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This paper presents a real-time active noise controller system, based around a TMS320C50 DSP system board. The proposed technique consists of identifying the noisy space medium where the cancellation needs to be effected using a coded interrogation technique, and subsequently cancelling the noise using a simple, yet robust prediction strategy. Software coding and implementation has been achieved, with a signal-to-noise ratio improvement of up to 16 dB. The time taken to achieve this performance is about 32 s, for a wideband noise over the range 50 to 200 Hz. Once the system has learned the noise characteristics of the medium, it offers good tracking characteristics in cancelling the noise thereafter.
Africon Conference in Africa, 2002. IEEE AFRICON. 6th (Volume:1 )
Date of Conference: 2-4 Oct. 2002