Patent ID: 8457572

Claim:
An audio comparison method, comprising: receiving an audio signal from a first radio channel as a first audio stream and outputting that audio signal; receiving an audio signal from a second radio channel as a second audio stream; measuring a volume of the first audio stream; identifying peaks in the measured volume of the first audio stream and storing times of those peaks as first stream peak times as the peaks are identified; measuring a volume of the second audio stream; identifying peaks in the measured volume of the second audio stream and storing times of those peaks as second stream peak times as the peaks are identified; when at least one of a new first stream peak time and a new second stream peak time is stored, comparing the stored first stream peak times and second stream peak times to identify matches between the first stream peak times and the second stream peak times for a constant delay between the first audio stream and second audio stream, the constant delay being any delay less than a predetermined maximum delay; and outputting a correlation factor based on a best match between the first stream peak times and the second stream peak times; identifying the second radio channel as a corresponding channel if the correlation factor is at least equal to a predetermined correlation value; and outputting the second audio stream in place of the first audio stream if the second radio channel is a corresponding channel and the second radio channel has a stronger signal.