Data modulating method and modulating and demodulating apparatus

Details Data modulating method and modulating and demodulating apparatus Data modulating method and modulating and demodulating apparatus

1996-08-12

1998-10-20

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

371 371, 341 58, H04N 100

Patent

active

058253092

ABSTRACT:
A modulating apparatus wherein input data is modulated in the case of recording code data, which can be read optically, on a recording medium, so that a number of consecutive bits of a predetermined value in the code data is less than a predetermined number of consecutive bits of the predetermined value in a reference mark (e.g., a marker in a dot code), in order to discriminate the code data from the reference mark. An 8-10 modulating apparatus for modulating 8-bit input data to 10-bit data comprises two 4-5 modulating units (memories) for converting 4-bit input data to 5-bit data. And a 10-8 demodulating apparatus for demodulating 10-bit input data to 8-bit data comprises two 5-4 demodulating units for converting 5-bit input data to 4-bit data.

REFERENCES:
patent: 4688205 (1987-08-01), Abiko
patent: 5355133 (1994-10-01), Shimpuku et al.

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