Modulated-carrier systems

Introduced: September 1968

CPC subdivides this area 2x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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H04L 27/0002 CPC only CPC only
H04L 27/0004 CPC only CPC only
H04L 27/0006 CPC only CPC only
H04L 27/0008 CPC only CPC only
H04L 27/001 CPC only CPC only
H04L 27/0012 CPC only CPC only
H04L 27/0014 +5 CPC CPC only CPC only
H04L 27/01 Equalisers since 1990 IPC+CPC Available in IPC and CPC
H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation (H04L27/32 takes precedence) IPC+CPC Available in IPC and CPC
H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
H04L 27/26 Systems using multi-frequency codes (H04L27/32 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26 since 1990 IPC+CPC Available in IPC and CPC