High frequency horn

Details High frequency horn High frequency horn

1980-10-28

1983-05-03

Pellinen, A. D.

Acoustics

Diaphragm and enclosure

With horn

181DIG1, 181159, 181184, 181192, 1791155H, 179180, H05K 500

Patent

active

043818315

ABSTRACT:
A loudspeaker horn is described, which produces good coupling of sound to the atmosphere, while avoiding perturbations in magnitude and phase that would produce large narrow-frequency losses or transient distortions. The horn includes a major sound-reflective portion of typical horn shape, and also includes a buffer extending around the large end of the horn. The buffer has a sound absorption coefficient about halfway between the almost zero absorption coefficient of the major portion of the boundary walls of the horn and the 100% absorption coefficient of the ambient atmosphere, to couple sound to the atmosphere more efficiently, and with an efficiency that is relatively constant with frequency. A horn of largely rectangular cross-section, has corner regions covered with highly sound absorbing material, to minimize transient distortions such as "ringing".

REFERENCES:
patent: 3356179 (1967-02-01), Tomkins
patent: 3982607 (1976-08-01), Evans
patent: 4171734 (1979-10-01), Peveto et al.
patent: 4283606 (1981-08-01), Buck
H. M. Tremaine, Audio Cyclopedia, 1977, para. #2-34.

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