CONTROL OF AMPLIFICATION

Introduced: September 1968

Description

H03G covers circuits and techniques for regulating the gain or output level of amplifiers in response to varying input signals or operating conditions. This includes automatic gain control (AGC), automatic level control (ALC), and amplitude limiting systems used in radio receivers, audio equipment, and communication devices. The classification encompasses both analog and digital control methods, feedback mechanisms, and devices that maintain relatively constant output despite input variations. Related dynamic range compression, noise gating, and signal normalization techniques fall within this scope, while the design of basic amplifier stages themselves are classified elsewhere (H03F).

Of 8 combined children, 7 exist in both systems.

1 codes are CPC-only extensions.

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

Child Classifications

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H03G 1/00 Details of arrangements for controlling amplification +1 CPC IPC+CPC Available in IPC and CPC
H03G 11/00 Limiting amplitude; Limiting rate of change of amplitude +4 CPC IPC+CPC Available in IPC and CPC
H03G 2201/00 Indexing scheme relating to subclass H03G 2nd only +7 CPC CPC only CPC only
H03G 3/00 Gain control in amplifiers or frequency changers +6 CPC IPC+CPC Available in IPC and CPC
H03G 5/00 Tone control or bandwidth control in amplifiers +1 CPC IPC+CPC Available in IPC and CPC
H03G 7/00 Volume compression or expansion in amplifiers +4 CPC IPC+CPC Available in IPC and CPC
H03G 9/00 Combinations of two or more types of control, e.g. gain control and tone control +1 CPC IPC+CPC Available in IPC and CPC
H03G 99/00 Subject matter not provided for in other groups of this subclass since 2006 IPC+CPC Available in IPC and CPC