| 4471379 |
Codified field polarity television system |
| Sep-11-1984 |
There is disclosed herein a television system wherein television signals are scrambled or otherwise encoded at the transmitting facility and then unscrambled or decoded at the receiving facility, typically... |
| 4358672 |
Pay per view television control device |
| Nov-9-1982 |
A method and apparatus for providing access to an electrically controlled service for perdetermined periods of time employs a dual magnetically striped record medium encoded in a CRB format with data indicative... |
| 4245246 |
Pay TV system |
| Jan-13-1981 |
An apparatus for coding video information arranged in a plurality of lines comprises means for selectively inverting video information in groups of lines. A random timing device controls the number of... |
| 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... |
| 4085422 |
Fee-charging apparatus for television sets |
| Apr-18-1978 |
An apparatus with specified video carrier jamming for disturbing the image on a screen of a TV receiver for Fee-charged Viewing Thereof comprises an oscillating circuit, a switch means, a feeding device... |
| 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... |
| 4012583 |
Pay TV control system |
| Mar-15-1977 |
A simple recyclable key and locking system for enabling a pay TV converter is disclosed. The key is a small tag such as might be attached to the room key of a hotel room and is to be turned in with the... |
