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PCE
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DIFF Subgroup
G01R 23/16

Spectrum analysis; Fourier analysis

Introduced: September 1968

Full Title

Arrangements for measuring frequencies; Arrangements for analysing frequency spectra > Spectrum analysis; Fourier analysis

IPC and CPC are identically structured here. All 8 subcodes exist in both systems.

Child Classifications

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  • G01R 23/163 adapted for measuring in circuits having distributed constants since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/17 with optical auxiliary devices since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/173 Wobbulating devices similar to swept panoramic receivers since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/175 by delay means, e.g. tapped delay lines since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/177 Analysis of very low frequencies since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/18 with provision for recording frequency spectrum IPC+CPC Available in IPC and CPC
  • G01R 23/20 Measurement of non-linear distortion IPC+CPC Available in IPC and CPC