冗じょう長ちょう符ふ号ごう

Meanings

1

redundancy code

Technical term in computing and information theory for a code that adds extra bits to detect or correct errors.

冗じょう長ちょう性せい
冗長性 is the general concept of redundancy, while 冗長符号 specifically refers to a code that implements redundancy for error control.
誤あやまり訂てい正せい符ふ号ごう
誤り訂正符号 is an error-correcting code, a broader category that includes redundancy codes but also more complex schemes.

Compound of 冗長 (redundant) and 符号 (code, sign). The exact historical derivation is uncertain; the term is a modern technical coinage.