Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Low Pass IIR filter using cyclone II FPGA

Hi everyone, I hava a task to implement low pass iir filter on cyclone II FPGA. The parameters of filter are the following: fp=5kHz; pass band frequency fs=8kHz; stop band frequency Fs=44k...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

The resoution of the coefficients (16 bits or less or more) depends on the wanted accuracy of the filter output, e.g. if you have a mask which the filter must fit. So I suggest you to use Matlab/Octave or any other math tool to perform a fixed-point finite-resolution simulation. You will be able to insert your coefficients with 16bits (or different) and see the result on the output. The minimum needed resolution will be the one which fits your output mask. After that you can go to the the FPGA resolution.