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Class Information
Number: 380/236
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Modifying accompanying audio signal
Description: Subject matter wherein a parameter of an audio signal is varied so as to render the sound unintelligible in a conventional receiver.

Sub-classes under this class:

Class Number Class Name Patents
380/237 Including digital audio 82
380/238 Including frequency modification of audio signal or frequency shifting of audio carrier 63

Patents under this class:
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Patent Number Title Of Patent Date Issued
8619996 Apparatus and method for transmitting digital multimedia broadcasting data, and method and apparatus for receiving digital multimedia broadcasting data Dec. 31, 2013
8549307 Forensic marking using a common customization function Oct. 1, 2013
8538018 Methods and apparatus for mixing encrypted data with unencrypted data Sep. 17, 2013
8433915 Selective security masking within recorded speech Apr. 30, 2013
8391484 Method and apparatus for performing video communication Mar. 5, 2013
8345870 Method and apparatus for encrypting encoded audio signal Jan. 1, 2013
8290770 Method and apparatus for sinusoidal audio coding Oct. 16, 2012
RE43554 Method of converting audio data for a portable device and reproducing the converted audio data Jul. 24, 2012
8204222 Steganographic encoding and decoding of auxiliary codes in media signals Jun. 19, 2012
RE43439 Method of converting audio data for a portable device and reproducing the converted audio data May. 29, 2012
8171561 Secure personal content server May. 1, 2012
8127361 Hierarchical scheme for secure multimedia distribution Feb. 28, 2012
8107668 Digital differential watermark and method Jan. 31, 2012
8099285 Temporally accurate watermarking system and method of operation Jan. 17, 2012
8060938 Proprietary portable audio player system for protecting digital content copyrights Nov. 15, 2011
8055505 Audio content digital watermark detection Nov. 8, 2011
8037528 Enhanced server to client session inspection Oct. 11, 2011
RE42813 Method of converting audio data for a portable device and reproducing the converted audio data Oct. 4, 2011
7996230 Selective security masking within recorded speech Aug. 9, 2011
7986795 Method and apparatus for protecting media content against unauthorized duplication Jul. 26, 2011
RE42399 Method of converting audio data for a portable device and reproducing the converted audio data May. 24, 2011
7839998 Transcoding CableCARD Nov. 23, 2010
7831832 Digital goods representation based upon matrix invariances Nov. 9, 2010
7664263 Method for combining transfer functions with predetermined key creation Feb. 16, 2010
7587756 Methods and apparatus for a secure proximity integrated circuit card transactions Sep. 8, 2009
7538764 System and method to obtain surface structures of multi-dimensional objects, and to represent those surface structures for animation, transmission and display May. 26, 2009
7475246 Secure personal content server Jan. 6, 2009
7457415 Secure information distribution system utilizing information segment scrambling Nov. 25, 2008
7424739 On-machine communication verification Sep. 9, 2008
7412547 Apparatus, system, and method for distributed processing with a peripheral input/output channel based device Aug. 12, 2008
7397920 Information processing device and method, and recording medium Jul. 8, 2008
7370204 Watermark data embedding apparatus and extracting apparatus May. 6, 2008
7319756 Audio coding Jan. 15, 2008
7230898 Reproducing apparatus and recording apparatus Jun. 12, 2007
7146008 Conditional access television sound Dec. 5, 2006
7146007 Secure conditional access port interface Dec. 5, 2006
7124444 Method of converting audio data for a portable device and reproducing the converted audio data Oct. 17, 2006
7035700 Method and apparatus for embedding data in audio signals Apr. 25, 2006
7020286 Modulation of dynamical systems for communication Mar. 28, 2006
6990198 Apparatus and method for securing communication information in CDMA communication system Jan. 24, 2006
6985590 Electronic watermarking method and apparatus for compressed audio data, and system therefor Jan. 10, 2006
6879652 Method for encoding an input signal Apr. 12, 2005
6597789 Video/audio scrambling with single conversion tuners Jul. 22, 2003
6571144 System for providing a digital watermark in an audio signal May. 27, 2003
6310957 Method and apparatus for interdicting cable television channels Oct. 30, 2001
6222924 Scrambling of digital media objects in connection with transmission and storage Apr. 24, 2001
6185687 Signal reproducing/recording/transmitting method and apparatus and signal record medium Feb. 6, 2001
6091822 Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment Jul. 18, 2000
6078668 Apparatus and method for concealing data bursts in an analog scrambler using audio repetition Jun. 20, 2000
6055315 Distributed scrambling method and system Apr. 25, 2000

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