New answers tagged fourier
6
votes
Why is the time domain low-pass filter the "sinc" shape?
One way to think about it is the requirement of what a filter does, and what is the relation between the time domain and frequency domain plots of the signal or the filter.
This also requires to know ...
- 2,268
20
votes
Accepted
Why is the time domain low-pass filter the "sinc" shape?
It is a good way to understand the lowpass behavior of sinc function (as well as the convolution) through visualization. I've made some modification on this animated convolution project and here are ...
- 3,173
5
votes
Why is the time domain low-pass filter the "sinc" shape?
Perhaps one way to see the sinc is as a special moving average filter. As you noted, the lower the cutoff frequency (filtering out higher frequencies), the wider the sinc mainlobe. This corresponds to ...
- 1,652
0
votes
What is the reason of existence of Fourier transform? (Why we use Fourier transform?)
The Taylor series attempts to model a limited piece of a function or a data series using a weighted sum of polynomials. This only works for relatively small values of x or t.
The Fourier ...
- 21
0
votes
“The Fourier transform cannot measure two phases at the same frequency.” Why not?
If you change the phase at a constant frequency, FFT calculates a different result. Unfortunately, it is common practice to erase the phase by forming and displaying the magnitude (see line 7 in the ...
- 21
Top 50 recent answers are included