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Auditory Motivated Level-Crossing Approach to Instantaneous Frequency Estimation

Sekhar, Chandra S and Sreenivas, Thippur V (2005) Auditory Motivated Level-Crossing Approach to Instantaneous Frequency Estimation. In: IEEE Transactions on Signal Processing, 53 (4). pp. 1450-1462.

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Abstract

We address the problem of estimating the instantaneous frequency (IF) of a phase signal using its level-crossing (LC) information based on front-end auditory processing motivation. We show that the problem of IF estimation using LC information can be cast in the framework of estimation from irregularly sampled data. The formulation has the generality of estimating different types of IF without the need for a quasistationary assumption. We consider two types of IF-polynomial and bandlimited; we use polynomial interpolating functions for the former, and for the latter, we propose a novel "line plus sum of sines" model. The model parameters are estimated by linear regression. Considering the noisy case, LC data for different levels is analyzed, and methods for combining different estimators from LCs are discussed. Theoretical and extensive simulation results show that the performance of the zero-crossing (ZC) based IF estimator and the level-crossing based IF estimator with smaller level values is better than those obtained with higher level values or their combinations. The new technique reaches the Cramer-Rao bound (CRB) roughly above 4 dB signal-to-noise ratio (SNR), and its performance does not deteriorate rapidly with mismatch in the IF order compared with the other techniques in the literature.

Item Type: Journal Article
Additional Information: �©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: auditory processing;instantaneous frequency;irregular sampling;level-crossing;zero-crossing
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 03 Aug 2005
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ernet.in/id/eprint/3445

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