Electro-acoustic calling devices

Details Electro-acoustic calling devices Electro-acoustic calling devices

H - Electricity

04

R

349/80

H04R 1/22 (2006.01)

Patent

CA 1215163

ABSTRACT An electro-acoustic calling device of the kind having an electro-acoustic transducer mounted in a housing in which volume control is provided by an aperture in the front of the housing and a rotatable shutter plate which is mounted on the front of the housing and which has a plurality of smaller apertures. The smaller apertures are positioned in such a way that linear movement of the shutter plate causes a logarithmic change in the exposure of the aperture in the front of the housing to give a logarithmic change in the intensity of the sound output such that the linear movement causes an apparent linear change in the intensity of sound as heard by a human ear.

421729

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