Detection of non-stationary sinusoids by using joint frequency reassignment and null-to-null bandwidth

We present a method that efficiently describes non-stationarities by parameterizing spectral peaks in terms of the frequency reassignment operator variation and null-to-null peak bandwidth. This kind of parameterization is designed in such a way to properly deal with situations of low signal-to-noise ratios. In addition, it provides for a strong separation between the sinusoidal and noise peak class in a two-dimensional (2D) feature space. Consequently, the percentage of misclassified spectral peaks is drastically reduced, which significantly simplifies the analysis/synthesis of audio signals in the following processing stages.