1. A method of classifying broadcast information, comprising the steps of: receiving broadcast information; performing a spectral analysis of said information and providing a plurality of analyzed waveforms corresponding thereto; generating a spectragram from said waveforms; comparing the generated spectragram with a plurality of predetermined first stage reference spectragrams; queueing the first stage reference spectragrams in order of their similarity to said generated spectragram; correlating at least one of a plurality of predetermined second stage reference patterns which correspond to said first stage reference spectragrams with one of said analyzed waveforms in the queueing order established in the queueing step to provide a correlation value for each of the correlated second stage reference patterns; monitoring said correlating step to determine when one of said correlation values exceeds a threshold correlation value; identifying the second stage reference pattern which corresponds to the correlation value which exceeds said threshold value; and classifying the broadcast information as similar to the identified second stage reference pattern.