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。

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By using AT89C51, the control part sets the system operation mode and adjusts the output volume.

控制模块采用微控制器at89c51，完成系统的模式设定和音量控制。

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While volume adjusting is evoked, default volume is collected under the mode of open loop control.

当音量调节操作时，则在开环形式下完成默认音量的采样更新。

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Volume buttons on the remote offer a convenient way to control audio while private listening mode is in use.

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