| 4471380 |
Scrambling and descrambling of television signals for subscription TV |
| Sep-11-1984 |
Subscription TV premium programming may be encoded with tagging information as by transmitting a tagging pulse during at least one horizontal line interval of each picture field in addition to pulses which... |
| 4460922 |
Memory select system for an STV decoder |
| Jul-17-1984 |
A subscription television system includes means broadcasting a scrambled television signal encoded with p-bit program and subscriber authorization codes and m-bit memory write and read codes. Each subscriber... |
| 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... |
| 4410911 |
Multiple signal transmission method and system, particularly for television |
| Oct-18-1983 |
A method and system for scrambling a plurality of input signals for secure transmission thereof, as well as various methods and systems for television transmission, are disclosed. The disclosed scrambling... |
| 4408225 |
Subscription television decoder |
| Oct-4-1983 |
A decoder is responsive to a decode authorization signal for unscrambling a broadcast RF television signal having randomly suppressed horizontal blanking and synchronization pulses. The decoder comprises... |
| 4398216 |
Multiple signal transmission method and system, particularly for television |
| Aug-9-1983 |
A method and system for scrambling a plurality of input signals for secure transmission thereof, as well as various methods and systems for television transmission, are disclosed. The disclosed scrambling... |
| 4390898 |
Scrambling and unscrambling video signals in a pay TV system |
| Jun-28-1983 |
A scrambler scrambles a video signal by replacing its vertical intervals with dummy video signal lines, and separately providing information relating to the timing of the replaced vertical intervals. This... |
| 4388643 |
Method of controlling scrambling and unscrambling in a pay TV system |
| Jun-14-1983 |
Scrambling of a video signal in a pay TV system is effected in dependence upon a first variable which is changed recurrently, e.g. monthly, and a second variable which changes from field to field. For... |
| 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... |
| 4307416 |
Television signal modification apparatus |
| Dec-22-1981 |
Apparatus is disclosed which modifies a video signal (in the video frequency range) for scrambling (encoding) and unscrambling (decoding) video signals for television pictures. |
| 4225884 |
Method and system for subscription television billing and access |
| Sep-30-1980 |
A subscription television system and method in which billing information regarding programs actually viewed by a subscriber of the system is accumulated over non-dedicated telephone lines. A scrambled... |
| 4163255 |
Billing method and system for a subscriber of a pay television system |
| Jul-31-1979 |
Each decoder has a random access memory storing program code numbers, a security number, a customer identification number, and program identification numbers utilized for billing purposes. Communication... |
| 4163254 |
Method and system for subscription television billing and access |
| Jul-31-1979 |
A subscription television system and method in which billing information regarding programs actually viewed by a subscriber of the system is accumulated over non-dedicated telephone lines. A scrambled... |
| 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... |
| 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... |
| 4112464 |
Subscription TV decoder logic system |
| Sep-5-1978 |
A subscription TV decoder for processing encoded audio and video signals utilizes decoder enabling signals which are transmitted as audio subcarriers and have data and address portions thereof. The decoder... |
| 4068264 |
Pay television system utilizing binary coding |
| Jan-10-1978 |
At the sending end randomly generated binary code number signals are inserted into predetermined lines of the vertical retrace interval. The code number signals are also processed in accordance with a... |
