WHAT IS "MP3"? WHAT IS THE USE OF IT ?

mp3 = MPEG audio layer 3
簡單d講係一種音樂壓縮格式，約1分鐘1mb啦。
原理：佢會將類似的音域cut左，以減低音樂的size。
用途：娛樂，手機鈴聲等
以下係mp3的解釋

The name of the file extension and also the name of the type of file for MPEG, audio layer 3. Layer 3 is one of three coding schemes (layer 1, layer 2 and layer 3) for the compression of audio signals. Layer 3 uses perceptual audio coding and psychoacoustic compression to remove all superfluous information (more specifically, the redundant and irrelevant parts of a sound signal. The stuff the human ear doesn't hear anyway). It also adds a MDCT (Modified Discrete Cosine Transform) that implements a filter bank, increasing the frequency resolution 18 times higher than that of layer 2.

The result in real terms is layer 3 shrinks the original sound data from a CD (with a bit rate of 1411.2 kilobits per one second of stereo music) by a factor of 12 (down to 112-128kbps) without sacrificing sound quality.


Because MP3 files are small, they can easily be transferred across the Internet.

mp3 is a electrical appliance and used to listen music.