Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction

Introduced: January 1985

Title

Titles differ between systems:

IPC: Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

CPC: Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction

Full Title

Full titles differ between systems:

IPC:

Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits > Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

CPC:

Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits > Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction

CPC subdivides this area 3x more granularly than IPC with 12 additional codes.

12 codes are CPC-only extensions, 2 exist only in IPC.

IPC defines codes here since 1985.

Child Classifications

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H03M 7/3002 +3 CPC CPC only CPC only
H03M 7/3053 CPC only CPC only
H03M 7/3055 CPC only CPC only
H03M 7/3057 CPC only CPC only
H03M 7/3059 +2 CPC CPC only CPC only
H03M 7/3066 CPC only CPC only
H03M 7/3068 +3 CPC CPC only CPC only
H03M 7/3082 CPC only CPC only
H03M 7/3084 +4 CPC CPC only CPC only
H03M 7/32 Conversion to or from delta modulation, i.e. one-bit differential modulation since 1985 −1 IPC IPC only IPC only
H03M 7/36 Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit since 1985 −1 IPC IPC only IPC only
H03M 7/40 Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code since 1985 +4 CPC −1 IPC IPC+CPC Available in IPC and CPC
H03M 7/46 Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind since 1985 IPC+CPC Available in IPC and CPC
H03M 7/50 Conversion to or from non-linear codes, e.g. companding since 1985 IPC+CPC Available in IPC and CPC
H03M 7/55 CPC only CPC only
H03M 7/60 +9 CPC CPC only CPC only
H03M 7/70 +3 CPC CPC only CPC only