APPARATUS AND METHOD EMPLOYING MODIFIED ZERO MODULATION DATA CODE

APPARATUS AND METHOD EMPLOYING MODIFIED ZERO MODULATION DATA CODE An apparatus and method of processing data employs a modification of a zero modulation code. The zero modulation code has a waveform that is symmetrical about a zero signal level within narrow defined limits. Each data digit, 1 or 0,...

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Bibliographische Detailangaben
1. Verfasser:	OUCHI, NORMAN K
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING CODE CONVERSION IN GENERAL CODING COMPUTING COUNTING DECODING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Zusammenfassung:	APPARATUS AND METHOD EMPLOYING MODIFIED ZERO MODULATION DATA CODE An apparatus and method of processing data employs a modification of a zero modulation code. The zero modulation code has a waveform that is symmetrical about a zero signal level within narrow defined limits. Each data digit, 1 or 0, is encoded into two NRZI digits. Only five charge states are needed. A relaxed run length limitation allows a (d,k) code of 1,4, where (d) is the lower frequency limit and (k) is the upper frequency limit, the limits defining the range from (d) to (k) inclusive of the number of 0 digits that may intervene between the last digit in a preceding code word and the first digit 1 of the current code word, without violating the frequency and charge constraints. During encoding, only one bit lookahead is needed.