Robust estimation of synchronized spontaneous otoacoustic emission via singular value decomposition and optimal shrinkage

• Published in: JASA express letters Vol. 3; no. 11
• Main Authors: Lin, Hao-Ping, Liu, Yi-Wen
• Format: Journal Article
• Language: English
• Published: 01.11.2023
• ISSN: 2691-1191; 2691-1191
• DOI: 10.1121/10.0022336

We investigate matrix signal processing techniques for estimating synchronized spontaneous otoacoustic emission (OAE) in noise. Responses to repeated clicks are first stored in a matrix, and singular value decomposition is either applied in the time domain or the frequency domain after constructing a Hankel matrix at every frequency. The singular values are subject to optimal shrinkage (OS) which maximizes the signal-to-noise ratio. Human OAE data were analyzed, and the Hankel matrix method outperforms the time-domain OS method in synchronized spontaneous otoacoustic emission estimation, but not in the estimation of transient-evoked otoacoustic emission. Reasons for the performance discrepancy are discussed.