Psychoacoustics—that is the branch of psychology concerned with the perception of sound and its physiological effects.

心声学——这是心学的支， 研究声音的感知及其生效应。

The psychoacoustic algorithm finds elements in the audio that have exceptionally low volume sounds, very high-pitched sounds, or sounds very close together which the mp3 compression discards, thereby saving space and making it a lossy compression format.

心声学法在音频中查找音量极低、音调极高或声音非常接近的元素，而 mp3 压缩丢弃这些元素，从而节省空间并使其成为有损压缩格式。