HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

Using phase of short-term Fourier transform for evaluation of spectrogram performance

pp. 23-28, vol. 14, 2011

Krzysztof Czarnecki
Gdansk University of Technology, Department of Geoinformatics, Gdansk, Poland
Medical University of Gdansk, Department of Informatics and Statistics, Gdansk, Poland

Marek MoszyƄski
Gdansk University of Technology, Department of Geoinformatics, Gdansk, Poland

Andrzej Chybicki
Gdansk University of Technology, Department of Geoinformatics, Gdansk, Poland

Key words: reassignment vectors; STFT; short-time Fourier transform; time-frequency analysis

Abstract: The concept of spectrogram performance evaluation which exploits information on phase of short-term Fourier transform (STFT) is presented. A spectrograph which is a time-frequency analyzing tool, is compared to a filter bank that demultiplexes a signal. Local group delay (LGD) and channelized instantaneous frequency (CIF) is obtained for each filtered component signal. In presented solution the performance is evaluated using so-called length of weighted average of reassignment vectors (WARV length). Orthogonal components of each reassignment vector are calculated using above mentioned parameters.

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© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)