Run-length limited code without dc level

Details Run-length limited code without dc level Run-length limited code without dc level

H - Electricity

03

M

354/67, 352/19.1

H03M 5/14 (2006.01) G11B 20/14 (2006.01) H03M 7/40 (2006.01) H04L 25/49 (2006.01)

Patent

CA 1285650

YO984052 RUN-LENGTH LIMITED CODE WITHOUT DC LEVEL ABSTRACT OF THE DISCLOSURE Code modification circuitry alters the end portion of each block in a sequence of code blocks, and also inserts additional bits at the junction between contiguous blocks. The codes to be processed are run- length limited (RLL) codes having a DC component which is to be removed for certain applications such as magnetic recording. The modification circuitry retains the RLL format. Charge (or the integral of the waveform) accumulated by the sequence of bits of one block is compensated by selecting the sense of charge accumulation in next block to be of opposite sense. This is accomplished by the code modification circuitry using a relatively small set of possible combinations of digital words at the junctions of the blocks.

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