vijayshah
asked on
filter implementation algorithm
Looking for algorithmic approach and execution steps at C (Or Texas TMS320 SERIES DSP Processor ASSEMBLY LEVEL) FOR implementation of Digital Bandpass filter having stop band attenuation of >75db with sharp stop-pass-stop band transition (0-11.7 and 16.3 to 24Khz+ is stop band freq. and 12.35 to 15.7 Khz as pass band freq.)Note: One of the IEEE paper talks about 22nd order filter for similar requirements using bilinear z transformaton.
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but MATLAB uses some stuff called as mfiles or something
The m-files are written in MATLAB's own language. The language is interpreted (so the source is included), and is fairly easy to convert to C, either by hand or using the Real-Time Workshop toolbox available as an extension to MATLAB.
For the above application, however, is it necessary to re-calculate the filter coefficients on the fly, or just run the filter? The implementation of the filter itself is very simple - a matrix of second-order sections optimised for numerical robustness (this can be done automatically by MATLAB).
For the above application, however, is it necessary to re-calculate the filter coefficients on the fly, or just run the filter? The implementation of the filter itself is very simple - a matrix of second-order sections optimised for numerical robustness (this can be done automatically by MATLAB).
A quick calculation using MATLAB has given me the coefficients for a 16th order elliptic filter with 0.1dB passband ripple (just over 1%) which meets your criteria.