Matches 1 - 38 out of 38


Match Document Document Title
8644379 De-interlacing method and method of compensating a de-interlaced pixel  
A luminance compensating method of compensating a de-interlaced pixel in a current block of a current frame with reference to a reference block of a reference frame is provided. First, calculate...
8320564 Encrypted signal detection circuit and video device using the same  
A video device includes a video signal generation circuit, an encrypted signal detection circuit and a central processing unit (CPU). The encrypted signal detection circuit detects encrypted...
7319755 Image altering apparatus and method for providing confidential viewing of a fundamental display image  
An image altering apparatus which provides confidential viewing of a video display by means of time multiplexing the fundamental display image with a color-inverted image thereof on a...
7006632 Check authorization system and method  
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...
6091822 Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment  
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...
5912970 Television scrambling system  
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...
5768376 Video signal scrambling apparatus  
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...
5768377 Video signal descrambling apparatus  
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...
5631693 Method and apparatus for providing on demand services in a subscriber system  
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...
5539823 Subscription television picture scrambling and descrambling system providing compatibility with different such systems  
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...
5442700 Scrambling method  
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...
5272751 Pay television  
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...
5177787 Scrambler with self-calibration  
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...
5166976 System and method for detection of a pulse within a video signal  
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...
5161187 Cable television system  
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...
5142575 Method and apparatus for improving video scrambling and employing split sync pulses  
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...
5113440 Universal decoder  
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...
4885776 Television signal encoder with reduced transient switching effects  
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...
4817144 Secure TV scrambling system using framing code switching  
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...
4815129 Video encryption system  
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...
4725882 Scrambled video signal processor  
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...
4716588 Addressable subscription television system having multiple scrambling modes  
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...
4679078 High security subscription television transmission system  
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...
4667232 Synchronizing pulse restoration circuit  
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...
4575755 Video encoder/decoder system  
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...
4527195 Apparatus for encoding and decoding information  
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...
4396947 Apparatus for encoding of information  
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....
4340906 Video signal coding by video signal polarity reversal on the basis of brightness level comparison  
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...
4222068 Subscription television apparatus and methods  
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...
4075660 Pay television system with synchronization suppression  
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...
3924059 Pay television systems  
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...
3824332 PAY TELEVISION SYSTEM  
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...
3801732 METHOD AND APPARATUS FOR SCRAMBLED TELEVISION  
A method of rendering television transmissions unintelligible to unauthorized television receivers in which both video and synchronizing information, typically, is rendered alternately useable and...
3527877 CODED VIDEO SYSTEMS WITH SIGNAL PHASE INVERSION  
3484544 FREQUENCY INTERLACING OF MULTI-VIDEO PROGRAMS  
3440338 SUBSCRIPTION TELEVISION SYSTEM  
3439113 SUBSCRIPTION TELEVISION COMMUNICATION SYSTEM  
3242258 Subscription television system having generation of synchronizing signals at the receiver  

Matches 1 - 38 out of 38