Enhanced 32-bit Microprocessor-based SoC for Energy Efficient MP3 Decoding in Portable Devices

This paper presents a 32-bit microprocessor-based SoC optimized for low power MP3 decoding in portable devices. The SoC consists of a 32-bit ARM-like microprocessor core with an instruction set extension and two optional hardware accelerators for IMDCT and poly-phase synthesis modules. Depending on the configuration, the enhancements allow the SoC to run at lower frequency (78%~86%) and reduce energy consumption by 25.4%~38.5% in decoding MP3 streams.