/sci/ - Science & Math

>>11321059
>"Removing frequencies we don't want" is exactly what a filter does
Yes, but it also touches the rest.
For example, in the picture, all those waves on the left. It's supposed to be a constant 1.0 there, but all over the place.
Why can't we just be like
>if f < 500Hz: 1
>if f >= 500Hz: 0
>>11321066
>You cannot apply the convolution you described perfectly without an infinite time domain.
Could you elaborate on this part
Is it because in order to get 0.1 Hz you need at least 10 seconds of sample time, so to cover all frequencies, you need infinite time?