Acoustical transformer for compression-type loudspeaker with an

Details Acoustical transformer for compression-type loudspeaker with an Acoustical transformer for compression-type loudspeaker with an

1980-10-10

1982-04-20

Hix, L. T.

Acoustics

Diaphragm

With horn

181185, G10K 1102

Patent

active

043254560

ABSTRACT:
An acoustical transformer or "phasing plug" for coupling the sound from an annular diaphragm to the throat of a compression-type loudspeaker. The phasing plug in the invention has the general shape of a doubly-truncated cone with an annular surface located on the larger end of the truncated cone and positioned adjacent to the diaphragm. The conical surface of the cone has spaced radial slots or channels formed therein connecting the truncated surfaces of the cone. These channels form air passageways for propagation of sound waves. The walls of the slots or channels are tapered such that the cross-sectional areas of the channels increase from their inlet ends near the speaker diaphragm, towards the outlet ends, positioned at the throat of the horn. The phasing plug provides an improved impedance match between the output of the annular diaphragm and the input of the horn.

REFERENCES:
patent: 1845768 (1932-02-01), Stokes
patent: 4050541 (1977-09-01), Henricksen

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