Introduction - If you have any usage issues, please Google them yourself
MATLAB-based FIR digital filter design of the digital filter to enhance common understanding of targets and the design process. FIR filters achieve the commonly used window function method and design method such as ripple. Window function method also includes two branches, one is to use the formula to manually calculate the first N values and other parameters of the corresponding window function value was then substituted into the window functions and fir1 achieved, one is to use a function* rord estimate the parameters of N and the corresponding re- achieved with fir1. But pay attention to* rord will underestimate or overestimate the order sub-n, may make up less than a specified filter performance, this time to be a slight increase or decrease order times. If the cut-off frequency of 0 or near the Nyquist frequency, or the value of a larger dev set, then the result is not correct