2002 · 388 citations · 10 references
EngineeringArchitectural EngineeringAcousticsComputational AcousticsStatistical ModelingArchitectural AcousticsChannel EstimationPropagation DelayRoom AcousticsDelay EstimationLinear RegressionMultipathReverberationReverberation EffectsRoom Acoustics ModelingTime Delay Estimation
Conventional time‑delay estimators suffer dramatic performance degradation in multipath environments, limiting their use in reverberant rooms, especially for speech signals where channel compensation may be infeasible. The paper proposes an alternative time‑delay estimation approach that reformulates the problem as a linear regression of phase data. The authors implement the method by performing linear regression on phase data, minimizing a robust error metric, and validating it through simulations across various source positions and room conditions against conventional estimators. The proposed technique demonstrates reduced sensitivity to room reverberation compared to conventional methods.
Conventional time-delay estimators exhibit dramatic performance degradations in the presence of multipath signals. This limits their application in reverberant enclosures, particularly when the signal of interest is speech and it may not possible to estimate and compensate for channel effects prior to time-delay estimation. This paper details an alternative approach which reformulates the problem as a linear regression of phase data and then estimates the time-delay through minimization of a robust statistical error measure. The technique is shown to be less susceptible to room reverberation effects. Simulations are performed across a range of source placements and room conditions to illustrate the utility of the proposed time-delay estimation method relative to conventional methods.
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