4.2 ISOMPEG AUDIO CODING STANDARDS
The Moving Pictures Experts Group (MPEG) within the International Organization for Standardization (ISO) has developed a series of audio coding standards for storage and transmission of various digital media. The ISO standard specifies a syntax for only the coded bit streams and the decoding process; sufficient flexibility is allowed for encoder implementation. The MPEG first phase (MPEG-1) audio coder operates in single- or two channel stereo mode at sampling rates of 32, 44. 1, and 48 kHz. In the second phase of development, particular emphasis is placed on the multichannel audio support and on an extension of MPEG-1 to lower