Digital modulating/demodulating method and apparatus using same

Details Digital modulating/demodulating method and apparatus using same Digital modulating/demodulating method and apparatus using same

1995-07-10

1997-06-10

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

34 69, 360 41, H03M 700

Patent

active

056380640

ABSTRACT:
Digital modulating method and apparatus are provided which converts m-bit data codes, in sequence, into digital modulation codes each consisting of n channel bits (n>m) to form a modulation code sequence using connection codes. Bit patterns of portions of the modulation code sequence and the connection codes are changed or additional bit patterns are inserted into the modulation code sequence so as to meet given conditions of a minimum transition interval, a maximum transition interval, and a Digital Sum Value. Demodulating method and apparatus performing a reverse modulation operation are also described.

REFERENCES:
patent: 4323931 (1982-04-01), Jacoby

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