AUDIO AND VIDEO SIGNAL PROCESSING

The present disclosure related generally to audio and video signal processing. Various arrangements are disclosed. One method recites: (a) obtaining data representing audible portions of audio or representing picture portions of video; (b) using a programmed electronic processor, determining identifying information from the obtained data by computing a frequency transform to produce frequency transform data, and processing the frequency transform data to derive a pattern, and using the pattern as the identifying information for the audio or video; and (c) using the identifying data to facilitate purchase or license of the audio or video. Other arrangements are disclosed as well.