The signal processing library contains various primitive DSP functions such as FIR, IIR and FFT. There are different libraries offered on a variety of Renesas CPU families, tool chain and OS configurations. These functions are fine-tuned and optimized for various architectures.
This product provides the basic signal processing library (SPL) functions necessary for building signal processing applications using High-performance Embedded Workshop (HEW) that uses "C/C++ Compiler Package for SuperH Family" (SHC compiler) or any other appropriate environments (Eg: QNX, Wince etc). (See the conceptual image shown below.)