Modulating method, modulating device and demodulating device

Details Modulating method, modulating device and demodulating device Modulating method, modulating device and demodulating device

1993-11-05

1996-04-09

Pellinen, A. D.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 68, H03M 700

Patent

active

055065813

ABSTRACT:
A modulating method, a modulating device and a demodulating device, in which it is possible to improve the digital sum value (DSV) of the coded information, modulated for transmission or recording on the recording medium, are disclosed. An encoding circuit 11 translates a sequence of input data into a sequence of coded data suitable for transmission. A pattern generating circuit 12 generates a pattern of a pre-set length at a pre-set interval inversely proportionate to the low-range cut-off frequency of the modulated coded data. A pattern inserting circuit 13 inserts the patterns into the sequence of coded data A at the pre-set interval. A modulating circuit 14 NRZI modulates the pattern-interlaced sequence of the coded data B and outputs the resulting sequence. A timing control circuit 15 controls the pattern inserting circuit 13 an so forth. The DSV of the modulated coded data may be controlled by the inserted patterns, while the increase in redundancy may be maintained at a necessary minimum value to adapt the DSV control characteristics to the specifications demanded by the transmission system.

REFERENCES:
patent: 5151699 (1992-09-01), Moriyama
patent: 5349349 (1994-09-01), Shimizume
patent: 5365231 (1994-11-01), Niimura

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