SELECTION OF TONAL COMPONENTS IN AN AUDIO SPECTRUM FOR HARMONIC AND KEY ANALYSIS

摘要

An audio signal is processed to extract key information by selecting (102) tonal components from the audio signal. A mask is then applied (104) to the selected tonal components to discard at least one tonal component. Note values of the remaining tonal components are determined (106) and mapped (108) to a single octave to obtain chroma values. The chroma values are accumulated (110) into a chromagram and evaluated (112).