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[eric] voice: start/stop cues are soft percussive pops, not sine chimes (ENG-168)

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ciregenz
2026-08-05 18:15:09 -07:00
parent d9813de3cd
commit 1ad97f4dd2
1 changed files with 33 additions and 11 deletions
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frontend/src/shared/voice/voiceCues.ts
+33 -11
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@@ -1,6 +1,6 @@
// WhisperFlow-grade start/stop chimes, synthesized in WebAudio so they ship weightless and always
// match: a soft two-note rise on start ("I'm listening"), the mirrored fall on stop. Sine + gentle
// lowpass + fast attack / exponential release = crisp but soothing, never a system beep.
// WhisperFlow-grade start/stop cues, synthesized in WebAudio so they ship weightless and always
// match. Not a chime: a soft percussive "pop" (tiny click transient + falling tone), like a water
// drop. Start pops slightly higher than stop, so the pair reads as press/release, not as an alarm.
let ctx: AudioContext | null = null;
@@ -14,16 +14,38 @@ function ensureCtx(): AudioContext | null {
}
}
function blip(ac: AudioContext, freq: number, at: number, dur: number, peak: number): void {
// The transient: 6ms of bandpassed noise gives the pop its tactile "tick" edge.
function tick(ac: AudioContext, at: number, freq: number, peak: number): void {
const len = Math.floor(ac.sampleRate * 0.006);
const buf = ac.createBuffer(1, len, ac.sampleRate);
const data = buf.getChannelData(0);
for (let i = 0; i < len; i++) data[i] = (Math.random() * 2 - 1) * (1 - i / len);
const src = ac.createBufferSource();
src.buffer = buf;
const bp = ac.createBiquadFilter();
bp.type = 'bandpass';
bp.frequency.value = freq;
bp.Q.value = 1.2;
const gain = ac.createGain();
gain.gain.value = peak;
src.connect(bp);
bp.connect(gain);
gain.connect(ac.destination);
src.start(at);
}
// The body: a sine gliding down fast with an exponential decay reads as a "plop", not a beep.
function pop(ac: AudioContext, at: number, from: number, to: number, dur: number, peak: number): void {
const osc = ac.createOscillator();
const gain = ac.createGain();
const lp = ac.createBiquadFilter();
lp.type = 'lowpass';
lp.frequency.value = 2400;
lp.frequency.value = 3200;
osc.type = 'sine';
osc.frequency.setValueAtTime(freq, at);
osc.frequency.setValueAtTime(from, at);
osc.frequency.exponentialRampToValueAtTime(to, at + dur * 0.7);
gain.gain.setValueAtTime(0, at);
gain.gain.linearRampToValueAtTime(peak, at + 0.012);
gain.gain.linearRampToValueAtTime(peak, at + 0.006);
gain.gain.exponentialRampToValueAtTime(0.0004, at + dur);
osc.connect(lp);
lp.connect(gain);
@@ -37,10 +59,10 @@ export function playVoiceCue(kind: 'start' | 'stop'): void {
if (!ac) return;
const t = ac.currentTime + 0.01;
if (kind === 'start') {
blip(ac, 587, t, 0.16, 0.055);
blip(ac, 880, t + 0.085, 0.2, 0.05);
tick(ac, t, 2200, 0.05);
pop(ac, t, 760, 520, 0.11, 0.06);
} else {
blip(ac, 880, t, 0.14, 0.045);
blip(ac, 587, t + 0.075, 0.22, 0.05);
tick(ac, t, 1600, 0.04);
pop(ac, t, 520, 360, 0.13, 0.055);
}
}