What is the difference between FIR1 and FILTFILt in MATLAB?

1. What does Filtfilt do in Matlab?
2. What is the fir1 function in Matlab?
3. What is the difference between Filtfilt and filter?

What does Filtfilt do in Matlab?

Description. y = filtfilt( b , a , x ) performs zero-phase digital filtering by processing the input data x in both the forward and reverse directions. After filtering the data in the forward direction, the function reverses the filtered sequence and runs it back through the filter.

What is the fir1 function in Matlab?

b = fir1( n , Wn ) uses a Hamming window to design an n th-order lowpass, bandpass, or multiband FIR filter with linear phase. The filter type depends on the number of elements of Wn .

What is the difference between Filtfilt and filter?

You can see that although filter() and filtfilt() both remove the high frequency noise, the use of filter() introduces significant phase delay. filtfilt() has zero phase delay. Further, at t=0, the output of filter() starts at 0, whereas the output of filtfilt() has matched the initial conditions exactly ².