Body Drop Thud

How it's made

Source

a limp body (≈ 60–90 kg of water-rich soft tissue) hits a timber floor. The contact is slow and heavily damped: a 5–15 ms low-passed pressure pulse, with no hard click, because flesh spreads the force.

Body

three layers. (1) A thump: the torso and the air pocket under it, a sine falling ≈ 120 → 62 Hz in 120 ms plus low-passed brown noise. (2) The floor: large wood modes (≈ 1 : 2.57 : 4.2, 40–120 ms, mostly below 600 Hz) excited by the same soft pulse. (3) Cloth: clothing slaps and slides, band-passed pink noise at 0.5–3 kHz with a 15 ms attack and a 90–190 ms release, starting just before the main hit.

Rattle

loose boards and nails answer after the hit as 6 tiny wood ticks over 0.06–0.4 s, each a short burst of a small panel, getting weaker and sparser.

Envelope

the thump peaks within 6 ms and dies in about 0.3 s; the whole event is over at ≈ 0.7 s. A softer second impact (a limb or head settling) follows 75–145 ms later.

Variation

`rng` jitters pitch, mode tuning, rattle timing and strength, so every fall differs. Weight sets thump pitch and length, floor sets board hardness and ring, cloth and rattle set the two top layers.

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