| 6654887 |
Steganography decoding methods employing error information |
| Nov-25-2003 |
Media content, such as imagery (including video) and audio, can be encoded to convey hidden information (steganographic encoding) for a variety of purposes, including communication of auxiliary information... |
| 6425082 |
Watermark applied to one-dimensional data |
| Jul-23-2002 |
In the process of embedding watermark information in one-dimensional source data, first spread one-dimensional data x(t) is generated by subjecting one-dimensional source data s(t) to spectrum-spreading... |
| 6292567 |
Sync suppression television security system with addressable sync restoration |
| Sep-18-2001 |
A television transmission security system, including scrambling a television signal by suppressing at least one of the horizontal sync pulse and vertical blanking interval of the television signal; transmitting... |
| 6272634 |
Digital watermarking to resolve multiple claims of ownership |
| Aug-7-2001 |
A method and apparatus for digital watermarking to resolve multiple claims of ownership is disclosed. According to one embodiment of the invention, a first watermark requiring the host data for detection... |
| 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... |
| 5303295 |
Enhanced versatility of a program control by a combination of technologies |
| Apr-12-1994 |
A program control system for controlling access to premium programming and/or premium channels comprises a program control apparatus which may incorporate one or more subscriber modules. The subscriber... |
| 5282248 |
Time limited signal conduction system |
| Jan-25-1994 |
A time limited signal conduction switch 13 powered by an internal energy source 16 with a given life span. A lithium inorganic cell 16 is used as the internal energy source and is coupled to a specially... |
| 5249228 |
Cable television signal scrambling system |
| Sep-28-1993 |
In a cable television system an interferer signal is inserted into the video signal for scrambling purposes except during a vertical blanking reference interval containing a reference signal for use by... |
| 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... |
| 5233652 |
Selective off-premises jamming for premium CATV service |
| Aug-3-1993 |
Selective off-premises jamming for premium CATV service is provided by using continuously running fixed-frequency oscillators (19.1-19.n) for generating jamming signals at each of a plurality of distribution... |
| 5208854 |
Picture carrier controlled automatic gain control circuit for cable television interdiction or jamming apparatus |
| May-4-1993 |
An off-premises i.e. a negative or positive trap, jamming cable television or interdiction system, includes a picture carried controlled automatic gain control circuit. A broadband television signal output... |
| 5068893 |
Television signal processing network for subscription television jamming signals |
| Nov-26-1991 |
Networks which remove the jamming signal from the television signal supplied to subscribers for a premium T.V. channel in a cable (CATV) or other subscription television system utilizes surface accoustic... |
| 5027399 |
Signal switching apparatus |
| Jun-25-1991 |
Apparatus is provided for switching traps in and out of a cable television signal path. A plurality of double pole double throw switches is connected in series with the signal path. Each switch has a first... |
| 4939779 |
Temperature compensated trap filter |
| Jul-3-1990 |
A temperature stable television signal trap filter device is easily produced in a wide range of temperature compensating values using commercially available components for securing pay television systems.... |
| 4903297 |
Restricted access television transmission system |
| Feb-20-1990 |
A Television Signal Transmission Security System which provides a higher degree of security then previously possible by utilizing encoding and decoding technology which effectively prevents pirating by... |
| 4841569 |
Secure video distribution system |
| Jun-20-1989 |
A video distribution system (e.g., CATV or MATV) employs at least one channel having a reception-defeating jamming signal which changes frequency periodically or, preferably, randomly. The signal originating... |
| 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... |
| 4825467 |
Restricted access television transmission system |
| Apr-25-1989 |
A Television Signal Transmission Security System which provides a higher degree of security then previously possible by utilizing encoding and decoding technology which effectively prevents pirating by... |
| 4748667 |
Jamming signal scrambling and descrambling systems for CATV |
| May-31-1988 |
Scrambling and descrambling systems utilizing jamming signals provide improved pictures with minimal distortion due to ghosts and artifacts. The television signal is combined with a jamming signal or signals... |
| 4633309 |
Cable television master/slave decoder control |
| Dec-30-1986 |
A method of controlling the operation of slave decoders in a cable television distribution system having a central control computer; in which each subscriber location having a slave decoder also has a... |
| 4623919 |
Method and system for controlling access to transmitted modulated electromagnetic wave carried information |
| Nov-18-1986 |
A method and system for making possible enforceable subscription available electromagnetically transmitted communications. Mailable receiver tuning components are described which serve to make receivers... |
| 4623918 |
Pay television system utilizing multi-frequency passive filters |
| Nov-18-1986 |
Selected interference frequency signals are inserted into the video or RF signal at the transmitter for scrambling purposes, either singly or in pairs. At the receiving end the signals are decoded by use... |
| 4580161 |
Cable television subscriber control system including addressable filters having a variable pole |
| Apr-1-1986 |
A filter for use in a cable television system for filtering out a given channel comprising a two pole filter, said filter including one pole which is fixed at the center frequency to be tuned out and a... |
| 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... |
| 4567516 |
Special program decoding of scrambled subscription television transmissions |
| Jan-28-1986 |
This disclosure is concerned with a limited time operative decoder for special scrambled television program transmissions involving a voltage source for energizing the decoder of limited time effectiveness... |
| 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... |
| 4272791 |
Method and apparatus for video recording |
| Jun-9-1981 |
Apparatus for connecting a cable television system utilizing a multi-channel converter having a preselector switch and a preselected converter very high frequency output signal to a video cassette recorder... |
| 4268860 |
Television subscriber apparatus |
| May-19-1981 |
This disclosure is concerned with modulating the tuning of a picture carrier frequency trap to insure audible distortion of the sound signal in a subscriber television system irrespective of variations... |
| 4222067 |
Tamper-resistant television signal scrambling |
| Sep-9-1980 |
A method and apparatus for blocking the reception of a subscription television program while substituting a replacement program at a blocked receiver, provide security against detuning an unauthorized... |
| 4222066 |
CATV Subscription service control device and attenuator therefor |
| Sep-9-1980 |
A CATV subscription service control device has a switched buffer to prevent jamming signals from a switched attenuator from propagating throughout the system. The attenuator uses mutual inductance to achieve... |
| 4099203 |
Television signal scrambling with introduction of replacement program signals |
| Jul-4-1978 |
A method and apparatus are provided for blocking the reception of a subscription television program signal while substituting for the blocked signal a replacement program signal which is received by the... |
| 4097894 |
Secured scramble decoder filter |
| Jun-27-1978 |
A secured scramble decoder filter comprised of a narrow band filter assembled on a fragile substrate and mounted in a housing wich automatically destroys the filter when any tampering is attempted. The... |
| 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... |
| 4074311 |
Television security system |
| Feb-14-1978 |
A system for subscription TV security which is comprised of a scramble signal generator which adds a modulated RF carrier signal to the TV channel transmission. Preferably the frequency of the scramble... |
| 3989887 |
Swept frequency trap jammer for secure television system |
| Nov-2-1976 |
A jamming circuit for making unusable the television signal of a preselected channel includes a bridged T-trap filter having a pair of high Q circuits adapted to be tuned to the carrier frequency of the... |
