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怎样在智能设备中实现低延迟的语音控制?

2025-08-25 1.3 K

实施背景

嵌入式设备常受限于计算资源,需平衡响应速度与识别精度。Dolphin提供两种模型适应不同硬件条件。

integrated solution

  • hardware adaptation::
    Equipment type recommendation model memory footprint
    树莓派4B base <500MB
    Jetson Nano small <1.2GB
  • Optimization Tips::
    1. 预加载模型到内存
      model = dolphin.load_model("base", "/models/", "cpu")
    2. 启用流式处理(代码示例见GitHub的streaming分支)

延迟控制

通过三阶段优化:
1. 音频采集:使用16kHz采样率+单声道
2. segmentation:设置VAD分段阈值为300ms
3. Results Cache:实现最近5秒语音环形缓冲区

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