Macaque Troop

How it's made

Source

a macaque larynx — a voiced, harmonic source (glottal pulses ≈ saw + strong fundamental) whose F0 follows a contour per syllable, with jitter, vibrato-like undulation and, when agitated, roughness (amplitude flutter at 55–95 Hz) and turbulent breath noise riding on the pitch.

Resonance

a short vocal tract (~1.5× human formant frequencies) as a three-formant filter; the vowel moves from "u" (coos) through "a" (barks) to "e/i" (screams, chirps).

Call types

scream (吱吱尖叫, F0 1.4–2.8 kHz, wavering, 0.2–0.6 s, in escalating bouts), threat bark (short noisy "hah"), chirp (唧唧, 40–80 ms upward sweeps in runs), coo (咕咕, arched tonal 0.2–0.4 s), grunt (low pulsed). Mood weights which calls the troop makes and how often.

Modulation

a shared excitement wave (gust) makes the troop flare up and settle; each animal answers it with its own lag, so calls rise and fall one after another (此起彼伏). Every call varies in pitch, length, level.

Events

per animal, Poisson-timed bouts; each bout is one voice with breakpoint envelopes for level and F0.

Layers

N animals with their own size (pitch), loudness and place in the field; distance rolls off the top.

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