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In this paper, a two-stage time domain technique is proposed to improve intelligibility of speech signals under noisy-reverberant conditions. In this method, the NNESE and ARA NSD methods are jointly taken into account to mitigate the effects of noise and reverberation separately. Additionally, the resulting approach is adaptive in the sense that no prior knowledge of speech statistics or room information is required. Two intelligibility measures (ASII ST and ESII) are used for objective evaluation. The results show that the proposed twostage scheme leads to a higher intelligibility improvement when compared to competing methods, specially for low SNR values. Furthermore, the PESQ and the updated version of the SRMR quality measure (SRMRnorm) demonstrate that the proposed technique also attains quality improvement.

This paper investigates the propagation of primary and secondary waves produced by parametric loudspeakers of different sizes. The theory of the parametric acoustic array describes the nonlinear interaction of waves to be confined to the near-field, but the nonlinearities may remain over the far-field, producing different results. Four simulations were done to compare the performance of loudspeakers with different Rayleigh distances. Based on the simulations, a new design was proposed to overcome the mismatching of absorption length and Rayleigh distance. Control over these distances is proposed as an improvement of the performance of the parametric loudspeaker, considering the required scope and proper application.

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