel... |
