| 7006632 |
Check authorization system and method |
| Feb-28-2006 |
A self-authenticating check authorization system and method includes a check that has standard bank and account information printed on the MICR line, as well as a one-way hash value that is computed based... |
| 6836844 |
Information signal copy managing method, information signal recording method, information signal output apparatus, and recording medium |
| Dec-28-2004 |
An information signal copy managing method for properly protecting the copyright of information signals and, at the same time, guaranteeing user advantages in copying information signals within a limited... |
| 6091822 |
Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment |
| Jul-18-2000 |
A technique is disclosed for preventing unauthorized playback of scrambled video/audio signals recorded on, for example, a video tape cassette, which technique includes several cooperating processes and... |
| 5912970 |
Television scrambling system |
| Jun-15-1999 |
A sync suppression, phase inversion scrambling system for a television signal is modified to improve its anti-piracy attributes SAW filters are switched during horizontal intervals to introduce scrambling... |
| 5768377 |
Video signal descrambling apparatus |
| Jun-16-1998 |
A video signal descrambling apparatus capable of restoring a scrambled video signal transmitted from a cable television or commercial broadcasting system to the original standard video signal to permit... |
| 5768376 |
Video signal scrambling apparatus |
| Jun-16-1998 |
A video signal scrambling apparatus which scrambles a video signal in a cable or commercial broadcasting system to prevent nonsubscribers from viewing the signal and the unwarranted descrambling of the... |
| 5631693 |
Method and apparatus for providing on demand services in a subscriber system |
| May-20-1997 |
An on demand services feature for the provision of video, audio, and data services for a subscription system of the CTV type, or the like. The system comprises a headend coupled to a distribution network... |
| 5539823 |
Subscription television picture scrambling and descrambling system providing compatibility with different such systems |
| Jul-23-1996 |
Video signal scrambling and descrambling methods and apparatus for a subscription TV system are provided which are compatible with other equipment operating in accordance with pre-existing modes of signal... |
| 5442700 |
Scrambling method |
| Aug-15-1995 |
A system for scrambling a television signal by designating a horizontal line number on a pseudorandom basis and then stripping the vertical and horizontal synch components from the signal at each location... |
| 5272751 |
Pay television |
| Dec-21-1993 |
In a pay television device, a horizontal sync signal, a vertical sync signal, and the like are removed from a composite video signal, and first-frequency and second-frequency signals for descrambling processing... |
| 5177787 |
Scrambler with self-calibration |
| Jan-5-1993 |
The invention is directed to an improved scrambler capable of self-calibrating output signals. In one embodiment, the scrambler provides an encoded signal along separate signal pulses. A portion of one... |
| 5166976 |
System and method for detection of a pulse within a video signal |
| Nov-24-1992 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal of a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 5161187 |
Cable television system |
| Nov-3-1992 |
A cable television system includes a transmitter and at least one receiver. In the transmitter, sync information is suppressed in amplitude to execute scrambling, and a sync width information signal and... |
| 5142575 |
Method and apparatus for improving video scrambling and employing split sync pulses |
| Aug-25-1992 |
This invention discloses a new and improved method of scrambling video signals by inversion of the video information by splitting the sync pulse into plural portions and transmitting each portion of the... |
| 5113440 |
Universal decoder |
| May-12-1992 |
A microprocessor based decoder module for television video signals which have been encoded by suppressing sync pulses and/or inverting picture video. The decoder modules generates sync restoration gates... |
| 4924498 |
Method and apparatus for improving video scrambling and employing split snyc pulses |
| May-8-1990 |
This invention discloses a new and improved method of scrambling video signals by inversion of the video information by splitting the sync pulse into plural portions and transmitting each portion of the... |
| 4885776 |
Television signal encoder with reduced transient switching effects |
| Dec-5-1989 |
A television encoding system passes a modulated video carrier through a pair of SAW filters for attenuating and reversing the phase of the carrier during horizontal intervals. Another pair of SAW filters... |
| 4817144 |
Secure TV scrambling system using framing code switching |
| Mar-28-1989 |
A television signal scrambling system scrambles by suppressing horizontal syncs and changing the phase of the video carrier during the horizontal intervals. Data is transmitted by using two different widths... |
| 4815129 |
Video encryption system |
| Mar-21-1989 |
An encrypted video distribution system includes a signal originating station which distributes television signals in a format unrecoverable by a standard television receiver. In particular, the normally... |
| 4725882 |
Scrambled video signal processor |
| Feb-16-1988 |
A scrambled video signal processor comprises an amplifier for outputting a noninverted video signal and an inverted video signal, a timing pulse controller for generating first and second timing pulses... |
| 4716588 |
Addressable subscription television system having multiple scrambling modes |
| Dec-29-1987 |
A multimode scrambling system for video signal transmission systems is described. The system provides for baseband video scrambling controlled by a central originating computer facility. The scrambling... |
| 4679078 |
High security subscription television transmission system |
| Jul-7-1987 |
A system for scrambling and descrambling a composite video signal having video program information, vertical sync pulses, and horizontal sync and blanking information includes an encoder and a decoder.... |
| 4667232 |
Synchronizing pulse restoration circuit |
| May-19-1987 |
A decoder for a television signal encrypted with randomly inverted video and randomly suppressed sync pulses includes inverting and noninverting amplifiers for inverting the inverted video and a sync pulse... |
| 4575755 |
Video encoder/decoder system |
| Mar-11-1986 |
An apparatus and method for encoding and decoding a television signal are disclosed in which the horizontal sync pulses and the first section of the video signal are inverted, and the inverted horizontal... |
| 4527195 |
Apparatus for encoding and decoding information |
| Jul-2-1985 |
Apparatus for encoding and decoding information. Multiple scrambling techniques are provided to prevent unauthorized reception of a television picture signal. A first mode of scrambling provides for shifting... |
| 4396947 |
Apparatus for encoding of information |
| Aug-2-1983 |
A composite video signal containing an information portion and a synchronization pulse is encoded by shifting the level of the synchronization pulse and also by inverting the information portion. The encoding... |
| 4340906 |
Video signal coding by video signal polarity reversal on the basis of brightness level comparison |
| Jul-20-1982 |
A method and means for coding and decoding video signals by repetitive video signal polarity reversal includes the steps of comparing the brightness level of a predetermined time period of the video signal... |
| 4222068 |
Subscription television apparatus and methods |
| Sep-9-1980 |
Subscription apparatus and methods wherein an encoder begins inversion of a video signal during the last horizontal trace line of a randomly selected vertical interval and continues to invert trace lines... |
| 4075660 |
Pay television system with synchronization suppression |
| Feb-21-1978 |
Reference pulses of opposite polarity to the horizontal sync pulses are added to the composite television signal just preceeding each horizontal sync pulse. The video portion of the signal is inverted... |
