This application report introduces and describes an MP3 /AAC audio player for use with the TMS320C54x(TM) digital signal processor (DSP) devices. This audio player is based on Reference Framework Level 3 (RF3). Reference Framework for eXpressDSP(TM) Software is a start-ware for developing applications that use DSP/BIOS(TM) and the TMS320(TM) DSP AlgorithmStandard.-This report introduces application and de scribes an MP3 / AAC audio player for use with the TMS320C54x (TM) digital signal processor (DSP ) devices. This audio player is based on Referen ce Framework Level 3 (RF3). Reference Framewor k for eXpressDSP (TM) Software is a start-ware f or developing applications that use DSP / BIOS ( TM) and the TMS320 (TM) DSP AlgorithmStandard.