Window method
Sinc 같은 IIR 구현 못하니까
Window function is Rectangular function. Tradeoff (computing and accuracy) controlled by size. If signal has more data in high frequency, we need bigger size. If , then
output is convolution
Window functions
There are several window function. Ideal Rectangular function is not always optimal solution. More smoother functions are sometimes better.
Triangular function or rectangular function are not in practice because of derivation
- Bartlett function
Cosine based (Generally used because it is easy to derivate)
- Hanning function (Hann smoothing)
- Hamming function
- Blackman function
Frequency domain
- Main lobe (main beam) - important to includes
- Side lob