Original scientific paper

Vinko Dvořák Sliding Tones: Do They Exist?

Mladen Maletić ; Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia
Branko Hanžek ; Institute for History and Philosophy of Science, Croatian Academy of Sciences and Arts, Croatia
Mladen Rogina ; Department of Mathematics, University of Zagreb, Croatia

Abstract

We are analysing variations (sliding tones) and combination tones in bird (thrush) song, following the early work of Vinko Dvořák. He was a research pioneer in determination of the critical bands of hearing, experimenting with the pitch of combination tones with frequency difference between the highest and lowest tones. Instantaneous frequency monitoring was realized after a spectrogram done with SFSWin, and the signal from the bird song record was then transformed with the Hilbert transform. An analytical signal comes from combining this transform with the original signal. There is no amplitude modulation. Analysis of the records of the bird song does not show any unexpected tone at normal loudness, contrary to early experiments where very high intensities were used, causing post experimental TTS and tinnitus.

Keywords

sliding tones; variation tones; combination tones; thrush; pipe; resonator; spectrogram; instantaneous amplitude; instantaneous phase; instantaneous frequency; Hilbert transform; critical band

Hrčak ID:

32573

URI

https://hrcak.srce.hr/32573

Publication date:

15.12.2006.

Article data in other languages: croatian

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