Robot Pet Chirp

How it's made

Source

a miniature robot's speaker emits two to four sine glides, with soft second/third harmonics. A small head servo contributes a 180-390 Hz motor tone and a quiet filtered bearing-noise layer.

Body

the tiny speaker emphasizes 1-4 kHz; harmonics at 2x and 3x fade faster than the fundamental. Gear-mesh whine follows motor speed at 3.1x; bearing noise passes a broad 1.2-2.6 kHz band, Q 0.8.

Envelope

8 ms note attacks, rounded 140-260 ms syllables, and 12 ms harmonic attacks avoid clicks. The servo swells over 45 ms, changes speed with the phrase, and coasts down by 670 ms; dry end at 700 ms.

Modulation

each vowel-like bleep bends continuously, with a restrained 23 Hz pitch flutter (0.25%).

Variation

seeded note tuning varies by 0.8% and onset by 3 ms; pitch scales the speaker and motor. Brightness balances upper partials; servo controls mechanical detail. Presets change contour and rhythm: curious two-note question, happy three-note rise, sleepy falling pair, or four-syllable greeting.

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