DIFF Subgroup
H04R 1/34 by using a single transducer with sound reflecting, diffracting, directing or guiding means
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 directional characteristic only > by using a single transducer with sound reflecting, diffracting, directing or guiding means
CPC:
Details of transducers, > Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) > for obtaining desired directional characteristic only > by using a single transducer with sound reflecting, diffracting, directing or guiding means
Of 4 combined children, 2 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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- H04R 1/36 by using a single aperture of dimensions not greater than the shortest operating wavelength IPC+CPC Available in IPC and CPC
- H04R 1/38 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone IPC+CPC Available in IPC and CPC