Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
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
Hayashiyama Takumi
Matsui Kazunari
Mori Takaro
Victor Company of Japan Ltd.
Williams Howard L.
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