A central database provides a location for creating and storing samples of known television commercials. The database of commercial samples is downloaded to a set-top box via a communicate link. The set-top box incorporates a processor for comparing a television signal with the database of known commercial...http://www.google.es/patents/US20040226035?utm_source=gb-gplus-sharePatente US20040226035 - Method and apparatus for detecting media content
