# Original peak and loudness listening comparison

Created by Saturalabs on October 23, 2026. These are original synthetic audio
examples, not recorded voices, musical performances, or AI separation results.

Both files contain four seconds of mono, 48 kHz, 16-bit PCM WAV: 192,000 frames,
384,044 bytes including the basic header. The source is a 440 Hz cosine with an
integer peak of 8,192 out of 32,768. Both files have 20 ms outer linear fades.

`steady.wav` keeps the tone's amplitude through the middle. `pulsed.wav` uses
half-second cycles: a 20 ms half-cosine rise from one-quarter amplitude to full
amplitude, 60 ms at full amplitude, a 20 ms half-cosine return, then 400 ms at
one-quarter amplitude. This changes the energy pattern while keeping the peak.

The exact generator is `scripts/generate-loudness-examples.ts` in the Saturalabs
project. Samples are rounded to signed integer PCM. Measurement operates on
those shipped PCM values divided by 32,768, rather than an earlier float signal.
The downloadable `measurements.json` records the resulting readings. Identical
sample peaks do not establish identical integrated loudness or identical
perceived playback on every system.

Independent FFmpeg ebur128 checks of these exact WAVs return −15.7 LUFS for
steady and −22.6 LUFS for pulsed. Saturalabs' integrated meter reports −15.74
and −22.65 LUFS respectively. Both sample peaks are −12.04 dBFS. Differences
remain within the reference test's 0.12 LU tolerance; this is not full delivery
compliance certification. These are whole-file readings, not measurements of
an arbitrary selection or of the playback device.

## Reuse

To the extent possible under law, Saturalabs dedicates these two original WAV
files and this measurement report to the public domain under CC0 1.0:
https://creativecommons.org/publicdomain/zero/1.0/

No attribution is required. This dedication covers these learning assets, not
third-party recordings, website software, or AI outputs generally.