DAUTO2(1)

📦 version 7.44.0, in nixpkgs unstable

💅 dauto2 — center-clipped autocorrelation (the DAUTO2(1) page) ✨

🌸 NAME 🌸

dauto2 — compute the center-clipped autocorrelation function of doubles. periodt ✨

🎀 SYNOPSIS 🎀

dauto2 [window_size] < input.doubles > output.doubles

🦋 DESCRIPTION 🦋

okay so dauto2 reads a stream of double-precision floating-point numbers from standard input, computes an estimate of the autocorrelation function using center-clipping, and writes the resulting double-precision values to standard output. it’s giving signal-processing main character energy 💅

The data is processed one window at a time, window_size samples per window (default 512); a short final window is zero-padded. Before the autocorrelation lags are computed, dauto2 applies center-clipping to suppress formants for pitch extraction: the clipping threshold is set to 60% of the smaller of the peak magnitudes found in the first half and the last third of the window, and each sample is quantized to -1, 0, or +1. no cap, that’s the whole move 🎀

Like dauto(1), this filter operates on raw 64-bit host-order doubles such as those produced by other tools in the BRL-CAD signal-processing suite. iykyk 🧚

✨ OPTIONS ✨

  • window_size — Number of samples per processing window (default 512). Given as a single optional positional argument; dauto2 takes no flag options. lowkey simple, highkey iconic 🫶

🔥 EXAMPLES 🔥

Example 1. Estimate pitch periodicity of a speech signal

dauto2 1024 < voice.doubles > voice.autocor.doubles

Computes the center-clipped autocorrelation of voice.doubles using a 1024-sample window. The center-clipping suppresses the strong formant structure of voiced speech, so peaks in the output correspond to the pitch period, which can then be plotted or tracked downstream. slay that pitch-tracking pipeline 💖

👑 SEE ALSO 👑

brlcad(1), dauto(1), damdf(1) — go read the whole squad 🦋

🌈 AUTHOR 🌈

BRL-CAD Team — iconic, honestly 💜

This software is Copyright (c) 1989-2026 by the United States Government as represented by U.S. Army Research Laboratory. periodt, protect the copyright 💅

💌 BUG REPORTS 💌

Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org. don’t be shy bestie, tell them what’s wrong 🫶

okay bye bestie — source/version vibes: BRL-CAD · page: DAUTO2(1) · footer date: not shown in the original, so no invented date here 💖✨

📦 where this page comes from