Abstract:
This paper presents an algorithm for time
scale modification (TSM) of music signal based on
Harmonic-Percussive Separation. The main
problem in time scale modification of music signal
is because of transients at note onsets in original
music signal. These transients cause the time
scaled result into stuttering distortion or loss of
presence of original music. Many algorithms were
developed to reduce transient problems of music
and to commercially use the Time Scale
Modification upon audio. In this paper, we solve
transients problems of time scale modification by
first separating the music signal into harmonic
component which contains the sound components
that slow variation in amplitude over time and
percussive component which contains transients of
input music. Median filter is used for Harmonic-
Percussive Separation. The harmonic component
is modified with frequency domain phase locked
vocoder approach and the percussive component
is processed with time domain overlap add
approach. Finally, the modified harmonic
component and the modified percussive
component are superposed to get the time scaled
music.
