Modulation device and demodulation device and methods of the sam

Details Modulation device and demodulation device and methods of the sam Modulation device and demodulation device and methods of the sam

1997-10-24

1999-09-14

Young, Brian

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

H03M 746

Patent

active

059529440

ABSTRACT:
A modulation device and a demodulation device suitably performing DSV control while reducing the size and lowering the price of the hardware. Recording data is modulated at a modulator. In a DSV calculator, the DSV value of a modulated data is calculated in units of 1 DSV frame. A comparator outputs a sign comparison result of a DSV value cumulatively added from the start of recording and a DSV value to a DSV control bit insertion unit. The DSV control bit insertion unit inserts bits of DSV control data in accordance with the comparison result at a predetermined insertion position of the modulated data delayed by exactly an amount of 1 DSV frame. Thereafter, the modulated data is subjected to NRZ modulation.

REFERENCES:
patent: 5682153 (1997-10-01), Ishiguro

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