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Signal subspace has been widely exploited to localize multiple speech sources. However, most signal subspace methods cannot count the number of sources, and do not make use of speech sparsity in the frequency domain. This paper presents a grid search window-dominant signal subspace (GS-WDSS) method and a closed-form WDSS (CF-WDSS) method to localize short-term speech sources. Such methods are based...
It is a challenging issue to design a robust broad-band direction-of-arrival (DOA) estimator at the cost of low computational complexity. Many algorithms accelerate localization while maintaining robustness by optimizing the grid search. Few algorithms pay attention to the cost function of DOA estimators. This paper presents a far-filed DOA estimator based upon a novel cost function for planar arrays...
As an indispensable instrument in today's daily life, mobile phone that is used in diverse environments suffers from the speech quality degradation due to the presence of background noises. In this paper, we propose a novel two-microphone noise reduction system based on the power level ratio (PLR) of the observed signals. In the system, a primary microphone is placed close to the talker's mouth and...
Noise reduction is one of the most crucial functions, if not the most, in hearing aids, as hearing impaired people have great difficulty in understanding speech in noisy environments. In the past, we proposed a two-microphone noise reduction system with one-channel output. In this paper, we further extend this previously proposed noise reduction method for hearing aids application by applying the...
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