A Learning Approach for Wavelet Design

Jawali, D and Kumar, A and Seelamantula, CS (2019) A Learning Approach for Wavelet Design. In: 44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019, 12 - 17 May 2019, Brighton, pp. 5018-5022.

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Abstract

Wavelet analysis and perfect reconstruction filterbanks (PRFBs) are closely related. Desired properties on the wavelet could be translated to equivalent properties on a PRFB. We propose a new learning-based approach towards designing compactly supported orthonormal wavelets with a specified number of vanishing moments. We view PRFBs as a special class of convolutional autoencoders, which places the problem of wavelet/PRFB design within a learning framework. One could then deploy several state-of-the-art deep learning tools to solve the design problem. The PRFBs are learned by minimizing a squared-error loss function using gradient-descent optimization. The model is trained using a dataset containing random samples drawn from the standard normal distribution. We demonstrate that imposing orthonormality and vanishing moment constraints in the learning framework gives rise to filters that generate an orthonormal wavelet basis. We present results for learning PRFBs with filter lengths 2 and 8. As an illustration, we show that the proposed framework is able to learn the Daubechies wavelet with four vanishing moments, as well as wavelets with an arbitrary number of vanishing moments. For all our results, the signal-to-reconstruction error ratio is greater than 200 dB, implying that perfect reconstruction is indeed achieved accurately up to machine precision. © 2019 IEEE.

Item Type:	Conference Paper
Publication:	ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Audio signal processing; Deep learning; Filter banks; Gradient methods; Multiresolution analysis; Normal distribution; Speech communication, Autoencoders; Gradient descent optimization; Learning-based approach; Perfect reconstruction; Squared error loss functions; Standard normal distributions; Vanishing moment; Wavelet design, Discrete wavelet transforms
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	19 Dec 2022 07:26
Last Modified:	19 Dec 2022 07:26
URI:	https://eprints.iisc.ac.in/id/eprint/78407

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