Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Modulated-carrier systems > Carrier systems characterised by combinations of two or more of the types covered by groups , , , or > Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

CPC:

Modulated-carrier systems > Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26 > Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

CPC subdivides this area 3x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

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H04L 27/3405 +3 CPC CPC only CPC only
H04L 27/345 +2 CPC CPC only CPC only
H04L 27/3488 CPC only CPC only
H04L 27/3494 CPC only CPC only
H04L 27/36 Modulator circuits; Transmitter circuits since 1990 +4 CPC IPC+CPC Available in IPC and CPC
H04L 27/38 Demodulator circuits; Receiver circuits since 1990 +4 CPC IPC+CPC Available in IPC and CPC