E de lisle ftai

Claim 1

FOR AN ELECTRONIC DIGITAL DATA PROCESSING SYSTEM ERROR CORRECTING APPARATUS COMPRISING: A SOURCE OF MESSAGE DIGITS; A MULTI-STAGE BUFFER REGISTER CONNECTED TO SAID SOURCE; A FIRST MULTI-STAGE PULSE SHIFTING REGISTER CONNECTED TO SAID BUFFER REGISTER; A FIRST MULTI-DIGIT PARITY WORD GENERATOR; A FIRST PULSE TRANSLATING MATRIX CONNECTING SAID SHIFTING REGISTER TO SAID PARITY WORD GENERATOR; A FIRST MULTI-STAGE RING COUNTER; MEANS INDEPENDENTLY CONNECTING INDIVIDUAL STAGES OF SAID RING COUNTER TO INDIVIDUAL STAGES OF SAID SHIFTING REGISTER; AN OUTPUT CHANNEL; MEANS FOR APPLYING A SEQUENCE OF SAID MESSAGE AND SAID PARITY DIGITS TO SAID OUTPUT CHANNEL; AN INPUT CHANNEL; INPUT MEANS FOR DERIVING A SEQUENCE OF DIGITS FROM SAID INPUT CHANNEL; A SECOND MULTI-STAGE PULSE SHIFTING REGISTER; A MULTI-STAGE ERROR PATTERN SUBWORD STORAGE REGISTER HAVING GIVEN ONES OF ITS STAGES CONNECTED TO GIVEN STAGES OF SAID SECOND SHIFTING REGISTER; A SECOND MULTI-DIGIT PARITY WORD GENERATOR; A SECOND PULSE TRANSLATING MATRIX CONNECTED BETWEEN SAID SECOND SHIFTING REGISTER AND SAID SECOND PARITY WORD GENERATOR; A SECOND PARITY WORD BUFFER REGISTER CONNECED TO SAID SECOND PARITY WORD GENERATOR; A NONMAXIMUM SEQUENCE PULSE SHIFTING REGISTER HAVING A PLURALITY OF DATA STAGES; MEANS CONNECTING DATA STAGES OF SAID NON-MAXIMUM SEQUENCE REGISTER TO DATA STAGES OF SAID SECOND PARITY WORD GENERATOR; MEANS CONNECTING DATA STAGES OF SAID NON-MAXIMUM SEQUENCE REGISTER TO GIVEN STAGES OF SAID ERROR PATTERN STORAGE REGISTER; A MULTI-STAGE MAXIMUM SEQUENCE PULSE SHIFTING REGISTER HAVING A PERIODIC CYCLE DISJOINT WITH THE PERIODIC CYCLE OF SAID NONMAXIMUM SEQUENCE GENERATOR; A SECOND MULTI-STAGE RING COUNTER; MEANS CONNECTING INDIVIDUAL STAGES OF SAID SECOND RING COUNTER TO INDIVIDUAL STAGES OF SAID SECOND PULSE SHIFTING REGISTER; MEANS FOR DUPLICATING THE DATA CONTENT OF SELECTED STAGES OF SAID NON-MAXIMUM SEQUENCE GENERATOR IN SELECTED STAGES OF SAID MAXIMUM SEQUENCE GENERATOR; MEANS FOR SIMULTANEOUSLY SHIFTING DATA THROUGH SAID SECOND SHIFTING REGISTER, SAID NON-MAXIMUM SEQUENCE REGISTER AND SAID MAXIMUM SEQUENCE REGISTER, RESPECTIVELY; MEANS RESPONSIVE TO A GIVEN RELATIONSHIP OF DATA IN SAID NON-MAXIMUM AND MAXIMUM SEQUENCE REGISTERS WITH DATA IN SAID SECOND PARITY WORD BUFFER REGISTER FOR STOPPING SAID SIMULTANEOUS SHIFTING AND CAUSING SAID ERROR PATTERN BUFFER REGISTER TO ADD THE CONTENTS OF ITS RESPECTIVE STAGES SUM-MODULO-TWO TO THE CONTENTS OF THE STAGES TO WHICH THEY ARE RESPECTIVELY CONNECTED IN SAID SECOND SHIFTING REGISTER; AND, MEANS FOR DERIVING ITS DIGITAL CONTENT FROM SAID SECOND SHIFTING REGISTER AFTER SAID ADDITION HAS BEEN PERFORMED.