本发明的车辆导航装置监测车辆速度，并根据车辆速度变化自动调节语音服务音量。
It monitors the speed of the vehicle and regulates the volume of phonetic service automatically based on the varying vehicle speed.
智能音量-自动调节声音保持一致的音量响度。
Smart volume - Automatically adjusts the loudness of a voice to maintain a consistent volume level.
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