DFP is a user friendly GUI front-end to digital filter design with MATLAB.
It extends MATLAB's functionality in filter design by quantizing filter coefficients and producing assembler code (currently, version 1.0 only supports assembler for Motorola's DSP56k family). The site contains downloadable files.
preview:
http://www.ee.ryerson.ca:8080/~mzeytin/dfp/index.html
4/20/1999