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

Using concentrated spectrogram for analysis of audio acoustic signals

pp. 27-32, vol. 15, 2012

Krzysztof Czarnecki
Gdansk University of Technology, Department of Geoinformatics Systems, Gdansk, Poland

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

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

Abstract: The paper presents results of time-frequency analysis of audio acoustic signals using the method of Concentrated Spectrograph also known as Cross-spectral method or Reassignment method. Presented algorithm involves signal's local group delay and channelized instantaneous frequency to relevantly redistribute all Short-time Fourier transform lines in time-frequency plain. The main intention of the paper is to compare various guitar playing techniques including legato, staccato, vibrato, glissando, slide and bending. Additionally, the advantages of concentrated spectrograms especially high energy concentration in comparison with classical spectrogram based directly only on Short-time Fourier transform are presented. Moreover, the vibrato playing technique is considered also for another musical instruments: flute and violin.

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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)