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Class Information
Number: 380/218
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Variable time delay modulation of baseband video signal
Description: Subject matter which modifies a picture signal before carrier modulation by application of varying amounts of time delay.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7602940 |
Steganographic data hiding using a device clock |
Oct. 13, 2009 |
| 7555125 |
Systems and methods for generation of time-dependent control signals for video signals |
Jun. 30, 2009 |
| 7529941 |
System and method of retrieving a watermark within a signal |
May. 5, 2009 |
| 7321660 |
Method and apparatus for encrypting/decrypting data using timed-release keys |
Jan. 22, 2008 |
| 7305088 |
Video distribution playback method, apparatus to be disposed on video distribution end, apparatus to be disposed on video playback end, computer readable medium, and movie distribution method |
Dec. 4, 2007 |
| 7218738 |
Encryption and content control in a digital broadcast system |
May. 15, 2007 |
| 7212636 |
Encryption of a compressed video stream |
May. 1, 2007 |
| 7043019 |
Copy protection for digital motion picture image data |
May. 9, 2006 |
| 6882839 |
One-way roaming from ANS-41 to GSM systems |
Apr. 19, 2005 |
| 6711261 |
Enhancing concealment in the presence of fine mistuning for various TV scrambling techniques |
Mar. 23, 2004 |
| 6584310 |
Method and apparatus for performing authentication in communication systems |
Jun. 24, 2003 |
| 6243465 |
Method of providing video programming nearly on demand |
Jun. 5, 2001 |
| 6198822 |
Enhanced scrambling of slowly changing video signals |
Mar. 6, 2001 |
| 6009172 |
Method and apparatus for optimizing scrambling concealment of a video signal by modifying a specialized sync pulse |
Dec. 28, 1999 |
| 5844988 |
Method and apparatus for scrambling and descrambling of video signal with edge fill |
Dec. 1, 1998 |
| 5841863 |
Method and apparatus for scrambling and descrambling of video signals with edge fill |
Nov. 24, 1998 |
| 5671278 |
Video scrambling with variable function generator |
Sep. 23, 1997 |
| 5617475 |
Scrambling and descrambling of video signals using horizontal line combinations |
Apr. 1, 1997 |
| 5608799 |
Method and apparatus for scrambling and descrambling of video signal with edge fill |
Mar. 4, 1997 |
| 5579390 |
Method and apparatus for vertically scrambling and descrambling of video signals |
Nov. 26, 1996 |
| 5553141 |
Encryption and decryption (scrambling and unscrambling) of video signals |
Sep. 3, 1996 |
| 5504815 |
Method and apparatus for scrambling and descrambling |
Apr. 2, 1996 |
| RE35078 |
Method and apparatus for encrypting and decrypting time domain signals |
Oct. 31, 1995 |
| 5438620 |
Method and apparatus for scrambling and descrambling of video signal with edge fill |
Aug. 1, 1995 |
| 5410601 |
Video scramble system and equipment |
Apr. 25, 1995 |
| 5212723 |
Burst phase correction system for video descrambling |
May. 18, 1993 |
| 5161188 |
Scrambling video by horizontal and vertical time shifting |
Nov. 3, 1992 |
| 5146496 |
Method and apparatus for enhancing the security of a scrambled television signal |
Sep. 8, 1992 |
| 5058157 |
Method and apparatus for encrypting and decrypting time domain signals |
Oct. 15, 1991 |
| 5003592 |
Scrambling video by time shifting |
Mar. 26, 1991 |
| 4916736 |
Method and apparatus for encrypting and decrypting time domain signals |
Apr. 10, 1990 |
| 4901349 |
Time dispersal encryption of TV signals |
Feb. 13, 1990 |
| 4642688 |
Method and apparatus for creating encrypted and decrypted television signals |
Feb. 10, 1987 |
| 4594609 |
Scrambling system for television video signal |
Jun. 10, 1986 |
| 4466017 |
Sync suppression scrambling of television signals for subscription TV |
Aug. 14, 1984 |
| 4458268 |
Sync displacement scrambling |
Jul. 3, 1984 |
| 4392021 |
Secure facsimile transmission system using time-delay modulation |
Jul. 5, 1983 |
| 4378570 |
Receiver for jam-resistant TV system |
Mar. 29, 1983 |
| 4333107 |
Jam-resistant TV system |
Jun. 1, 1982 |
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