Active noise control for creating a quiet zone around mobile phone

The performance of the Two Stage FxNLMS algorithm based Active Noise Control (ANC) system is evaluated in the environment of market noise. ANC is normally used for noise cancellation. While cancelling noise, ANC system cancels the noise lies in its entire frequency spectrum. However, an ANC system designed to cancel low frequency (≤500 Hz) noise, can be used in mobile phones which enables noise free communication in a noisy places such as market places, transport vehicles etc. The viability of such system in a mobile phone is examined in this paper by testing speech intelligibility in the quiet zone created by the ANC system using MOS (Mean Observation Score) method. The obtained result is satisfactory which revealed that an ANC system embedded in a mobile phone can show superior performance in a noisy environment.