Patent ID: 6483882
Filing Date: 2002-11-19
Classification: G11B

Abstract:
An apparatus for demodulating a first form of digital information into a second form of digital information; the apparatus comprising:a source of changing digital information expressed as a series of binary words of N bits each; a look-up table memory device storing a plurality of M-bit words where M is less than N, a first plurality of said N-bit words corresponding one for one to said M-bit words and a second plurality of said N-bit words addressing M-bit words corresponding to the most similar N-bit word of said first plurality of N-bit words, said look-up table memory device receiving said first and second pluralities of N-bit words as addresses to said plurality of stored binary M-bit words; and a converter for converting each of said second plurality of N-bit words to a most similar one of said first plurality of N-bit words based upon a series of tests comparing respective bits, respective groups of bits and respective bit transitions of said first and second pluralities of N-bit words, each said second plurality of N-bit words being received by said memory device as an address for an M-bit word equal to the M-bit word corresponding to the selected most similar one of said first plurality of N-bit words resulting from said tests.