A real time AMBA based audio coprocessor for System-on-Chip

Abstract

This paper proposed a design of an audio coprocessor and interface. The design is based on AMBA bus system that is easily interfaced into System on Chip (SoC). The design had been integrated with Leon 3 SoC and implemented into Altera TM DE2-115. In order to obtain a real-time audio processing, several audio interface and co-processor modules have been designed and integrated into SoC system. by using DMA access. The designed audio interface consists of WM8731 audiocodec driver and buffer that works in 48 kHz data-rate. The audio co-processor consists of hanning window filter and 256 point FFT/IFFT. The FFT/IFFT co-processor is provided to enable the audio process in both time and frequency domain. The Hann window is used to maintain the continuity of block processing. In order to provide high speed data processing, those modules are interfaced to SoC using DMA acccess.