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Class Information
Number: 380/220
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Carrier frequency conversion
Description: Subject matter under subclass 210 in which the frequency of a carrier wave is modified for encryption.

Patents under this class:

Patent Number Title Of Patent Date Issued
8688993 Method and apparatus for determining and using the sampling frequency for decoding watermark information embedded in a received signal sampled with an original sampling frequency at encoder si Apr. 1, 2014
8514915 Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting Aug. 20, 2013
8380683 Data conversion device, data conversion method, and program Feb. 19, 2013
8184681 Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting May. 22, 2012
8086221 Authorizing an endpoint node for a communication service Dec. 27, 2011
7813451 Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting Oct. 12, 2010
7720226 Private and secure optical communication system using an optical tapped delay line May. 18, 2010
7583802 Method for using a synchronous sampling design in a fixed-rate sampling mode Sep. 1, 2009
7545938 Digital watermarking which allows tampering to be detected on a block-specific basis Jun. 9, 2009
7409060 Durable and undecipherable digital watermarking technique and detection of unauthorized use Aug. 5, 2008
7086087 Information processing device, card device and information processing system Aug. 1, 2006
6597789 Video/audio scrambling with single conversion tuners Jul. 22, 2003
6519340 Method and apparatus for encryption using partial information Feb. 11, 2003
5463656 System for conducting video communications over satellite communication link with aircraft having physically compact, effectively conformal, phased array antenna Oct. 31, 1995
5450454 Coding and decoding a modulated radio frequency signal Sep. 12, 1995
5446795 Universal decoder for television signal scramble systems Aug. 29, 1995
5430798 Scrambled TV-IF signal transmission system Jul. 4, 1995
5311543 Television transmission system using two stages of spead-spectrum processing May. 10, 1994
5301245 System for transmitting a commercial program in a CATV system Apr. 5, 1994
5235640 Master decoder for television signal scramble systems Aug. 10, 1993
5056139 Methods and apparatus for electronically limiting broadcast communication Oct. 8, 1991
5052047 Modulator-remodulator with common local oscilator Sep. 24, 1991
4951313 Scrambled frequency modulated video signal transmission system Aug. 21, 1990
4864613 Broadband converter/descrambler interface for cable TV Sep. 5, 1989
4827509 CATV receiver May. 2, 1989
4823387 Television tuning system with provisions for tuning RF signals with scrambled video information Apr. 18, 1989
4771456 Cable television channel selector/descrambler for use with cable-ready video applicances Sep. 13, 1988
4589016 FM television signal receiving circuit May. 13, 1986
4575753 Method of and apparatus for scrambling and decoding television and similar signals with wobbulating trapping Mar. 11, 1986
4518993 Television signal receiving system May. 21, 1985
4509210 Television receiver adaptable for descrambler module Apr. 2, 1985
4325078 Pay per view television control device Apr. 13, 1982
4286288 Apparatus and method for tamper resistant channel attenuation in subscription television converter Aug. 25, 1981
4253114 High security subscription television system employing real time control of subscriber's program reception Feb. 24, 1981
4130833 Pay television system Dec. 19, 1978
4109281 Terminal device for CATV Aug. 22, 1978
4091413 Security system for pay-TV channel May. 23, 1978
4081831 High security subscription television system employing real time control of subscriber's program reception Mar. 28, 1978
4079419 Method and apparatus for transmitting and receiving additional information in a television signal Mar. 14, 1978
3997718 Premium interactive communication system Dec. 14, 1976

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