B. D. Cook, Lawrence I. Farley
Feb 1, 1974
Journal of the Acoustical Society of America
A low‐cost device has been built for obtaining a histogram of community noise levels. Signals from a sound level meter or tape recorder are appropriately rectified and level sensed by ten comparators. From the output of the comparators and a logic network, currents are furnished to a bank of electrolytic storage cells, known as E‐cells. The charge imposed on a cell is a measure of the time that the sound level is within some preestablished bounds. After a period of sampling, the E‐cells are removed from the device and the charge read by a commercial instrument.