Experiments

Specmurt anasylis was experimentally applied to 16kHz-sampled monaural music signals from the RWC music database[9]. The analysis conditions are shown in Table 2. The common harmonic structure $h(x)$ was determined so that the $n$-th harmonic component has an energy ratio of $1/n$ relative to the fundamental frequency component after some preliminary experiments covering $n^{-\alpha}$ ( $alpha=0.5, 1, 1.5$) and utilizing an a priori knowledge that natural sound tend to have $1/f$ spectra.

A typical result is shown in Fig. 5(b) in which fundamental frequency components are emphasized and overtones in Fig. 5(a) are significantly suppressed. As shown in Fig. 5(b), the time series of fundamental frequency components appear like piano-roll-displays that are very much like to the manually prepared references shown in Fig. 5(c).