C28x Filter Library SPRC082 (ACTIVE)
Digital filters are a common requirement for digital signal processing systems. There are two types of digital filters: Finite impulse response (FIR) and infinite impulse response (IIR) filters. Both the filter modules are available in the filter library.
We have made available an ezFIR filter design package (MATLAB script) to interactively generate filter coefficients for the required frequency response characteristics.
IIR filter uses the cascade configuration of direct form II structured Second order section (SOS) that reduces sensitivity to coefficient quantization. The SOSs are commonly referred to as "biquads". The SOS coefficients generated by the MATLAB for given set of filter specification provides unity gain in the pass-band and attenuates the remaining frequency component. Though the input to output gain does not peak above unity, the intermediate node gain in the "biquad" sections would vary significantly depending on the filter characteristics. Hence, we have made a available a ezIIR filter design package (MATLAB script) that generates scaled second order coefficients without overflow issues in the intermediate nodes. The following table summarizes the set of modules that are available in this library.
The following table summarizes the set of modules that are available in this library.
Documentation of Filter Modules is archived in the self-extracting zip file, and the pdf files can be found in c:\tidcs\c28\dsp_tbox\filter\doc directory.
Software Test Bench (STB) support library must be downloaded to use the STB examples.