News for hackers. Stuff that matters.

A comment on Ask HN: Teach me something new. Parent comment

Re:Ask HN: Teach me something new by someweirdperson on Saturday April 30, 2022 @06:23AM (#31214826)
> The pedal is a time-invariant system when it satisfies f(x, t1) = f(x, t2). In English, a time-invariant pedal does not warble over time. > Reverb, delay, EQ, and wah are all LTI effects.

The math doesn't work, assuming scalar f, x, t1, t2 as implied by their description. For a delay the x passed at t1 has no correlation to what f calculates to. It needs vectors F(X, t) and X I think.

[ Parent | on HN ]
Re:Ask HN: Teach me something new by vermarish on Saturday April 30, 2022 @01:19PM (#31217520)
You found it! I rewrote my comment like six times because I think the rigorous notation where the signal is a function of t is a little messy for a HN comment. I tried picking a notation that was less intimidating and wasn't too obviously inconsistent.
[ Parent | on HN ]