Digital modulating method

Details Digital modulating method Digital modulating method

1990-10-26

1993-04-27

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

Byte length changed

341102, H03M 720

Patent

active

052066460

ABSTRACT:
This invention relates to a digital modulating method used for recording a PCM audio signal, computer data, and etc. on a recording medium such as an optical disc. The digital modulating method is constructed so that the minimum length between transition could be the maximum in encoding M bits into N bits (M<N), and can generate clock pulses with a simple circuit arrangement by satisfying the relationship N=.alpha.M, where .alpha. is an integer equal to or larger than 2.
Further, by converting a predetermined unit of input data into a first code signal according to substantially the same conversion rule and selectively adding coupling bits of different bit number to each junction between a first code signal and an adjacent code signal, the digital modulating method is adaptable for various transmission systems with a simple arrangement.

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Frequencz, vol. 40, No. 7, Jul. 1986, "Optimization of the Receiving-Filtering of Magneto-Optical Recorded EFM-Coded Digital Signals".

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