Phase comparing and CMI/NRZ decoding apparatus

Details Phase comparing and CMI/NRZ decoding apparatus Phase comparing and CMI/NRZ decoding apparatus

1992-07-17

1993-09-28

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from nrz codes

341 68, H03M 514

Patent

active

052489698

ABSTRACT:
A phase comparing and CMI/NRZ decoding apparatus for accomplishing bit synchronization of CMI data by producing rising transition or falling transition of the clock pulse at the center of unit bit interval of incoming CMI data, by use of the clock pulse having a period equivalent to 2 unit bit intervals of CMI data, and for realizing stable decoding of CMI data to NRZ data. This apparatus is implemented by means of a data output means 2, a clock pulse generating means 1 for generating in-phase and inverse-phase pulses, a inter-transitions time interval information output means 3 for outputting information about line interval between the data transition and the clock pulse transition, a reference pulse generating means 4, a falling transition detecting and 3-step half-period shifting means 6, a rising transition detecting and 2-step half-period shifting means 5, a CMI/NRZ decoding circuit 7 and a code violation detecting means 8.

REFERENCES:
patent: 4325053 (1982-04-01), Le Brozec et al.
patent: 4400667 (1983-08-01), Belkin
patent: 4422176 (1983-11-01), Summers
patent: 4562422 (1985-12-01), Pospischil
patent: 4873524 (1989-10-01), Akkermans
patent: 5038351 (1991-08-01), Sakai et al.
patent: 5056118 (1991-10-01), Sun
patent: 5107263 (1992-04-01), Kim et al.

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