proctor-ai-sdk/src/audio/voiceDetector.js

A powerful SDK for preventing cheating during online exams using face detection, voice detection, and tab monitoring.

//⬅️ Detect background voice

let audioContext, analyser, source, micStream, voiceInterval;
export const startVoiceDetection = (threshold = 0.1, interval = 1000, logFn) => {
  navigator.mediaDevices.getUserMedia({ audio: true }).then((stream) => {
    audioContext = new AudioContext();
    micStream = stream;
    source = audioContext.createMediaStreamSource(stream);
    analyser = audioContext.createAnalyser();
    source.connect(analyser);
    const data = new Uint8Array(analyser.fftSize);
    voiceInterval = setInterval(() => {
      analyser.getByteFrequencyData(data);
      const avg = data.reduce((a, b) => a + b, 0) / data.length / 255;
      if (avg > threshold) {
        if (logFn) logFn("background-voice-detected");
      }
    }, interval);
  });
};

export const stopVoiceDetection = () => {
  clearInterval(voiceInterval);
  if (micStream) {
    micStream.getTracks().forEach((track) => track.stop());
  }
  if (audioContext) audioContext.close();
};