耳机音域知识：乐器或人发出声音所能达到最高音与最低音之间的范围！

Earphone range knowledge: instrument or human sound can reach the treble and the bass!

三和弦是由三个音组成，包含从最低音上数第三音和第五音的。

Triads are patterns of three notes consisting of a note with a third and a fifth added, counting upwards from the lowest note.

第1小节：所有女低音、男高音和男低音声部演唱较低或他们的最低音，所有人都唱不同的音高。

M. 1: All altos , tenors and basses sing their low or lowest register, and everyone has a different pitch.

方法：用电子计算机分别测试真声最低音、舒适音、真声最高音、假声最高音的FO值。

Method:Testing FO of lowest true voice, comfortable voice, highest true voice and falsetto voice.

结果正常儿童的微扰值、规范化声门噪声能量值均为真声最低音>舒适音>真声最高音；

Results Perturbations and normalized noise energy from the highest value to the lowest one by one were that of the lowest modal voice, natural voice, the highest modal voice.