. Elements of acoustical engineering. Electro-acoustics; Sound. ELECTRICAL CIRCUIT EQUIVALENl CIRCUIT O 20 ^ A z 0. 10 1 n CROSS - SECTIONAL VIEW Fig. Cross-sectional view, electrical circuit, and equivalent circuit of an improved bi- polar telephone receiver. The graph shows the pressure response frequency characteristic of the receiver feeding a closed cavity. The dots represent response computed from equiv- alent circuit. (After Jones.) volume due to the recess in the receiver handle forms the compliance Cm2' The holes in the ear cap form the mechanical resistance rMs and the mass mz.
. Elements of acoustical engineering. Electro-acoustics; Sound. ELECTRICAL CIRCUIT EQUIVALENl CIRCUIT O 20 ^ A z 0. 10 1 n CROSS - SECTIONAL VIEW Fig. Cross-sectional view, electrical circuit, and equivalent circuit of an improved bi- polar telephone receiver. The graph shows the pressure response frequency characteristic of the receiver feeding a closed cavity. The dots represent response computed from equiv- alent circuit. (After Jones.) volume due to the recess in the receiver handle forms the compliance Cm2' The holes in the ear cap form the mechanical resistance rMs and the mass mz. The compliance Cms is due to the cavity between the ear cap and the diaphragm. The response of this receiver was taken by measuring the pressure generated in a plain cavity. This cavity is designated by the compliance Cma- The holes in the grid covering the receiver proper are large enough to have no reaction upon the response. A resilient screen of silk is mounted on the back of this grill. The mass of this screen is very small and is lumped with the diaphragm mass mo. The electrical portion of the circuit consists of the winding resistance rsi and inductance Z-i. The eddy current elements are designated as rE2 and L2. The electrical impedance due to the mechanical system is designated by the motional impedance Zem- See Sec. ^4 and equation The force/m can be obtained from equation The response computed by means of the equivalent electrical circuit is shown by the dots on the graph of Fig. The measured response is given by the curve on this graph. The agreement is very good and shows. 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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