Adaptive microphone array for unknown desired speaker’s transfer function
Istvan I. Papp, Zoran M. Saric, Slobodan T. Jovičić, Nikola Dj. Teslic · The Journal of the Acoustical Society of America · 2007
The main drawback of minimum variance distortionless response (MVDR) beamformer is the cancellation of the desired speech signal and its degradation in multi-path wave propagation environment. To make the adaptive algorithm robust against room reverberation and to prevent desired signal cancellation an estimation of unknown desired speaker's transfer function was proposed. The estimation is based on the signal and the interference covariance matrices. The estimated transfer function is then applied to the MVDR beamformer. The proposed algorithm was tested on a simulated room with reverberation. The results showed better quality of the restored speech compared to some typical adaptive algorithms.