Sound Localization and Directed Speech Enhancement in Digital Hearing Aid in Reverberation Environment

A new scheme of source localization and directed speech enhancement in digital hearing aid in reverberation environment is proposed in this article. In the field of source localization, an adaptive PSP-AED time delay estimation algorithm is proposed. With the position of the source, the scheme enhances the speech signal using broadband Linearly Constrained Minimum Variance beamformer. The interferences and the noises are eliminated when the beampattern is directed to the target source position. The proposed algorithm is robust to noise. It estimates the time delay accurately, when Signal to Noise Ratio is lower than 0 dB and then the position of the source is acquired. The improvement of Signal to Interference Ratio (SIR) is achieved upper than 7 dB in reverberation environment. Numerical Experiments prove that, the performance of wave quality, spectrogram and SIR is improved notably in the enhanced speech signal.