A Variable Single Band Acoustic Wave Filter

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Abstract
Single band acoustic filter; simple method of varying the width of the transmitted band.—An extension of the earlier theory indicates that if the size of the orifice leading into the side tube is altered, the upper limiting frequency should change while the lower limiting frequency remains constant, thus chaging the width of the band. The orifice is readily changed by introducing a cylinder of paper with punched holes of the proper size and position. Experimental results confirm the prediction as to the lower limit and give for three different orifices upper limiting frequencies of 455, 390 and 340 per sec., in fair agreement with the corresponding theoretical values 510, 440 and 385, respectively.

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