A BPM counter is essentially a digital device that measures the rate of the music passing through and makes an intelligent guess at the speed of the music in BPM (beats per minute). Most of this is done in DSP and requires a fair amount of processing.

BPM counters are employed in a variety of digital dj equipment, the most common being on a mixer where an inbuilt processor counts the timing of the music to aid in the mixing of the two sources.

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