Backup Beeper

How it's made

Source

an electronic reversing alarm drives a small horn diaphragm at 780-1450 Hz. A dominant fundamental and weaker second, third and fifth harmonics retain a single steady perceived pitch.

Body

the horn and diaphragm favour the third harmonic; a broad low-pass removes upper drive fizz. Extra upper-partial energy settles over 35 ms after each start, modelling diaphragm ring-up.

Envelope

cosine ramps of 8-18 ms surround a flat powered sustain, followed by a 12-27 ms release. The default has 0.48 s pulses every second; the 3 s loop contains three complete cycles.

Rhythm

fixed intervals of 0.75, 1 or 1.5 s all divide the loop into whole cycles without timing jitter.

Variation

seed changes device tuning by only 0.1 percent, shared by every pulse. Pitch, cadence, duty and horn colour distinguish standard, heavy-vehicle, compact and occluded-distance presets.

Space

dry centred mono; the distant preset softens edges and attenuates upper harmonics without baking in site ambience, engine noise or reverb. The frequency stays constant throughout each beep.

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