AN IMPROVED ANC SYSTEM WITH APPLICATION TO SPEECH COMMUNICATION IN NOISY ENVIRONMENT

 A new two stage FxNLMS algorithm based ANC system with secondary path modelling was proposed in [15].Performance analysis of this system with real signals has been carried out using computer simulation. Simulation studies showed that the system after trained with WGN can be successfully used for reducing wide sense broad band noise.This paper also explores the intelligibility of speech signals in the quiet zone created by the ANC system. The utterances of phonetically balanced Harvard sentences with different SNRs are propagated through the quiet zone and the intelligibility of the resultant speech signal is measured using MOS (Mean Opinion Score) test. Encouraging results are obtained which indicates that the two stage FxNLMS algorithm based ANC system can find application in mobile phone communication.