ApplicationNo. 06/859134 filed on 05/02/1986
US Classes:725/22, COMMERCIAL OR PROGRAM AIRING VERIFICATION SYSTEM382/190, Feature extraction725/19By use of pattern recognition or signature
ExaminersPrimary: George, Keith E.
Attorney, Agent or Firm
International ClassH04H 9/00 (20060101)
AbstractA method, apparatus and system are provided for recognizing broadcast segments, such as commercials, in real time by continuous pattern recognition without resorting to cues or codes in the broadcast signal. Each broadcast frame is parametized to yield a digital word and a signature is constructed for segments to be recognized by selecting, in accordance with a set of predefined rules, a number of words from among random locations throughout the segment and storing them along with offset information indicating their relative locations. As a broadcast signal is monitored, it is parametized in the same way and the library of signatures is compared against each digital word and words offset therefrom by the stored offset amounts. A data reduction technique minimizes the number of comparisons required while still maintaining a large database.