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Introduction and evaluation of a new time-frequency transformation based on the CQT

  • In this paper a new time-frequency transform based on the constant-Q transform, named as adaptive quality frequency transform (AQFT), is proposed. The AQFT is a non-uniform transform with logarithmically spaced center frequencies. The CQT offers a computational disadvantage due to the large number of samples needed to assure the quality and the desired resolution at the lower frequency range. The AQFT addresses this problem precisely and limits the number of samples required by a comparable frequency division. Finally, computer simulations are provided to illustrate the performance of the proposed algorithm. According to the simulation results, the accuracy and the processing time of the AQFT and of traditional time-frequency analysis methods such as the Fast Fourier Transform (FFT), the Signal Derivate FFT (SD-FFT) and the wavelet packet transform (WPT) are contrasted.

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Author:Lilia Lajmi, Kai Blum, Marc-André Tucholke
Publisher:Ostfalia Hochschule für angewandte Wissenschaften Braunschweig/ Wolfenbüttel
Place of publication:Wolfenbüttel
Editor:Lilia Lajmi
Document Type:Article
Year of Completion:2021
Publishing Institution:Ostfalia Hochschule für angewandte Wissenschaften
Release Date:2021/06/10
Page Number:14
First Page:1
Last Page:14
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften und Maschinenbau / 621.3 Elektrotechnik, Elektronik
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International