. Elements of acoustical engineering. Electro-acoustics; Sound. 270 MEASUREMENTS uator. The voltage across the receivers is adjusted until the intensity in the observer's ear seems to be the same as the free wave intensity from the loud speaker. This procedure is repeated at several frequencies, keeping the free wave pressure constant. The reciprocal of the voltage across the phones required to match the free wave sound intensity is proportional to the sensitivity of the receivers at each frequency. B. Objective Measureynents 3i-32,33,33a_ — ^he impedance frequency char- acteristic looking thr
. Elements of acoustical engineering. Electro-acoustics; Sound. 270 MEASUREMENTS uator. The voltage across the receivers is adjusted until the intensity in the observer's ear seems to be the same as the free wave intensity from the loud speaker. This procedure is repeated at several frequencies, keeping the free wave pressure constant. The reciprocal of the voltage across the phones required to match the free wave sound intensity is proportional to the sensitivity of the receivers at each frequency. B. Objective Measureynents 3i-32,33,33a_ — ^he impedance frequency char- acteristic looking through the ear cap of a telephone receiver as normally worn has been investigated by Inglis, Gray and Jenkins. These are shown in Fig. An artificial ear and the equivalent circuit which yields approximately the same impedance characteristic is shown in Fig. A standard condenser microphone is used to measure the Zao'IVo+J^ -j-VA^^-V^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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