| 6836549 |
Method and apparatus for synthesizing and reducing the effects of video copy protection signals |
| Dec-28-2004 |
A method and apparatus for defeating copy protection signals in a video signal, and also for providing copy protection signals for a video signal, is disclosed. The defeat technique generally utilizes... |
| 6424716 |
Method and apparatus for improved horizontal and vertical overlay signals for greater concealment in modern TV sets |
| Jul-23-2002 |
Video signals are scrambled by position modulating or switching between two types of modified horizontal sync pulses. These modified horizontal pulses are modulated or switched at a rate that causes a... |
| 6421497 |
Method for locating copy protection pulses within selected video lines of a video signal |
| Jul-16-2002 |
In a known copy protection process for preventing recording of video signals, pseudo sync and AGC pulses are present on predetermined lines within the blanking intervals of the video signal so that any... |
| 6285765 |
Method and apparatus for reducing effects of copy protection of composite video signal |
| Sep-4-2001 |
Copy protection for composite video signals is well known. Copy protection, while it does not prohibit making a copy per se, does render any copy (recording) of the video signal relatively unviewable so... |
| 6173109 |
Method and apparatus for removing or defeating effects of copy protection signals from a video signal |
| Jan-9-2001 |
In a known copy protection process for preventing recording of video signals, pseudo sync and AGC pulses are present on predetermined lines within the blanking intervals of the video signal so that any... |
| 6028941 |
Method for the defeat of illegal descramblers sensitive to the edges of sync in scrambled video |
| Feb-22-2000 |
A method for defeating illegal receivers sensitive to the edges of synchronization signals in a scrambled video signal is provided. The scrambled video signal includes synchronization signals having levels... |
| 6005839 |
Data transmitting method, data recording apparatus, data record medium and data reproducing apparatus |
| Dec-21-1999 |
A data transmitting method for preventing direct copying of digital bi-level signals. When processing input digital data from an input terminal 11 by circuits 13 to 16, modulating the data by a modulation... |
| 6002830 |
Method and apparatus for removing or defeating effects of copy protection signals from a video signal |
| Dec-14-1999 |
In a known copy protection process for preventing recording of video signals, pseudo sync and AGC pulses are present on predetermined lines within the blanking intervals of the video signal so that any... |
| 5978480 |
System for scrambling and descrambling video signals by altering synchronization patterns |
| Nov-2-1999 |
A system for scrambling and descrambling a composite video signal having content and an associated composite synchronization signal. The system comprises an apparatus for scrambling the composite video... |
| 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... |
| 5748733 |
Method and apparatus to reduce effects of certain copy protection purses within a video signal |
| May-5-1998 |
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan portion of... |
| 5737417 |
Videotape anti-copying encryption scheme |
| Apr-7-1998 |
Anti-copying protection for video material is provided wherein at least one high-amplitude pulse is inserted into various lines of the video signal, in and immediately preceding the vertical interval associated... |
| 5661801 |
Method and apparatus for stabilizing and brightening prerecorded TV signals encoded with copy protection |
| Aug-26-1997 |
A method and apparatus are provided for preventing the existence of pseudo-sync pulses and added AGC pulses in an original video tape with copy protection from producing a poor t.v. picture when simply... |
| 5651065 |
Insertion of supplemental burst into video signals to thwart piracy and/or carry data |
| Jul-22-1997 |
A video signal is modified to include a supplemental burst signal on at least some of the scan lines for each frame. The supplemental burst signals are used to prevent a pirate decoder from descrambling... |
| 5583936 |
Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
| Dec-10-1996 |
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan portion of... |
| 5301033 |
Circuit for preventing false detection of video sync pulses in a video signal which also contains copy guard signals |
| Apr-5-1994 |
A circuit for preventing the false detection of vertical sync pulses included in a video signal which also includes copy guard signals inserted in predetermined intervals thereof, including signal generating... |
| 5287409 |
Method and apparatus for frustrating vertical interval detection in scrambled television signals |
| Feb-15-1994 |
In order to defeat pirate descramblers that detect the occurrence of a vertical blanking interval from a gap in timing data provided on the sound carrier of a scrambled television signal, diversionary... |
| 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... |
| 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... |
| 5125028 |
Television signal scrambling method and apparatus |
| Jun-23-1992 |
A television scrambling system of the GSS type includes a false key signal to defeat pirate decoders. The false key is placed approximately one half a horizontal line period following the last horizontal... |
| 4951315 |
Video signal noise evaluation and removal circuit |
| Aug-21-1990 |
By extracting a high frequency A.C. signal from the tips of the horizontal sync pulses, and sensing for the presence of pulses occurring at abnormal times, an extremely simple method of both measuring... |
| 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... |
| 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... |
| 4521809 |
Method and apparatus for controlling access to selected television programs |
| Jun-4-1985 |
In order to control subscriber access to selected television programs in a CATV system, nonstandard horizontal synchronizing pulses, having a greater amplitude and either a higher or lower pulse repetition... |
| 3958077 |
Picture transmission systems |
| May-18-1976 |
In a television or other picture transmission the picture is scanned in a random or pseudo-random manner enabling picture analysis and transmission within band widths considerably smaller than with conventional... |
