Signal independent pulse code modulation data enhancer and assoc

Details Signal independent pulse code modulation data enhancer and assoc Signal independent pulse code modulation data enhancer and assoc

1994-12-12

1996-05-07

Envall, Jr., Roy N.

Excavating

371 30, G06F 1110

Patent

active

055153879

ABSTRACT:
A pulse code modulation (PCM) data enhancer which corrects bit errors using correlations between two particular PCM words received by a receiving unit separated by a predetermined time interval and a method therefor. A primary and a number of secondary pulse codes are stored in a first-in-first-out (FIFO) memory. The primary pulse code is modified, and the modified and secondary pulse codes provide addresses to a memory storing the probability of a transition between the modified pulse code and each of the secondary pulse codes. The probabilities are then accumulated, and the modified pulse code resulting in the greatest accumulated probability is output as an error-corrected data word.

REFERENCES:
patent: 4758902 (1988-07-01), Okamoto et al.
patent: 4794600 (1988-12-01), Shaw-Yueh
patent: 4799221 (1989-01-01), Fukami et al.
patent: 4829525 (1989-05-01), Sugiyama et al.
patent: 4943964 (1990-07-01), Hatanaka et al.

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