A Real-Time Rhythmic Analyzer and Equalizer

The rhythmic analyzer and equalizer presented in this paper allows to cut or boost the signal at a given audio frequency and a given rhythmic frequency, that is, number of beats per minute (BPM). A task that can be addressed with the rhythmic equalizer is for instance to emphasize series of 1/8 triplet notes played on the hi-hat of the drum set. The software works in real time and offers an interactive graphical user interface that supports both analysis and adjustment. The current energy distribution in the two-dimensional audio frequency (Hz) / rhythmic frequency (BPM) space is displayed as a continuously updated backdrop image. The user paints the intended adjustments of BPM levels and phases onto an image layer added on top of this image.