DIFF Subgroup
H03H 9/30 Time-delay networks
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators > Time-delay networks
CPC:
Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (electro-acoustic transducers such as loudspeakers, microphones or gramophone pick-ups H04R; piezoelectric, electrostrictive or magnetostrictive devices with mechanical input or output, e.g. actuators or sensors, H10N30/00, H10N35/00) > Time-delay networks
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
3 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- H03H 9/36 with non-adjustable delay time (H03H9/40, H03H9/42 take precedence) since 1980 IPC+CPC Available in IPC and CPC
- H03H 9/38 with adjustable delay time (H03H9/40, H03H9/42 take precedence) since 1980 IPC+CPC Available in IPC and CPC
- H03H 9/40 Frequency dependent delay lines, e.g. dispersive delay lines (H03H9/42 takes precedence) since 1980 IPC+CPC Available in IPC and CPC