digital tuning indicator

例句：

1. 1. The digital tuner is used to adjust the volume of the audio signal.
   数字调谐器用于调整音频信号的音量。
2. 2. The digital tuner indicator on the car radio displays the current volume level.
   汽车收音机上的数码调谐器指示器显示当前的音量水平。
3. 3.The digital tuner indicator in the music player shows the song's tempo and pitch.
   音乐播放器中的数码调谐器指示器显示歌曲的速度和音高。