| 6597789 |
Video/audio scrambling with single conversion tuners |
| Jul-22-2003 |
Conventional decoding systems for scrambled audio-visual signals are improved by providing a dual-side local oscillator that functions as a high-side oscillator if the incoming RF signal is unscrambled... |
| 6519340 |
Method and apparatus for encryption using partial information |
| Feb-11-2003 |
A method and apparatus of encrypting optical images using binarization or phase only information is presented with a number of ways to secure the image also being provided. An image to be encrypted is... |
| 5463656 |
System for conducting video communications over satellite communication link with aircraft having physically compact, effectively conformal, phased array antenna |
| Oct-31-1995 |
A system architecture and communication methodology for significantly reducing the size of an aircraft antenna required to provide full broadcast quality video communications with an aircraft via a satellite... |
| 5450454 |
Coding and decoding a modulated radio frequency signal |
| Sep-12-1995 |
The invention relates to a method for coding and decoding a radio frequency signal, modulated with a TV program or other message and transmitted from a transmitting center to a plurality of receiver locations,... |
| 5446795 |
Universal decoder for television signal scramble systems |
| Aug-29-1995 |
A universal decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one... |
| 5430798 |
Scrambled TV-IF signal transmission system |
| Jul-4-1995 |
A cable TV signal transmission system comprising a Nyquist filter carrier recovery circuit, a mixer, a level shifter and a pre-emphasis circuit for transmitting scrambled TV-IF signals on an FM or digital... |
| 5311543 |
Television transmission system using two stages of spead-spectrum processing |
| May-10-1994 |
A 2-stage SS (spread-spectrum) system for transmitting a coded TV signal, said coded signal consisting of first components requiring near-perfect transmission and second components for which somewhat imperfect... |
| 5301245 |
System for transmitting a commercial program in a CATV system |
| Apr-5-1994 |
A CATV system includes a broadcasting station, a satellite, and a local center. Scrambled television signals transmitted from the broadcasting station to the local center through the satellite are descrambled... |
| 5235640 |
Master decoder for television signal scramble systems |
| Aug-10-1993 |
A master decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one or... |
| 5056139 |
Methods and apparatus for electronically limiting broadcast communication |
| Oct-8-1991 |
A communication receiver (12) is provided having a radio frequency section (20) for receiving a communication signal (14) and a corresponding code signal (16) carrying an identification code. An intermediate... |
| 5052047 |
Modulator-remodulator with common local oscilator |
| Sep-24-1991 |
A channel converter system includes a local oscillator for converting an input RF television channel frequency signal to an intermediate frequency and for remodulating the intermediate frequency signal... |
| 4951313 |
Scrambled frequency modulated video signal transmission system |
| Aug-21-1990 |
A scrambled frequency modulated video signal transmission system is provided with a headend station having a DC coupled amplitude demodulator for removing the amplitude modulation of a scrambled amplitude... |
| 4864613 |
Broadband converter/descrambler interface for cable TV |
| Sep-5-1989 |
A broadband converter/descrambler intended for use with cable-ready video appliances (e.g., a VCR or television) receives signals from a cable TV drop. The cable TV signals are characterized by a plurality... |
| 4827509 |
CATV receiver |
| May-2-1989 |
In a CATV receiver for receiving scrambled television signal, then de-scrambling it to original television signal responsive to key pulses contained in the scrambled television signal, and then outputting... |
| 4823387 |
Television tuning system with provisions for tuning RF signals with scrambled video information |
| Apr-18-1989 |
A tuning system for tuning non-standard frequency RF signals which utilizes searches for non-standard RF signals by examining both a synchronization component and an AFT signal at each of a successive... |
| 4771456 |
Cable television channel selector/descrambler for use with cable-ready video applicances |
| Sep-13-1988 |
A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjunction with a cable television system providing... |
| 4589016 |
FM television signal receiving circuit |
| May-13-1986 |
A receiving circuit for receiving an FM-modulated television signal with an energy dispersal signal superposed thereon is used for a television receiver for receiving the FM-modulated television signal.... |
| 4575753 |
Method of and apparatus for scrambling and decoding television and similar signals with wobbulating trapping |
| Mar-11-1986 |
Television or similar picture scrambling or the like wherein narrow trapping of the visual carrier is effected with one-direction FSK-FM modulated wobbulation of the visual carrier, preferably alternately... |
| 4518993 |
Television signal receiving system |
| May-21-1985 |
A television receiver for receiving standard television channel signals and a scrambled television channel signal includes a channel selector which selects one of the television channel signals, a tuner... |
| 4509210 |
Television receiver adaptable for descrambler module |
| Apr-2-1985 |
A television receiver is adapted for use of standardized plug-in descramblers which are coupled to the receiver by a connector. The connector is accessible from the exterior of the housing of the receiver... |
| 4325078 |
Pay per view television control device |
| Apr-13-1982 |
An apparatus and method for providing limited access to broadcast television programming in a CATV System wherein each television subscriber is provided with a converter for converting broadcast television... |
| 4286288 |
Apparatus and method for tamper resistant channel attenuation in subscription television converter |
| Aug-25-1981 |
A tamper resistant subscription television converter is made by connecting a bandstop filter in the Radio Frequency circuit of the converter. The filter, for attenuating one or more preselected subscription... |
| 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... |
| 4130833 |
Pay television system |
| Dec-19-1978 |
The standard composite television signal is modulated onto an intermediate frequency carrier signal. The so-modulated signal is applied to the input of a first and second frequency converter for conversion... |
| 4109281 |
Terminal device for CATV |
| Aug-22-1978 |
In a CATV system, a received signal band containing video channels and a data signal at a selected frequency is successively converted in frequency so as to provide a chosen video signal at the frequency... |
| 4091413 |
Security system for pay-TV channel |
| May-23-1978 |
A system for securing a pay-TV channel by coherently moving the RF components of the channel (with or without an encoding signal) beyond the AFC holding range of commercially available tuners. The system... |
| 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... |
| 4079419 |
Method and apparatus for transmitting and receiving additional information in a television signal |
| Mar-14-1978 |
Identification of a program being transmitted is encoded digitally on a sub-carrier modulated on the sound carrier of a television signal with each elementary code group occupying a television field interval,... |
| 3997718 |
Premium interactive communication system |
| Dec-14-1976 |
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 with service... |
