Method of Improving Acoustic Transmission in Folded Horns
Richard W. Carlisle · The Journal of the Acoustical Society of America · 1959
A novel principle has been developed, applicable to folded horns, for improving the acoustic transmission around bends having a radius greater than one-quarter wavelength. This consists of the use of a conoidal reflecting type surface in the outer half of the fold. It is beneficial in the frequency-special region between the usual horn wave expansion action and transmission by specular or optical type reflection. A practical application is described.