Metal Ladder Rung Footstep

How it's made

Source

a shoe lands across one narrow tubular rung; 2-7 ms filtered noise excites bending modes. A 22 ms rubber compression and a weaker settling contact 32-52 ms later carry the foot's weight.

Body

a hollow rung has paired bending modes near 690/708 Hz and upper modes at 1.91, 3.73, 5.79 kHz. T60 is 0.26-0.46 s at the fundamental, falling to 0.065 s in the upper shell.

Loading

the sole grips and damps the rung after 65 ms; the high shell modes disappear first. A low 145 Hz structural knock couples the rung to the ladder rails without a sub-bass stomp.

Events

four irregular, declining joint collisions at 24-180 ms excite short 255/574/1428 Hz rail modes. These are discrete settling rattles, not continuous noise or room reverberation.

Envelope

sub-ms smooth excitation onset, brief double contact, then a darkening pitched ring; the final 450-530 ms safety fade leaves silence before the 0.60 s render limit.

Variation

seeded modal tuning, contact gap and collision timing vary subtly between steps. Presets cover a firm steel rung, bright light ladder, rubber-damped tread and loose hand rail.

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