Integration of STFT and Wigner analysis in a knowledge-based system for sound understanding

The authors describe and demonstrate how the combined use of Wigner and short-time Fourier transform (STFT) processing can be used to advantage in a sound understanding application. Specifically, the Wigner processing of a signal is used for alerting the signal understanding system to the possibility of inadequate time or frequency resolution in the STFT processing of the same signal. The signal understanding system may then reprocess the signal with an STFT with a different window length. The knowledge-based control required for carrying out such signal processing is available in a sound understanding system in the context of which this research was carried out