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PCE
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DIFF Subgroup
H03F 1/32

Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Modifications of amplifiers to reduce non-linear distortion

CPC: Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)

Full Title

Full titles differ between systems:

IPC:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements > Modifications of amplifiers to reduce non-linear distortion

CPC:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements > Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)

CPC subdivides this area 6x more granularly than IPC with 5 additional codes.

5 codes are CPC-only extensions.

IPC defines codes here since 1974.

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