Audio replay

Write while you record, then tap anything you wrote to hear that moment. This is a simulated lecture, so no sound plays.

f(x) = Σ (an cos nx + bn sin nx)

Notes

Recording · 14 Oct, 10:031:15 of audio, paused once
  • Fourier series: any periodic f is a sum of sines and cosines
  • The coefficients come from integrating f against cos nx and sin nx
  • Gibbs phenomenon: about 9 % overshoot next to a jump
  • Problem set 4: exercises 3, 5 and 8

How it works

While you record, Gamma keeps the time you wrote each thing: every pen stroke already carries it, and each note gets a stamp.

Press play and the page keeps pace with the audio. Spotlight fades what you haven't written yet, Reveal hides it, and Static leaves the page as it is.

Tap any stroke or note to hear that moment, from 3 s before. A pause leaves no gap in the audio, so what you wrote while paused plays where the recording resumed.