

![[Example of application field]
Knock sensing device controls and monitors the Rotation per minute (RPM) of the power train system in automobiles
The IIR Biquad filter function present in the Signal Processing Library (SPL) is used for this application
The feedback provided from Knock tool is used to control the speed Rotation per minute (RPM) of the power train system
[Conceptual image of knock sensing device for Automobile constructed]](/image/renesas/spl_04.gif)
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.)