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Class Information
Number: 380/238
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Modifying accompanying audio signal > Including frequency modification of audio signal or frequency shifting of audio carrier
Description: Subject matter wherein audio modification occurs by varying a frequency characteristic of an audio signal or by frequency shifting of an audio carrier.

Patents under this class:
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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
8424083 Controlling activation of an application program in an audio signal processing system Apr. 16, 2013
8306811 Embedding data in audio and detecting embedded data in audio Nov. 6, 2012
8300813 Secure information transfer based on global position Oct. 30, 2012
8184809 Adaptive and progressive audio stream scrambling May. 22, 2012
8171561 Secure personal content server May. 1, 2012
8130963 Method and apparatus for secure key delivery for decrypting bulk digital content files at an unsecure site Mar. 6, 2012
8127361 Hierarchical scheme for secure multimedia distribution Feb. 28, 2012
8081757 Blind watermarking of audio signals by using phase modifications Dec. 20, 2011
7996230 Selective security masking within recorded speech Aug. 9, 2011
7933411 Method of constructing MPEG program streams from encrypted MPEG transport streams Apr. 26, 2011
7844072 Watermark embedding and detection of a motion image signal Nov. 30, 2010
7802101 System and method of retrieving a watermark within a signal Sep. 21, 2010
7664274 Enhanced acoustic transmission system and method Feb. 16, 2010
7660982 Subscription broadcast security system Feb. 9, 2010
7580522 Digital video broadcasting receiver Aug. 25, 2009
7558389 Method and system of generating a speech signal with overlayed random frequency signal Jul. 7, 2009
7543148 Audio watermarking with covert channel and permutations Jun. 2, 2009
7529941 System and method of retrieving a watermark within a signal May. 5, 2009
7475246 Secure personal content server Jan. 6, 2009
7451319 System and method of watermarking a signal Nov. 11, 2008
7376843 Remote control of VCR with electronic mail May. 20, 2008
7257710 Additional-data embedding apparatus and additional-data embedding method Aug. 14, 2007
7159118 Methods and apparatus for embedding and recovering watermarking information based on host-matching codes Jan. 2, 2007
7146503 System and method of watermarking signal Dec. 5, 2006
7043019 Copy protection for digital motion picture image data May. 9, 2006
7020286 Modulation of dynamical systems for communication Mar. 28, 2006
7020285 Stealthy audio watermarking Mar. 28, 2006
6937728 Verifiable anonymous channel Aug. 30, 2005
6697942 Method for remotely managing a remote device using an electronic mail message Feb. 24, 2004
6690812 Watermark insertion and extraction into and from a high quality signal is performed using sample rate conversion Feb. 10, 2004
6683958 Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation Jan. 27, 2004
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
6427012 Apparatus and method for embedding and extracting information in analog signals using replica modulation Jul. 30, 2002
6424925 Circuit and method for detecting a tone signal Jul. 23, 2002
6425082 Watermark applied to one-dimensional data Jul. 23, 2002
6061793 Method and apparatus for embedding data, including watermarks, in human perceptible sounds May. 9, 2000
5598471 Method and apparatus for encoding and decoding of audio transmission signals Jan. 28, 1997
5528692 Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset Jun. 18, 1996
5471531 Method and apparatus for low cost audio scrambling and descrambling Nov. 28, 1995
5430798 Scrambled TV-IF signal transmission system Jul. 4, 1995
5206908 Method and apparatus for detecting timing pulses for scrambled television system Apr. 27, 1993
5159631 Audio scrambling system using in-band carrier Oct. 27, 1992
5144666 Decoder to decode an encrypted sound Sep. 1, 1992
5058159 Method and system for scrambling and descrambling audio information signals Oct. 15, 1991
4956862 Method of providing sound privacy system compatible with mono and btsc stereo audio Sep. 11, 1990
4922532 Sync suppression scrambling and descrambling of television signals for subscription TV May. 1, 1990
4910771 Television signal converter Mar. 20, 1990
4908860 System for the secret transmission of audio signals and television receiver for receiving such signals Mar. 13, 1990

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