Car Interior Drive

How it's made

Source

highway travel heard inside a closed car. Tyre contact excites continuous 75-2000 Hz noise; suspension and cabin absorption suppress the sharp high-frequency texture of the road outside.

Engine

a four-cylinder firing order at 68-116 Hz, a weaker half-order and two declining harmonics, plus filtered mechanical noise. Slow shared pitch/load wander prevents a static synthesizer drone.

Body

damped cabin pressure around 95 and 210 Hz supports a broad 650-1050 Hz tyre-friction band that rises with cruising speed. Front/rear suspension responses are separated by 80-115 ms. A quieter 35-125 Hz structure-borne layer supplies weight without masking the moving road texture. Soft 18-35 ms attacks and 110-210 ms releases model occasional small road undulations, not impacts.

Air

independent left/right pink turbulence, high-passed at 480 Hz and rolled off at 1.5-3.8 kHz; a slow pressure envelope raises level and cutoff together as airflow loads the windows and pillars.

Envelope

road level wanders over seconds with weak 11-16 Hz tyre modulation. Rough asphalt adds 300-2000 Hz granular friction with smooth, irregular 6 Hz amplitude changes. No start or stop fade; the renderer crossfades the 10 s loop seam into subsequent audio.

Variation

named random streams decorrelate road, airflow, load and bump timing/strength. Presets change surface roughness, engine order/balance and window turbulence for four highway interiors.

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