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TLVAI3254如何实现声控关闭?

Other Parts Discussed in Thread: CC3200

现在使用CC3200与TLVAI3254跑wifi_audio_app这个SDK。想实现如果发送方一段时间内没有声音,就自动关闭发送方的麦克风输入,请问如何实现呢?具体地说就是如何判断是否有人在说话?