Audio Denoising Coprocessor Based on RISC-V Custom Instruction Set Extension

As a typical active noise control algorithm, Filtered-x Least Mean Square (FxLMS) is widely used in the field of audio denoising. In this study, an denoising coprocessor based on Retrenched Injunction System Computer-V (RISC-V), custom instruction set extension was designed and software hardware co-design adopted; traditional pure implementation, accelerator optimization design carried out, connected to RISC-V core form coprocessor. Meanwhile, corresponding instructions were designed, compiling environment established, library function acceleration established by embedded inline assembly. Finally, (ANC) system built tested Hbird E203-Core, test data collected through analyzer. The results showed that algorithm can be realized combining heterogeneous Chip (SoC) with accelerator, effect approximately 8 dB. number consumed testing for specific operations reduced 60%, operation significant.