for obtaining desired frequency characteristic only

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of transducers > Arrangements for obtaining desired frequency or directional characteristics > for obtaining desired frequency characteristic only

CPC:

Details of transducers, > Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) > for obtaining desired frequency characteristic only

Of 7 combined children, 4 exist in both systems.

3 codes are CPC-only extensions.

4 shared codes have differing titles between IPC and CPC.

Child Classifications

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H04R 1/222 CPC only CPC only
H04R 1/225 CPC only CPC only
H04R 1/227 CPC only CPC only
H04R 1/24 Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges +1 CPC IPC+CPC Available in IPC and CPC
H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges +1 CPC IPC+CPC Available in IPC and CPC
H04R 1/28 Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means +3 CPC IPC+CPC Available in IPC and CPC
H04R 1/30 Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G10K; ) IPC+CPC Available in IPC and CPC