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

心——这是心一个分支， 研究音感知及其生效应。

In psychoacoustic research, so much of the things that we know about the sound world were developed either for telephony or for the military.

在心研究领域，们对音诸多认知，大多源自于为电话通讯或军事用途而进行研发。

This 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.

这种心算法会找到音频中音量极低音、音调极高或非常接近音，这些音被MP3压缩丢弃，从而节省空间，使其成为有损压缩格式。