The recent ISO/MPEG Audio coding standard combines features of MUSICAM(Masking pattern adapted Universal Subband Integrated Coding And Multiplexing) and ASPEC(Adaptive Spectral Perceptual Entropy Coding). The recent ISO/MPEG Audio coding standard consists of three layers(codes) of increasing complexity and improving subjective performance. It supports sampling rates of 32, 44.1 and 48 kHz, and bit rates per monophonic channel between 32 and 192kb/s, or per stereophonic channel between 128 and 384 kb/s. The standard offers the single channel mode, the stereo mode, the dual channel mode(to provide bilingual audio programs), and the optional joint stereo mode. In this later mode the two coders for the left and right channel can support each other by exploiting statistical dependencies and irrelevancies between these channels to compress the audio bit rate to even higher degree than is possible in monophonic transmission. A so called intensity stereo mode is optional in the ISO/MPEG standard