Car Alarm Cycle

How it's made

Source

an electronic car-alarm driver excites a small horn diaphragm with a swept periodic waveform. Five phase-coherent partials at 1:2:3:4:5 model the driven diaphragm rather than a bare sine.

Body

a broad 1.7 kHz horn emphasis and a 3.2–6 kHz low-pass colour the harmonic stack; upper partials weaken on higher notes. A 1.8 ms, -24 dB mouth reflection adds a short physical cavity response.

Envelope

an eight-second cycle contains four two-second phrases: wail, yelp, alternating tones, and falling chirps. Each phrase has 14 ms raised-cosine edges; chirps have 9 ms soft gates.

Modulation

wails sweep 650–1550 Hz at nominal tuning, yelps sweep four times a second, high/low tones alternate every 250 ms, and chirps fall over 160 ms four times a second.

Variation

seeded driver tolerance is +/-0.25 percent and remains fixed for the entire loop. Pitch scales the driver; brightness changes diaphragm harmonics and bandwidth; cadence changes rates.

Presets

classic four-tone cycle, urgent fast cycle, lower rounded horn, and bright compact siren. The source is dry and centred, with no environmental reverb or unrelated background noise.

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