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