Joint spatial filter and time-varying MCLP for dereverberation and interference suppression of a dynamic/static speech source

Dereverberation of a moving speech source in the presence of other directional interferers, is a harder problem than that of stationary source and interference cancellation. We explore joint multi channel linear prediction (MCLP) and relative transfer function (RTF) formulation in a stochastic frame...

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Bibliographic Details
Published in:arXiv.org 2019-10
Main Authors: Chetupalli, Srikanth Raj, Sreenivas, Thippur V
Format: Article
Language:English
Subjects:
Adaptive filters
Adaptive systems
Computer simulation
Constraint modelling
Interference
Iterative methods
Iterative solution
Linear prediction
Maximum likelihood estimation
Selectivity
Spatial filtering
Transfer functions
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Summary:Dereverberation of a moving speech source in the presence of other directional interferers, is a harder problem than that of stationary source and interference cancellation. We explore joint multi channel linear prediction (MCLP) and relative transfer function (RTF) formulation in a stochastic framework and maximum likelihood estimation. We found that the combination of spatial filtering with distortion-less response constraint, and time-varying complex Gaussian model for the desired source signal at a reference microphone does provide better signal estimation. For a stationary source, we consider batch estimation, and obtain an iterative solution. Extending to a moving source, we formulate a linear time-varying dynamic system model for the MCLP coefficients and RTF based online adaptive spatial filter. For the case of tracking a desired source in the presence of interfering sources, the same formulation is used by specifying the RTF. Simulated experimental results show that the proposed scheme provides better spatial selectivity and dereverberation than the traditional methods, for both stationary and dynamic sources even in the presence of interfering sources.
ISSN:2331-8422