1. A method for continuous pattern recognition of broadcast segments, each of said segments having at least one of an audio portion and a video portion, said method comprising: constructing a digital signature from a known sample of a segment to be recongnized by digitally parametizing said segment, selecting frames from among random frame locations throughout said parametized segment in accordance with a set of predefined rules to form said signature, and associating with said signature the locations of said selected frames relative to a reference location; storing said signature and said associated frame locations in a library of signatures, each signature in said library being identified with a particular segment to be recognized; monitoring a broadcast signal; digitally parametizing said monitored signal; and for each frame of said parametized monitored signal, searching said library for signatures potentially associated therewith and, using the frame location information associated with said potentially associated stored signatures, comparing each of said potentially associated stored signatures to the appropriate frames of said parametized monitored signal.