Underwater Signal Analysis in the Modulation Spectrogram with Time-Frequency Reassignment Technique

Hyunjin CHO  Wan Jin KIM  Wooyoung HONG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E102-A   No.11   pp.1542-1544
Publication Date: 2019/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E102.A.1542
Type of Manuscript: LETTER
Category: Engineering Acoustics
modulation spectrogram,  reassignment,  underwater signal,  

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Modulation spectrogram is effective for analyzing underwater signals which consist of tonal and modulated components. This method can analyze the acoustic and modulation frequency at the same time, but has the trade-off issue of time-frequency localization. This letter introduces a reassignment method for overcoming the localization issue in conventional spectrograms, and then presents an alignment scheme for implementing modulation spectrogram. Relevant experiments show improvement in acoustic frequency estimation perspective and an increment in analyzable modulation frequency range.