H ELECTRICITY
H03 ELECTRONIC CIRCUITRY
H03M CODING; DECODING; CODE CONVERSION IN GENERAL
7/00 Conversion of a code where information is represented by a given sequence or number of digits to a code where the same; , similar or subset of; information is represented by a different sequence or number of digits
H03M7/30 Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction