Realization problem of active noise control system is studied in the article. The foundational theory and algorithm of active noise control are introduced, the feed-forward adaptive active noise control (AANC) system is presented, the hardware solution of the system is proposed by selecting TMS320VC5509 DSP as the controller. Using the C language, the active noise realtime control system is realized, based on the FX-LMS algorithm. It's proved that 12dB cancellation on 800Hz is achieved by the experiment.
The populations of cars bring the convenience and happiness of living, but people are becoming more and more worried about the frequent loss of the cars. In this paper, a automobile security system is designed by adopting AT89C2051 and A7102C wireless transceiver. This system can use specific signal detecting means and support different alarming measure, which helps patrolmen and security guards quickly and correctly find the first crime evidence.
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