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De-Noising of a Room Impulse Response by Applying Wavelets

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One of the techniques most commonly used for de-noising of audio signals, images or speech is wavelet denoising. However, with regard to de-noising of room impulse responses (RIRs), the usage of wavelets can be hardly found in literature. This paper explores the potentials of applying wavelets for the reduction of negative effects of noise in these responses, since noise represents a serious problem in RIRs. The analysis is based on implementing various wavelets on both synthesized and measured RIRs containing different noises. The influence of changing the parameters of wavelets is observed in order to find an optimal set of parameters that will provide the best de-noising results. The dynamic range improvement of the backward integrated RIR as well as the noise floor reduction are used as control measures to assess the wavelet de-noising quality. The results show that the noise floor can be reduced and dynamic range can be improved significantly (e.g., by more than 10 dB) by applying the optimal set of wavelet parameters. The wavelet de-noising is compared with some other noise compensation methods using the estimated reverberation time as a control measure. In addition to de-noising, wavelets seem to be promising for detection of the truncation time of a RIR.
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Document Type: Research Article

Publication date: May 1, 2018

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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