Development of a high quality wireless sound reinforcement system

Abstract

This paper describes the development and initial application of a wireless sound reinforcement system. This system consists of wireless communication module, digital signal processor (DSP) and audio codec. Signal processing algorithms are used to achieve high quality wireless voice communications and audio playback. To this end, howling suppression algorithm is implemented using DSP. To date, there are three widely used methods for acoustic feedback control: phase-modulating feedback control (PFC), adaptive feedback cancellation (AFC), and notch-filter-based howling suppression (NHS). In this system, we used an adaptive notch filter (ANF) to perform feedback controlling. Simulation Results indicates the effect of this algorithm in suppressing howling. Furthermore, the control strategy of the algorithm is optimized by experiments in a conference room environment. The experimental results show the performance of this system in the real environment.