speech frequency

例句：

1. 1.The speech frequency of the speaker is 1000 Hz.
   说话者的语音频率是1000赫兹。
2. 2.The pitch of the song is very high.
   这首歌的音调非常高。
3. 3. Voice quality is an important factor in communication.
   语音质量是沟通中的一个重要因素。