Error correction for signals employing the modified duobinary co

Details Error correction for signals employing the modified duobinary co Error correction for signals employing the modified duobinary co

1977-09-06

1978-10-03

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

325 41, G08C 2500

Patent

active

041186869

ABSTRACT:
Single errors can be detected and corrected in a signal employing a 3-level modified duobinary code. Error correction is predicated on the concept of maximum likelihood of error for the bit having the maximum departure from normal amplitude (error differential). A converter accepts the modified duobinary signal, decodes the signal to obtain a binary output signal and determines the error differential for each bit. Bits of the binary output signals are temporarily stored in a sequential storage device. The error differential is applied to an input of an error analyzer. An error detector determines if an error has occurred during an error correction interval which interval is established by successive extreme levels of the modified duobinary signal. The error analyzer tracks the location of the bit having the largest error differential during each error correction interval. A plurality of bit correctors, one for each time slot of the sequential storage device, operate in combination with the error detector and the error analyzer to alter the bit having the highest error differential following detection of an error.

REFERENCES:
patent: 3303462 (1967-02-01), Dotter, Jr.
patent: 3337864 (1967-08-01), Lender
patent: 3343125 (1967-09-01), Lender
patent: 3461426 (1969-08-01), Lender
Mesiya et al., Maximum Likelihood Sequence Estimation of Binary Sequences, etc., IEEE Transactions on Communications, vol. Com 25, No. 7, Jul. 1977.

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