sub-audio frequency

• 亚音频

sub-audio frequency的用法和样例：

例句

1. In the receiver, the tone is detected right off the discriminator before any audio processing and decoded allowing the receiver to unmute.
   在接收器一端，亚音频检测器在任何音频处理前检测音频信号，如果可以翻译出亚音频信号，则允许接受机解除静音状态。