Abstract
Acoustic measurements are often facilitated by the use of an electronic device with output consisting of a direct current which is proportional to the logarithm of the a.c. input voltage. A uniform decibel scale is obtained when such a device is used in conjunction with a linear indicator, such as a cathode-ray tube or a d.c. meter. The several circuits to perform this function which have been described previously have depended upon approximate logarithmic characteristics of vacuum tubes. The present paper outlines methods for securing from combinations of passive circuit elements a response which in principle is rigorously logarithmic. The logarithmic time-voltage characteristic of an impulse-excited resistance-capacity circuit is considered in particular. A brief description is given of a specific circuit which produces logarithmic indication over a 20–30 db range. The more important practical design limitations are mentioned.
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