REDUNDANCY

1. In the transmission of data , the excess of transmitted message symbols over that required to convey the essential information in a noise -free circuit . Note: Redundancy may be introduced intentionally (as in the case of error detection or correction codes) or inadvertently (such as by oversampling a band -limited signal , inefficient formats, etc. ). 2. In a communication system , surplus capability usually provided to improve the reliability and quality of service . ( 188 )