Apparatus for the processing of an information stream with the a

Details Apparatus for the processing of an information stream with the a Apparatus for the processing of an information stream with the a

1980-09-08

1982-10-12

Atkinson, Charles E.

Excavating

371 45, G06F 1110

Patent

active

043542697

ABSTRACT:
A sequence of k-tuples of information elements is converted by means of an error-correcting convolutional code into a sequence of n-tuples (n greater than k) of code elements. In the processing of the code elements use is made of first of all a syndrome former to form a sequence of (n-k)-tuples of syndrome elements from the n-received sequence of n-tuples of code elements. From a segment of a number of successive (n-k)-tuples of syndrome elements one or more correction bits are formed in each case so as to be able to correct the received code bits and also, if a correction is applied, to be able to update a number of further syndrome bits from that same segment. Furthermore an (n-k)-tuple of secondary syndrome bits or residue bits is formed in each case from this updated segment. A first value of such an (n-k)-tuple indicates the state in which the decoder must be provisionally considered as having corrected all errors in a predetermined sequence of n-tuples of code elements. Any other values indicate that an error has remained uncorrected. Such other values are converted into unreliability signals. The unreliability signal indicates a sub-sequence of n-tuples of code elements, in which the errors not corrected are located. Outside this sub-sequence the n-tuples can be reliable again.

REFERENCES:
patent: 3402393 (1968-09-01), Massey
patent: 3508197 (1970-04-01), Tong
patent: 3588819 (1971-06-01), Tong
patent: 3593282 (1971-07-01), Tong
patent: 3697947 (1972-10-01), Macy
patent: 4291406 (1981-09-01), Bahl et al.

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