42. A method for continuous patern recognition of broadcast segments, each of said sgements having at least one of an audio portion and a video portion and further having a first portion that is the same each time the segment is broadcast and a second portion that may differ each time the segment is broadcast, said method comprising: constructing a signature from a known sample of the first portion of such a segment to be recognized; recording additional data from known samples of said second portion; storing said signature and said additional data; associating with said stored signature an indication of the existence of said second portion; monitoring a broadcast signal; identifying the first portion of a broadcast segment in said monitored broadcast signal with said signature; and using said additional data to identify the second portion of said broadcast segment.
44. The method of claim 42 wherein: each of said segments has at least a video portion and said step of recording additonal data comprises recording at least one video frame of said second portion; and said using step comprises performing a direct comparision of said at least one video frame and at least one video frame of said monitored broadcast signal.