| 5319706 |
Synchronizing circuit |
| Jun-7-1994 |
When a specific signal (such as copy guard signal) is added between horizontal synchronizing signals in a composite synchronizing signal, and the addition period of the specific signal is defined in a... |
| 5262874 |
Method and apparatus for recording and replaying field-length-modulated video signals |
| Nov-16-1993 |
Copy protected video signals employing field-length-modulation (FLM) are effectively recorded by a VCR by stripping the rate-varying vertical sync pulses from the FLM video and reinserting constant rate... |
| 5194965 |
Method and apparatus for disabling anti-copy protection system in video signals |
| Mar-16-1993 |
A method and apparatus for disabling the effect of copy-protect signals placed in a recording video signals which is based on differences in the characteristics of television and VCR circuitry. Copy-protect... |
| 5182771 |
Anti-taping method and apparatus for a multiplexed analog component television system |
| Jan-26-1993 |
An apparatus for transmitting a multiplexed analog component television signal. The apparatus includes a signal source generator for generating a signal source having information regarding the number of... |
| 5179452 |
Method for producing copy protected recorded videotape having uncopyable vertical synchronizing signal partition |
| Jan-12-1993 |
A copy protection arrangement for pre-recorded videotape cassettes. The invention includes both a method of protecting and a protected videotape cassette. Copy protection is provided by recording on at... |
| 5157510 |
Method and apparatus for disabling anti-copy protection system in video signals using pulse narrowing |
| Oct-20-1992 |
A method and apparatus for disabling the effect of copy-protect signals added to a video signal using differences in the characteristics of television and VCR circuitry. Copy-protect signals as described... |
| 5155767 |
Method and apparatus for manufacturing pre-recorded videotape programs |
| Oct-13-1992 |
A method and apparatus for manufacturing a videotape from a video signal so as to inhibit the making of acceptable copies thereof. The video portion of a video signal from a video source is looped through... |
| 5133008 |
Image signal processing device |
| Jul-21-1992 |
An image signal processing device used in image signal reproducing devices such as laser vision disk players and video tape recorders for processing an image signal including a copy guard signal includes... |
| 5130810 |
Method and apparatus for processing a video signal so as to prohibit the making of acceptable videotape recordings |
| Jul-14-1992 |
A video signal is modified so that a television receiver still produces a normal color picture from the modified signal, whereas a videotape recording of this signal produces generally unacceptable pictures.... |
| 5121206 |
Clock signal generator for video signal capable of generating a stable clock signal |
| Jun-9-1992 |
A clock signal generator circuit includes a synchronous signal separation circuit for separating a synchronous signal from an input video signal; a phase-locked loop (PLL) circuit for generating a clock... |
| 5034981 |
Anti-copying video signal processing |
| Jul-23-1991 |
Counting circuitry in the vertical synchronizing circuit of a video receiver is prevented from generating vertical control signals at a fixed, standard periodicity when the video signal transmitted to... |
| 5016272 |
Home video system |
| May-14-1991 |
A home video system comprising a headend system, a transmission channel, a trap, a converter, descrambling equipment, receiving equipment, and requesting equipment. The headend equipment includes program... |
| 5003590 |
Encoding an optical video disc to inhibit video tape recording |
| Mar-26-1991 |
A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a video... |
| 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... |
| 4914694 |
Modifying a television signal to inhibit recording/reproduction |
| Apr-3-1990 |
A composite television signal is modified to inhibit the reproduction of an unauthorized recording thereof by conventional video recorders but enable the display of a video picture therefrom on a television... |
| 4912691 |
Video stabilizer |
| Mar-27-1990 |
This invention is directed at a video stabilizer which removes non standard AGC pulses added to a video signal for inhibiting the making of acceptable video recordings of the video signal which includes... |
| 4907093 |
Method and apparatus for preventing the copying of a video program |
| Mar-6-1990 |
A video signal is modified so that a television receiver will still provide a normal color picture but which a video tape recorder will detect and prohibit its being recorded. A plurality of ordered pairs... |
| 4888649 |
Noncopiably recorded videotape and noncopiably videotape-recording system |
| Dec-19-1989 |
A video tape on which a series of video signal to be reproduced as a series of visible images by a video signal reproducing apparatus is recorded together with disturbing signals for disturbing a video... |
| 4819098 |
