A technique for entropy coding information relating to frequency domain audio coefficients. For portions of a frequency spectrum having a predominate value of zero, a multi-level run length encoder statistically correlates sequences of zero values with non-zero values and assigns variable length code...http://www.google.co.uk/patents/US6223162?utm_source=gb-gplus-sharePatent US6223162 - Multi-level run length coding for frequency-domain audio coding
