This paper will discuss two methods for obtaining derived, noise-evoked otoacoustic emissions (NEOAEs). The first, originally proposed by Maat et al. , utilises the polynomial correlation functions. The application of linear compensation on the estimation of these functions
is investigated in a more formal manner than in earlier publications, by looking at its effect on the statistical estimators. The second, related but novel, approach of obtaining derived-NEOAEs is based on rescaling the H1-estimator. Then moving back and forth between the
time and frequency domains, separating the response into short and long latency temporal regions, in order to perform linear compensation. The errors on this second method are discussed, and two sources are highlighted; one due to random error on the estimates themselves; and the other due
to numerical artefacts from the use of band-limited excitation. It is observed that the highest level excitation signal, counter intuitively, produces the noisiest estimate. A method of reducing noise-induced artefacts in the output spectra for the derived-NEOAEs is proposed that takes into
account redundancy in the time series.
Document Type: Research Article
Publication date: September 1, 2005
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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.