Zero-Modulation Encoding in Magnetic Recording

Patel, A. M.

doi:10.1147/rd.194.0366

Cited by 89 publications

(19 citation statements)

References 9 publications

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“…This code is developed for high performance digital storage systems like high-capacity magnetic tape or disk. In next succeeding 10 years, many modifications were proposed like zero-modulation encoding and M square (M 2 ) code, to arrive a dc-free characteristic [34][35][36]. For original Miller code, logic 1 is represented by state transition at middle of each cell, and logic 0 is represented by state transition at the beginning of respective cell except for the case when a logic 0 follows a logic 1.…”

Section: Coding Schemesmentioning

confidence: 99%

Time-interleaved CMOS chip design of Manchester and Miller encoder for RFID application

Hung

2012

Analog Integr Circ Sig Process

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In this paper, we propose a modified Manchester and Miller encoder that can operate in high frequency without a sophisticated circuit structure. Based on the previous proposed architecture, the study has adopted the concept of parallel operation to improve data throughput. In addition, the technique of hardware sharing is adopted in this design to reduce the number of transistors. This circuit is realized by using TSMC CMOS 0.35-lm 2P4M technologies. The simulation results of HSPICE indicate that it functions and works successfully at 200-MHz data rate. An experimental chip had been fabricated and measured. The measured results show that the experimental chip has 50 MHz data throughput rate under 3.3-V supply voltage. The lowest supply voltage 0.6 V is achievable working at 5 kHz data rate. The average power consumption of the circuit under room temperature is 549 lW. The chip area is 70.7 lm 9 72.2 lm. The compact structure and high-speed operation are useful for radio frequency identification applications.

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Section: Coding Schemesmentioning

confidence: 99%

Time-interleaved CMOS chip design of Manchester and Miller encoder for RFID application

Hung

2012

Analog Integr Circ Sig Process

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“…Of course one seeks 424 K. Petersen codes that are efficient, have limited error propagation, and can be easily implemented-or, more realistically, ones with a compromise among these competing attributes. See [2], [17], [11], [12], [16], [21], [26], [19] for some of the previous work on this sort of problem. A further restriction arises from attempts to control the power spectrum of the encoded signal.…”

Section: The Disk Systemsmentioning

confidence: 99%

Chains, entropy, coding

Petersen

1986

Ergod. Th. Dynam. Sys.

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Abstract. Various definitions of the entropy for countable-state topological Markov chains are considered. Concrete examples show that these quantities do not coincide in general and can behave badly under nice maps. Certain restricted random walks which arise in a problem in magnetic recording provide interesting examples of chains. Factors of some of these chains have entropy equal to the growth rate of the number of periodic orbits, even though they contain no subshifts of finite type with positive entropy; others are almost sofic-they contain subshifts of finite type with entropy arbitrarily close to their own. Attempting to find the entropies of such subshifts of finite type motivates the method of entropy computation by loop analysis, in which it is not necessary to write down any matrices or evaluate any determinants. A method for variable-length encoding into these systems is proposed, and some of the smaller subshifts of finite type inside these systems are displayed.

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“…Theorem I When the code given by coding equations (1) and (2) is used for correction of single byte-errors, it will not miscorrect any combination of two one-bit errors.…”

Section: Appendix 2: Theorems On Code Capabilitymentioning

confidence: 99%

“…This arrangement requires read-write signals with zero dc component. Previous papers [1,2] reported a novel waveform design scheme referred to as "zero modulation" (ZM), which was created especially for the 3850 application. Zero modulation features waveforms with zero dc component and yet retains the advantages of other commonly known encoding methods, including high efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Error Recovery Scheme for the IBM 3850 Mass Storage System

Patel

1980

IBM J. Res. & Dev.

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The IBM 3850 Mass Storage System (MSS) stores digital data on flexible magnetic tape media; however, it is different in many respects from the conventional midtitrack tape machines. In particular, the use of a single-element rotary readwrite head imposes new demands in the areas of data encoding and error recovery. This paper presents a comprehensive scheme for error recovery for the 3850 MSS which features a new error-correction code in a serial, single-stripe data format. The recovery procedure is designed around resynchronizahle sections of data which are rendered independent of each other in error modes through the use of zero-modulation encoding and self-contained error-detection pointers. These error-detection pointers and the resynchroniiation signals are utilized in conjunction with interleaved codewords of the error-correction code. The code is designed with a generating polynomial in which the roots are chosen from the set of elements of a I6-element subfield of the Galois field GF(2^). This choice provides the necessary code structure for desired code capabilities and facilitates fast decoding of errors with an economical implementation of the decoder. The scheme provides correction capabilities for various combinations of mixed-mode short and long errors common to magnetic tape recording of digital data.

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Zero-Modulation Encoding in Magnetic Recording

Cited by 89 publications

References 9 publications

Time-interleaved CMOS chip design of Manchester and Miller encoder for RFID application

Time-interleaved CMOS chip design of Manchester and Miller encoder for RFID application

Chains, entropy, coding

Error Recovery Scheme for the IBM 3850 Mass Storage System

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