Method and apparatus for clustering modifications made to a video signal to inhibit the making of acceptable videotape recordings |
| Apr-4-1989 |
A video signal is modified so that a television monitor/receiver still produces a normal picture from the modified signal, whereas a videotape recording of this signal produces generally unacceptable pictures.... |
| 4695901 |
Method and apparatus for removing pseudo-sync and/or agc pulses from a video signal |
| Sep-22-1987 |
Added pseudo-sync pulses and AGC pulses are removed from a video signal to enable acceptable video recording thereof. The added signals previously interfered with acceptable video recording of the video... |
| 4691354 |
Vertical interval data blanker |
| Sep-1-1987 |
A stretched vertical interval pulse is developed by a transistorized integrating circuit supplied with a composite sync signal applied to a data recovery and unscrambler circuit in a television decoder.... |
| 4631603 |
Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof |
| Dec-23-1986 |
A video signal is modified so that a television receiver will still provide a normal color picture from the modified video signal while a videotape recording of the modified video signal produces generally... |
| 4577216 |
Method and apparatus for modifying the color burst to prohibit videotape recording |
| Mar-18-1986 |
A method and apparatus which modifies a color video signal in such a manner that a conventional television receiver produces a normal color picture from the modified signal, whereas a videotape recording... |
| 4571642 |
Method of and apparatus for modifying a video signal to prevent the unauthorized recording and reproduction thereof |
| Feb-18-1986 |
An apparatus for modifying a video signal to protect the unauthorized recording and reproduction thereof is disclosed. In accordance with the invention, the video signal is modified in such a manner that... |
| 4509082 |
Circuit arrangement for generating the vertical synchronizing information in a magnetic video tape apparatus |
| Apr-2-1985 |
In magnetic video-tape equipment of the helical-scan type the vertical synchronizing information is situated at the beginning of a track near the edge of the magnetic tape. When the edge portion of the... |
| 4488183 |
Copy-proof recording medium and device for adding copy-proof interference signal |
| Dec-11-1984 |
A copy-proof interference signal or signals is/are added to the composite color video signal to be recorded on a recording medium in the vicinity of the horizontal synchronous signal. The interference... |
| 4488176 |
Method of and apparatus for modifying a video signal to inhibit recording thereof |
| Dec-11-1984 |
Video signal lines are added to or omitted from the ends of individual fields of a video signal to produce a modified video signal whose field length varies at a slow rate. The modified video signal can... |
| 4475129 |
Non-copiable videotape recording system |
| Oct-2-1984 |
A non-copiable videotape recording system includes a synchro signal separator adapted to separate a horizontal and a vertical synchro signal from a synchro signal section of a video signal, a first-pulse... |
| 4439785 |
Subscriber television system |
| Mar-27-1984 |
A video recorder has a first transducer which moves with respect to a moving tape to selectively record and play back video information; the tape has a control region which is accessed for recording or... |
| 4213149 |
Apparatus for preventing video tape duplication |
| Jul-15-1980 |
A video processor is disclosed wherein each vertical sync pulse of a composite video signal is shifted to an intermediate amplitude a predetermined time period after the leading edge thereof, to defeat... |
| 4185305 |
Video information recording and reproducing methods and apparatus |
| Jan-22-1980 |
Methods and apparatus for recording and subsequently reproducing video signals including video and synchronization information initially record the video signals and first control information distinct... |
| 4163253 |
Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof |
| Jul-31-1979 |
A method of and apparatus for modifying a video signal such that a video picture can be reproduced by a video display device in response to the modified video signal, but if the modified video signal is... |
| 4100575 |
Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof |
| Jul-11-1978 |
A method of and apparatus for modifying a video signal such that a video picture can be reproduced on a television receiver in response to the modified video signal, but if the modified video signal is... |
| 4030128 |
Video record scrambling and unscrambling |
| Jun-14-1977 |
There is disclosed a method of scrambling a video information recording of a type having video information and a video information playback control signal recorded on a recording medium, with the playback... |
| 3963865 |
Anti-piracy method and system |
| Jun-15-1976 |
There is disclosed herein a method and system for eliminating or deterring the unauthorized duplication or piracy of video program material, including video tape, cable and broadcast television material.... |
