Systems and methods are provided for gathering audience measurement data relating to receipt of and/or exposure to audio data by an audience member. A signature characterizing the audio data and additional data are obtained, and the audio data is identified based on both. ...http://www.google.fr/patents/US20040122679?utm_source=gb-gplus-shareBrevet US20040122679 - AD detection using ID code and extracted signature
AD detection using ID code and extracted signature
Numéro de demande: 10/328,201 Numéro de publication: US 2004/0122679 A1 Date de dépôt: 23 déc. 2002 Brevet délivré: US7483835 ( Date de délivrance 27 janv. 2009)
