|
| US4646145 | 7 avr. 1980 | 24 févr. 1987 | R. D. Percy & Company | Television viewer reaction determining systems |
| US4718106 | 12 mai 1986 | 5 janv. 1988 | | Survey of radio audience |
| US5436653 | 30 avr. 1992 | 25 juil. 1995 | The Arbitron Company | Method and system for recognition of broadcast segments |
| US5450490 | 31 mars 1994 | 12 sept. 1995 | The Arbitron Company | Apparatus and methods for including codes in audio signals and decoding |
| US5471527 | 2 déc. 1993 | 28 nov. 1995 | DSC Communications Corporation | Voice enhancement system and method |
| US5504518 | 7 juin 1995 | 2 avr. 1996 | The Arbitron Company | Method and system for recognition of broadcast segments |
| US5572246 | 7 juin 1995 | 5 nov. 1996 | The Arbitron Company | Method and apparatus for producing a signature characterizing an interval of a video signal while compensating for picture edge shift |
| US5574962 | 20 déc. 1994 | 12 nov. 1996 | The Arbitron Company | Method and apparatus for automatically identifying a program including a sound signal |
| US5579124 | 28 févr. 1995 | 26 nov. 1996 | The Arbitron Company | Method and apparatus for encoding/decoding broadcast or recorded segments and monitoring audience exposure thereto |
| US5581800 | 7 juin 1995 | 3 déc. 1996 | The Arbitron Company | Method and apparatus for automatically identifying a program including a sound signal |
| US5612729 | 7 juin 1995 | 18 mars 1997 | The Arbitron Company | Method and system for producing a signature characterizing an audio broadcast signal |
| US5621454 | 7 juin 1995 | 15 avr. 1997 | The Arbitron Company | Method and system for recognition of broadcast segments |
| US5764763 | 24 mars 1995 | 9 juin 1998 | | Apparatus and methods for including codes in audio signals and decoding |
| US5787334 | 27 sept. 1996 | 28 juil. 1998 | Ceridian Corporation | Method and apparatus for automatically identifying a program including a sound signal |
| US6871180 | 25 mai 1999 | 22 mars 2005 | Arbitron Inc. | Decoding of information in audio signals |
| US6879652 | 14 juil. 2000 | 12 avr. 2005 | Nielsen Media Research, Inc. | Method for encoding an input signal |
| US6968564 | 6 avr. 2000 | 22 nov. 2005 | Nielsen Media Research, Inc. | Multi-band spectral audio encoding |
| US6996237 | 12 juil. 2002 | 7 févr. 2006 | Arbitron Inc. | Apparatus and methods for including codes in audio signals |
| US7006555 | 27 oct. 1999 | 28 févr. 2006 | Nielsen Media Research, Inc. | Spectral audio encoding |
| US7181022 | 25 mars 2003 | 20 févr. 2007 | Digimarc Corporation | Audio watermarking to convey auxiliary information, and media embodying same |
| US7248717 | 27 juil. 2005 | 24 juil. 2007 | Digimarc Corporation | Securing media content with steganographic encoding |
| US7359528 | 7 févr. 2007 | 15 avr. 2008 | Digimarc Corporation | Monitoring of video or audio based on in-band and out-of-band data |
| US7415129 | 10 juil. 2007 | 19 août 2008 | Digimarc Corporation | Providing reports associated with video and audio content |
| US7451092 | 5 mars 2004 | 11 nov. 2008 | Nielsen Media Research, Inc. a Delaware corporation | Detection of signal modifications in audio streams with embedded code |
| US7466742 | 21 avr. 2000 | 16 déc. 2008 | Nielsen Media Research, Inc. | Detection of entropy in connection with audio signals |
| US7499566 | 22 juil. 2005 | 3 mars 2009 | Digimarc Corporation | Methods for steganographic encoding media |
| US7643649 | 13 déc. 2005 | 5 janv. 2010 | Digimarc Corporation | Integrating digital watermarks in multimedia content |
| US7672843 | 2 juin 2005 | 2 mars 2010 | The Nielsen Company (US), LLC | Audio signature extraction and correlation |
| US7702511 | 2 févr. 2007 | 20 avr. 2010 | Digimarc Corporation | Watermarking to convey auxiliary information, and media embodying same |
| US7756290 | 6 mai 2008 | 13 juil. 2010 | Digimarc Corporation | Detecting embedded signals in media content using coincidence metrics |
| US7961881 | 4 nov. 2005 | 14 juin 2011 | Arbitron Inc. | Apparatus and methods for including codes in audio signals |
| US8023692 | 15 avr. 2008 | 20 sept. 2011 | Digimarc Corporation | Apparatus and methods to process video or audio |
| US8027510 | 13 juil. 2010 | 27 sept. 2011 | Digimarc Corporation | Encoding and decoding media signals |
| US8107674 | 5 janv. 2010 | 31 janv. 2012 | Digimarc Corporation | Synchronizing rendering of multimedia content |
| US8204222 | 13 sept. 2005 | 19 juin 2012 | Digimarc Corporation | Steganographic encoding and decoding of auxiliary codes in media signals |
| US8244527 | 4 janv. 2010 | 14 août 2012 | The Nielsen Company (US), LLC | Audio signature extraction and correlation |
| USRE42627 | 22 mars 2007 | 16 août 2011 | Arbitron, Inc. | Encoding and decoding of information in audio signals |
