Signal processing not specific to the method of recording or reproducing; Circuits therefor

Introduced: January 1985

Of 8 combined children, 5 exist in both systems.

3 codes are CPC-only extensions.

IPC defines codes here since 1985.

Child Classifications

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G11B 20/00007 +3 CPC CPC only CPC only
G11B 20/00086 +17 CPC CPC only CPC only
G11B 20/00992 CPC only CPC only
G11B 20/02 Analogue recording or reproducing since 1985 +1 CPC IPC+CPC Available in IPC and CPC
G11B 20/10 Digital recording or reproducing since 1985 +9 CPC IPC+CPC Available in IPC and CPC
G11B 20/20 for correction of skew for multitrack recording since 1985 IPC+CPC Available in IPC and CPC
G11B 20/22 for reducing distortions since 1985 +1 CPC IPC+CPC Available in IPC and CPC
G11B 20/24 for reducing noise since 1985 IPC+CPC Available in IPC and CPC