Patent ID: 6574594
Filing Date: 2003-06-03
Classification: G11B,H04H,H04N

Abstract:
A method for monitoring broadcast audio content, said method comprising the steps of:receiving a broadcast datastream; generating audio identifying information for audio content from the broadcast datastream based on detected events in the audio content; and determining whether the audio identifying information generated for the broadcast audio content matches audio identifying information in an audio content database, wherein the generating step includes the sub-step of: detecting a plurality of events in the audio content, each of the events being a crossing of the value of a first running average and the value of a second running average, wherein the first running average is an average over a first averaging period of a plurality of time dependent frequency components of the audio content, and the second running average is an average over a second averaging period, which is different than the first averaging period, of the time dependent frequency components of the audio content.