An Improved Telephone Receiver Analysis
Richard D. Fay · The Journal of the Acoustical Society of America · 1943
The method of determining the performance of electromagnetic telephone receivers from input measurements has been extended and improved. It is shown that not only may an actual receiver at any one frequency be correctly represented by a simple piston-phone but also the the position of the equivalent piston may be chosen arbitrarily, say at the mouth of the receiver. The characteristics of the equivalent piston-phone for all positions of the piston are easily found graphically from a single, simple diagram constructed from data which are readily obtained from a few input measurements. The accuracy of the method has been tested experimentally by making independent measurements at the output end of the receiver. The results check closely.