They should not be relied upon to provide an error free method of relaying tone signalling to other decoders, such as a telephone exchange DTMF detector, for example.
它不应该被依赖用做提供一种无错的传送方法，传送双音频信号到另一解码器。例如：电话交换机的DTMF侦察器。
Whenever the audio tone of the detector sounded, a diver would mark the spot with a white cork float and return later to excavate it.
一旦探测器发出音频信号，潜水员就用软木浮标作上标记，待稍后进行挖掘。
Whenever the audio tone of the detector sounded, a diver would mark the spot with a white cork float and return later to excavate it.
一旦探测器发出音频信号，潜水员就用软木浮标作上标记，待稍后进行挖掘。
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