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| Number | Title | Issue Date |
| 7352863 | Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on a illegal copy. The enhancement in one version include a negative going waveform that appears to the television receiver or videotape recorder to be a ... | 04/01/2008 |
| 7215774 | Video data transfer control system and method A video data transfer control system allowing secure protection of video data from unauthorized copying is disclosed. A scrambling key used to scramble video data is stored in a key register and a new scrambling key is stored in a register. At the timing of a vertic... | 05/08/2007 |
| 7113597 | System and method for protection of video signals A method and system are provided for protecting an analog video signal sent from a video signal source to a video display enabled to receive a protected video signal. The method includes sending a string of bit values in an encrypted format from the video display to... | 09/26/2006 |
| 7110042 | Synchronization signal decoder and associated method The invention relates to a synchronization signal decoder and associated method for improving digital image display. A composite video stream includes a distortion compliant signal and a synchronization signal. A level shift circuit is adapted to shift a voltage lev... | 09/19/2006 |
| 7065211 | Signal reproducing/recording/transmitting method and apparatus and signal recording medium A video signal reproduction system for receiving a video signal transmitted via a satellite communication link at a receiving device. A copy permission indicator is inserted in the received video signal. The copy permission indicator is generated on the basis of cop... | 06/20/2006 |
| 7050698 | Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion A modified Colorstripe™ copy protection process utilizes a basic anti-copy protection (ACP) signal that causes attenuation of a video signal, wherein, in one embodiment, the process modifies (lowers) the level of a front porch portion and adds an incorrect color s... | 05/23/2006 |
| 6980653 | Signal reproducing/recording/transmitting method and apparatus and signal record medium A system for providing a copy permission indicator in a video signal. The copy permission indicator is generated on the basis of copy management information that has been appended to the video signal and detected by the system. The indicator is in the form of a mult... | 12/27/2005 |
| 6836549 | Method and apparatus for synthesizing and reducing the effects of video copy protection signals 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 a particular pulse position shifting, modulation, etc., of AGC, n... | 12/28/2004 |
| 6424716 | Method and apparatus for improved horizontal and vertical overlay signals for greater concealment in modern TV sets 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 non-interlaced tearing pattern when viewed by an unaut... | 07/23/2002 |
| 6421497 | Method for locating copy protection pulses within selected video lines of a video signal 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 subsequent video tape recording of the video signal s... | 07/16/2002 |
| 6285765 | Method and apparatus for reducing effects of copy protection of composite video signal 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 that the viewer's enjoyment of the picture is severe... | 09/04/2001 |
| 6173109 | Method and apparatus for removing or defeating effects of copy protection signals from a video signal 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 subsequent video tape recording of the video signal s... | 01/09/2001 |
| 6028941 | Method for the defeat of illegal descramblers sensitive to the edges of sync in scrambled video 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 which prevent a standard receiver from detecting ... | 02/22/2000 |
| 6005839 | Data transmitting method, data recording apparatus, data record medium and data reproducing apparatus 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 circuit 17 and appending synchronization signals b... | 12/21/1999 |
| 6002830 | Method and apparatus for removing or defeating effects of copy protection signals from a video signal 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 subsequent video tape recording of the video signal s... | 12/14/1999 |
| 5978480 | System for scrambling and descrambling video signals by altering synchronization patterns 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 signal, an apparatus for recovering the composite vid... | 11/02/1999 |
| 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 scrambling The switching is a function of a mode signal and f... | 06/15/1999 |
| 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 permit subscribers to enjoy the scrambled signal and to prov... | 06/16/1998 |
| 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 of the signal. The scrambling apparatus scrambles the video ... | 06/16/1998 |
| 5748733 | Method and apparatus to reduce effects of certain copy protection purses within a video signal 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 the television picture, just prior to the horizontal... | 05/05/1998 |
| 5737417 | Videotape anti-copying encryption scheme 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 with each field, during the process of prepa... | 04/07/1998 |
| 5661801 | Method and apparatus for stabilizing and brightening prerecorded TV signals encoded with copy protection 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 played on a VCR and viewed on a t.v. monitor. In a fi... | 08/26/1997 |
| 5651065 | Insertion of supplemental burst into video signals to thwart piracy and/or carry data 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 horizontally sync suppressed scrambled signals by de... | 07/22/1997 |
| 5583936 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions 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 the television picture, just prior to the horizontal... | 12/10/1996 |
| 5301033 | Circuit for preventing false detection of video sync pulses in a video signal which also contains copy guard signals 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 circuitry which is responsive to vertical sync ... | 04/05/1994 |
| 5287409 | Method and apparatus for frustrating vertical interval detection in scrambled television signals 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 pulse information is inserted into the sound carrier d... | 02/15/1994 |
| 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 which is transmitted along with the aperiodically inverted v... | 11/24/1992 |
| 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 of the sync pulse at a predetermined level. This improves t... | 08/25/1992 |
| 5125028 | Television signal scrambling method and apparatus 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 sync pulse preceding the vertical blanking interval... | 06/23/1992 |
| 4951315 | Video signal noise evaluation and removal circuit 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 and removing unwanted noise and noise pulses in a base... | 08/21/1990 |
| 4924498 | Method and apparatus for improving video scrambling and employing split snyc 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 of the sync pulse at a predetermined level. This improves t... | 05/08/1990 |
| 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 scrambling of each field of a video changes on a per field basis... | 12/29/1987 |
| 4521809 | Method and apparatus for controlling access to selected television programs 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 rate than the contained horizontal synchronizing ... | 06/04/1985 |
| 3958077 | Picture transmission systems 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 sequential lexicographic scans with eliminat... | 05/18/1976 |
