MPEG-1 Audio

The standard for storage and retrieval of moving pictures and audio on storage media
Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mb/s

mono and two-channel stereo
32, 44.1, 48 ksps

MPEG-1 Layer 1

CD quality requires 256-384 kb/s

lowest (encoder) complexity
32 subband polyphase analysis filterbank
512-point FFT for psychoacoustic model

DCC - Philips Digital Compact Cassette - 384kb/s

MPEG-1 Layer 2

CD quality requires 192-256 kb/s

moderate complexity
1024-point FFT for psychoacoustic model
adds more efficient coding of side information


MPEG-1 Layer 3 - "MP3"

CD quality requires 128-192 kb/s

more complexity, lower bit rate
adds frequency transform to all subbands for increased resolution
allows variable bit rate

MPEG Layer-3 Info (Fraunhofer)

Portable Players
MP3.com - MP3 Hardware Guide

NoBell Home - gjm - last update 03/23/1999