Insertion of ones and zeroes into I-NRZI modulatio

专利名称：Insertion of ones and zeroes into I-NRZI

modulation for magnetic recordingapparatus to facilitate head tracking

发明人：Soon-tae Kim申请号：US08472275申请日：19950607公开号：US06384996B1公开日：20020507

专利附图：

摘要：In digital signal recording apparatus using I-NRZI modulation for recording, theneed for intermittently reading or intermittently writing buffer storage is eliminated by

using parallel-bit precoding to generate the channel words that are selected betweenfor recording. The precoders perform preceding on an accelerated basis using ripple-through integration of the alternate successive bits used to form each channel word. Twoprecoders generate (n+1)-parallel-bit channel words at a channel word rate slower by afactor of (n+1) than the rate of a system clock for the I-NRZI modulation. This leavesadditional time during each channel word interval to carry out a decision procedure, whichdetermines which of the channel words generated by the two precoders is to be selectedfor recording. There is also sufficient additional time for completing a subsequentupdating procedure, in which precoding information stored in the precoder that did notgenerate the selected channel word is altered, to conform to preceding informationstored in the precoder that did generate the selected channel word. The parallel-bitchannel words from the precoders are converted to serial-bit format for recording with abit rate equal to that of the system clock. The parallel-bit channel words from theprecoders are converted to serial-bit format with an effective bit rate that is substantiallyhigher than that of the system clock, to provide signal for timely implementing thedecision and updating procedures.

申请人：SAMSUNG ELECTRONICS CO., LTD.

代理机构：Sughrue Mion, PLLC

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