feat: add more Livebook guides by thomaspmurphy · Pull Request #33 · elixir-nx/nx_signal

thomaspmurphy · 2026-06-15T14:19:47Z

Summary

Adds new Livebook guides for convolution, window functions, FIR filtering, peak finding, sound synthesis, and financial signal processing
Updates the existing spectrogram and FFT/filtering guides for the current API (positional window size, firwin cutoff as list)
The financial signals guide was a natural opportunity to put firwin to immediate practical use: it designs a 63-day low-pass filter over a synthetic S&P 500 price series to reproduce the moving average familiar to traders, but with a sharper roll-off
Fixes a few bugs in the Livebooks caused by historical API changes

Sidelobe comparison of nx_signal windows:

Using firwin to smooth financial data:

Note: guides/financial_signals.livemd includes a Zoom FFT section that depends on NxSignal.zoom_fft/4 introduced in the companion Chirp Z-Transform PR. The rest of that guide runs independently against the current release.

…ding, sound synthesis, and financial signals New guides covering: convolution theorem and cross-correlation, window functions and spectral leakage, FIR filtering, peak finding with argrelmax/ argrelmin, sound synthesis with waveforms and STFT, and signal processing for economic data. Also fixes the spectrogram guide for the new positional window-size API and updates firwin calls to require a list cutoff.

thomaspmurphy · 2026-06-15T15:31:11Z

+
+```elixir
+Mix.install([
+  {:nx_signal, path: __DIR__ |> Path.join("..") |> Path.expand()},


Note: had to hardcode all of these to pick up the latest changes for this PR.

Cool. Although I'm not sure you need Path.expand. We can merge this as-is, anyway!

…nsor

thomaspmurphy changed the title ~~feat: add Livebook guides~~ feat: add more Livebook guides Jun 15, 2026

thomaspmurphy force-pushed the feat/guides branch from 9e1a19d to f07810e Compare June 15, 2026 15:27

thomaspmurphy commented Jun 15, 2026

View reviewed changes