In this paper the problem of optimal perceptual bit allocation for MPEG Layers I and II audio coding algorithms is solved using the Breiman, Friedman, Olshen, and Stone (BFOS) algorithm. For Layer I, the bit allocation performed by the BFOS algorithm is shown to be optimal. For Layer II, the BFOS algorithm results in a near-optimum bit allocation. Details of the implementation are discussed. Experimental results verify that the BFOS algorithm out performs the ISO/IEC JTCI/SC29 bit allocation scheme in terms of the noise-to-mask ratio for a variety of sources and various rates.
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