characterised by the use of pulse modulation (in radio transmission relays H04B7/17)

Introduced: January 1985

Title

Titles differ between systems:

IPC: characterised by the use of pulse modulation

CPC: characterised by the use of pulse modulation (in radio transmission relays H04B7/17)

Full Title

Full titles differ between systems:

IPC:

Transmission systems not characterised by the medium used for transmission > characterised by the use of pulse modulation

CPC:

Transmission systems not characterised by the medium used for transmission (details thereof H04B1/00) > characterised by the use of pulse modulation (in radio transmission relays H04B7/17)

Of 4 combined children, 2 exist in both systems.

2 codes are CPC-only extensions.

IPC defines codes here since 1985.

Child Classifications

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H04B 14/023 CPC only CPC only
H04B 14/026 CPC only CPC only
H04B 14/04 using pulse code modulation since 1985 +3 CPC IPC+CPC Available in IPC and CPC
H04B 14/06 using differential modulation, e.g. delta modulation since 1985 +2 CPC IPC+CPC Available in IPC and CPC