A C compiler based methodology for implementing audio DSP applications on a class of embedded systems

Abstract

This paper describes a methodology for a common task of audio application implementation from the referent C code to executable image targeting an audio fixed-point midscale DSPs. This methodology tries to efficiently cover the gap between the referent code and the assembler code by usage of the C compiler, which supports fixed-point types defined in C language extensions for the embedded processors. By relaying on C++ classes this methodology deliveries a possibility to debug a DSP compiler ready C code in a C++ environment (e.g. Visual C++). The methodology was successfully applied to several audio applications, such as Dolby Volume, SRS TSHD, SRS VIQ, and Audyssey Dynamic EQ, and their implementation to Cirrus Logic Coyote DSP family. Experience with those applications shows that this methodology greatly shortens time to market for DSP firmware product.