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Tempo

Audio Tempo

The speed or pace of an audio track, measured in beats per minute (BPM).

技術的詳細

In the audio processing pipeline, tempo affects how sound is captured, stored, and reproduced. Digital audio fundamentals — sample rate, bit depth, and channel count — determine the theoretical quality ceiling. The Web Audio API provides browser-native DSP (Digital Signal Processing) capabilities including gain control, filtering, spatialization, and real-time analysis. Understanding tempo is essential for optimizing audio delivery, where format choice can reduce file sizes by 70-90% with minimal perceptible quality loss.

```javascript
// Tempo: Web Audio API example
const audioCtx = new AudioContext();
const response = await fetch('audio.mp3');
const buffer = await audioCtx.decodeAudioData(await response.arrayBuffer());
const source = audioCtx.createBufferSource();
source.buffer = buffer;
source.connect(audioCtx.destination);
source.start();
```

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