four-channel control mode 四通道控制方式
The sound channel select mode and the volume control with intelligentized.
声道模式智能选择及智能音量控制。
The messages cover receiving and transmitting capabilities as well as mode preference from the receiving end, logical channel signalling, and Control and Indication.
终端信息消息不仅包括来自接收端的通信方式优先级、逻辑信道信令、控制与指示，而且也包括接收和传输能力。
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