While phone functions need only full duplex sound, US15W supports up to four audio streams.
当然针对电话功能来说，一个双工的音频就够了，US 15 W提供4个音频流。
Optional full-duplex audio capability is also available, with a camera-mounted microphone capturing synchronized sound.
可选择的全双工传输音频性能通过摄像机自带的麦克风捕捉同步录音。
Meanwhile, an audio codec circuit board is made to realize full-duplex communication.
同时通过自制一块语音编解码拓展板，实现了全双工通信。
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