| 5113443 |
Method for scrambling satellite communications |
| May-12-1992 |
A secure communications system multiplexes segments of the information signal for keyed encoding and modulation onto a plurality of different carrier frequencies and/or polarizations, and transmits the... |
| 5022078 |
Television signal enhancement and scrambling system |
| Jun-4-1991 |
A television signal is distorted by passing it through a distortion amplifier which applies a Gaussian distortion curve to the signal. The curve has a maximum increase in amplitude of about 38 dB, which... |
| 4993066 |
Method for television scrambling |
| Feb-12-1991 |
A method and device for inexpensively and efficiently controlling the distribution of pay-per-access information services is disclosed including varying scrambling methods and user exchangeable cards. |
| 4992868 |
True information television (TITV) and vision system |
| Feb-12-1991 |
A learning television system will transmit only true information data which bandwidth is not dependent on screen size or resolution but rather only on novelty and movement within the image. This invention... |
| 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... |
| 4905280 |
High security videotext and videogame system |
| Feb-27-1990 |
A pay per use system allows the broadcast of television, videotext, and videogame programming all in the same system. The programming is broadcast in scrambled form with a broadcast signal imbedded in... |
| 4893248 |
Monitoring and reporting system for remote terminals |
| Jan-9-1990 |
A system is disclosed for monitoring and accumulating data indicative of viewer authorized pay per view TV programs at each of a plurality of remote terminals, wherein each remote terminal is coupled illustratively... |
| 4876718 |
Secure data packet transmission system and method |
| Oct-24-1989 |
A bit packet communication system includes a head-end having a software implemented 16 bit shaft register with a plurality of feed-forward taps and a different plurality of feed-back taps for simultaneously... |
| 4870682 |
Television scrambling system |
| Sep-26-1989 |
A signal scrambling system is provided in which the scrambler includes a transition limiter which limits the size of changes in the amplitude of the input clear signal, a device for generating a pseudo... |
| 4796297 |
Device for calculating a charge for a charged information signal with errors avoided in a report of the charge |
| Jan-3-1989 |
The amount of money which should be charged upon reception of a pay television signal or a like information signal, is calculated by a charging device comprising a calculator (25) for calculating the amount... |
| 4790010 |
Enhanced scrambling method and system for TV signals |
| Dec-6-1988 |
A television signal transmission system includes a cable head-end having a scrambler for scrambling a television signal and a subscriber decoder having an unscrambler for unscrambling the television signal... |
| 4776013 |
Method and apparatus of encryption of optical images |
| Oct-4-1988 |
A method of encoding an optical image comprises: converting the optical iamge to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; providing a master... |
| 4677685 |
Method and apparatus for downloading a code defining the channel transmission format employed in an addressable CATV system |
| Jun-30-1987 |
A tuning mode command identifying the channel transmission format being used in an addressable CATV system is transmitted via a plurality of encoded CATV channels for downloading in subscriber home terminals.... |
| 4648122 |
Community antenna television communication system |
| Mar-3-1987 |
A CATV system in which first and second terminal units are provided, connected in series via a transmission line, whereby the first transmission unit effects communiction with a control center while the... |
| 4617597 |
Compatible color television with regenerable signals |
| Oct-14-1986 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NTSC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 4568966 |
Compatible color television with regenerable signals |
| Feb-4-1986 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NTSC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 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... |
| 4550341 |
Unauthorized observation preventing device for CATV system |
| Oct-29-1985 |
In a cable television system of the type wherein a cable television signal including free and restricted television channels is subjected to selective frequency conversion at individual terminal units... |
| 4386416 |
Data compression, encryption, and in-line transmission system |
| May-31-1983 |
An in-line data compression system which reduces the number of binary bits required to transmit a given text or similar message over a data network such as Telex or TWX. The compression unit can transmit... |
| 4365267 |
Passive data monitor for use with polling pattern generator in CATV system |
| Dec-21-1982 |
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 signals... |
