MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M)

Introduced: September 1968

Description

H03C covers electronic circuits and devices for modulating signals, where information is encoded onto a carrier wave by varying one or more of its characteristics (amplitude, frequency, phase, or pulse properties). This subclass encompasses modulator designs, modulation techniques, and integrated circuit implementations across analog and digital domains, including amplitude modulation (AM), frequency modulation (FM), phase modulation (PM), and pulse modulation methods. Related demodulation circuits are classified separately under H03D, while specific modulation applications in telecommunications, broadcasting, and radar systems may be further detailed in their respective technology classes.

Title

Titles differ between systems:

IPC: MODULATION

CPC: MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M)

Full Title

Full titles differ between systems:

IPC:

MODULATION

CPC:

MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M)

Of 6 combined children, 5 exist in both systems.

1 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

4 shared codes have differing titles between IPC and CPC.

Child Classifications

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H03C 1/00 Amplitude modulation (H03C5/00, H03C7/00 take precedence) IPC+CPC Available in IPC and CPC
H03C 2200/00 Indexing scheme relating to details of modulators or modulation methods covered by H03C 2nd only +2 CPC CPC only CPC only
H03C 3/00 Angle modulation (H03C5/00, H03C7/00 take precedence) +1 CPC IPC+CPC Available in IPC and CPC
H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal (H03C7/00 takes precedence) IPC+CPC Available in IPC and CPC
H03C 7/00 Modulating electromagnetic waves (devices or arrangements for the modulation of light G02F1/00) IPC+CPC Available in IPC and CPC
H03C 99/00 Subject matter not provided for in other groups of this subclass since 2006 IPC+CPC Available in IPC and CPC