Mill, R.W. and Brown, G.J. (2016) Utilising temporal signal features in adverse noise conditions: Detection, estimation, and the reassigned spectrogram. Journal of the Acoustical Society of America, 139. pp. 904-917. ISSN 1520-8524
Abstract
Visual displays in passive sonar based on the Fourier spectrogram are underpinned by detection models that rely on signal and noise power statistics. Time-frequency representations specialised for sparse signals achieve a sharper signal representation, either by reassigning signal energy based on temporal structure or by conveying temporal structure directly. However, temporal representations involve nonlinear transformations that make it difficult to reason about how they respond to additive noise. This article analyses the effect of noise on temporal fine structure measurements such as zero crossings and instantaneous frequency. Detectors that rely on zero crossing intervals, intervals and peak amplitudes, and instantaneous frequency measurements are developed, and evaluated for the detection of a sinusoid in Gaussian noise, using the power detector as a baseline. Detectors that rely on fine structure outperform the power detector under certain circumstances; and detectors that rely on both fine structure and power measurements are superior. Reassigned spectrograms assume that the statistics used to reassign energy are reliable, but the derivation of the fine structure detectors indicates the opposite. The article closes by proposing and demonstrating the concept of a doubly reassigned spectrogram, wherein temporal measurements are reassigned according to a statistical model of the noise background.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Acoustical Society of America. This is an author produced version of a paper subsequently published in Journal of the Acoustical Society of America. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Computer Science (Sheffield) |
Funding Information: | Funder Grant number QINETIQ SSDW1/1739, CU016-39979 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Mar 2016 10:44 |
Last Modified: | 26 Oct 2016 04:18 |
Published Version: | https://dx.doi.org/10.1121/1.4941566 |
Status: | Published |
Publisher: | Acoustical Society of America |
Refereed: | Yes |
Identification Number: | 10.1121/1.4941566 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95754 |