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

• Autorzy: Czarnecki K. , Moszyński M. , Chybicki A.
• Języki publikacji: EN

Abstrakty

EN

The concept of spectrogram performance evaluation which exploits information on phase of short-term Fourier transform (STFT) is presented. A spectrograph which is a timefrequency 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.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2011
• Tom: Vol. 14
• Strony: 23--28
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Czarnecki K.

autor

Moszyński M.

autor

Chybicki A.

• Gdansk University of Technology, Department of Geoinformatics 11/12, G. Narutowicza St., 80-952 Gdansk, Poland,

Bibliografia

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• [2] Czarnecki K., Moszyński M., Rojewski M., An Objective Focussing Measure for Acoustically Obtained Images, Proceedings of 31st International Acoustical Imaging Symposium, Warsaw, April 2011.
• [3] Kodera K., Gendrin R., Villedary C., Analysis of Time-Varying Signals with Small BT Values, IEEE Transactions on Acoustics, Speech and Signal Processing, Vol. ASSP-26, No 1, February 1978.
• [4] Rihaczek A., Signal Energy Distribution in Time and Frequency, IEEE Transaction on Information Theory, Vol. IT-14, No 3, May 1968.
• [5] Auger F., Flandrin P., Improving the Readability of Time-frequency and Time- scale Representations by the Reassignment Method, IEEE Transaction on Signal Processing, Vol. SP-43, No 5, 1995.
• [6] Nelson D., Cross-spectral Methods for Processing Speech. J. Acoust. Soc. Am., Vol. 110, November 2001.
• [7] Fulop S., Fitz K., Separation of Components from Impulses in Reassigned Spectrograms, J. Acoust. Soc. Am., Vol. 121, March 2007.
• [8] Friedman D., Instantaneous-frequency Distribution vs. Time: An Interpretation of the Phase Structure of Speech, IEEE Transactions on Acoustics, Speech and Signal Processing, 1985.
• [9] Rojewski M., Unpublished notes, 2010.