Patent Classification Explorer PCE

DIFF Main Group

H03M 3/00

Conversion of analogue values to or from differential modulation

Introduced: January 1985

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1985.

Child Classifications

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H03M 3/02 Delta modulation, i.e. one-bit differential modulation since 1985 +1 CPC IPC+CPC Available in IPC and CPC
H03M 3/04 Differential modulation with several bits since 1985 +1 CPC IPC+CPC Available in IPC and CPC
H03M 3/30 +7 CPC CPC only CPC only