Rattling Shutters

How it's made

Source

gust pressure rocks loose wooden shutters against their frame and the house wall. Decorrelated pink-noise turbulence breathes over seconds; 3-12 ms filtered noise excites individual wooden contacts. No sustained oscillator or metallic ringing is used.

Body

slats have damped inharmonic modes near 420, 1090, 1810 and 2930 Hz, with 25-90 ms T60s. Larger shutter panels ring near 145, 340, 610 and 1030 Hz for 45-190 ms. Size scales both sets; wall contacts add a broad 110-210 Hz thump.

Envelope

a shared gust and irregular 1.7 Hz pressure wander drive airflow brightness, contact rate and force. Rattles arrive in irregular clusters at 0.5-8 per second; each cluster rebounds after 23-66 and 61-142 ms, progressively quieter. Separate heavier bangs occur roughly 0.1-1.1 times per second as the shutter swings farther.

Variation

seeded excitation, contact strength, rebound delays and tuning vary per event. Two stable positions represent separate shutters. Wind controls pressure, looseness controls contact density, size controls panel mass, and bangs controls wall strikes.

Space

outdoor close-wall perspective; a quiet low-passed 11 ms reflection supplies the wall without an indoor reverb tail. The diffuse air bed is wider than the shutters.

Presets

sheltered breeze, storm-battered shutters, heavy solid panels and thin loose louvers change density, mass, impact balance and airflow, rather than gain alone.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.