Please design lowpass FIR and IIR digital filters to meet the specifications on Homework 8, which in terms of a normalized sampling rate of 1 Hz are:
Sampling rate: 1 Hz (you choose a suitable value for implementation)Choose a design method that produces digital filters with "minimum complexity". In other words, try to design filters that require the least amount of computation per sample in the real-time implementation.
Passband: 0 to 0.2 Hz
Stopband: 0.25 to 0.5 Hz
Passband ripple: less than 1 dB
Stopband attenuation: at least 40 dB
In order to transfer the digital filter coefficients from Matlab to your C program, the following Matlab commands are useful. Suppose a and b are Matlab variables containing the coefficients. These variables can be saved in text files a.txt and b.txt as follows:
save a.txt a -ascii -doubleThen you can insert the filter coefficients from these files into your C program.
save b.txt b -ascii -double
Lab Report: You do not have to submit a written lab report. Instead, please demonstrate the following during lab:
Please begin working on your final projects. Stop in to talk with me next week about your projects if you have questions, and I will discuss your progress during lab on Friday, April 18.