Coded data generation or conversion – Digital code to digital code converters – To or from nrz codes
Patent
1997-06-09
1999-03-02
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from nrz codes
360 41, G11B 509
Patent
active
058777121
ABSTRACT:
In digital signal recording apparatus using I-NRZI modulation for recording, the need for intermittently reading or intermittently writing buffer storage is eliminated by using parallel-bit preceding to generate the channel words that are selected between for recording. The precoders perform precoding on an accelerated basis using ripple-through integration of the alternate successive bits used to form each channel word. Two precoders generate (n+1)-parallel-bit channel words at a channel word rate slower by a factor of (n+1) than the rate of a system clock for the I-NRZI modulation. This leaves additional time during each channel word interval to carry out a decision procedure, which determines which of the channel words generated by the two precoders is to be selected for recording. There is also sufficient additional time for completing a subsequent updating procedure, in which precoding information stored in the precoder that did not generate the selected channel word is altered, to conform to preceding information stored in the precoder that did generate the selected channel word. The parallel-bit channel words from the precoders are converted to serial-bit format for recording with a bit rate equal to that of the system clock. The parallel-bit channel words from the precoders are converted to serial-bit format with an effective bit rate that is substantially higher than that of the system clock, to provide signal for timely implementing the decision and updating procedures.
REFERENCES:
patent: 5642241 (1997-06-01), Kim
Hoff Marc S.
Jean-Pierre Peguy
Limberg Allen LeRoy
Samsung Electronics Co,. Ltd.
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