. Elements of acoustical engineering. Electro-acoustics; Sound. CONDUCTOR BOLT. CROSS-SECTIONAL VIEW EQUIVALENT CIRCUIT O . B Ul .'' "- â¢~ > (^ â ^ ^ "N z o V V in 5 3 00 1000 FREQUENCY IOC Fig. Cross-sectional view and equivalent circuit of the acoustical system of an inductor telephone receiver. In the equivalent circuit Mi the inertance of the diaphragm and con- ductor. Cai and tai the acoustic capacitance and acoustic resistance of the diaphragm suspension. M2 and rAi the inertance and acoustic resistance of the bolt of silk. Ca2 and TAi the acoustic capacitance and aco
. Elements of acoustical engineering. Electro-acoustics; Sound. CONDUCTOR BOLT. CROSS-SECTIONAL VIEW EQUIVALENT CIRCUIT O . B Ul .'' "- â¢~ > (^ â ^ ^ "N z o V V in 5 3 00 1000 FREQUENCY IOC Fig. Cross-sectional view and equivalent circuit of the acoustical system of an inductor telephone receiver. In the equivalent circuit Mi the inertance of the diaphragm and con- ductor. Cai and tai the acoustic capacitance and acoustic resistance of the diaphragm suspension. M2 and rAi the inertance and acoustic resistance of the bolt of silk. Ca2 and TAi the acoustic capacitance and acoustic resistance of the cavity behind the diaphragm. Mi the inertance of the tube. Cas the acoustic capacitance of the case volume. M5 and TAi the inertance and acoustic resistance of the hole in the case. Me and tae and Cae the inertance, acoustic resistance and acoustic capacitance of the ear. p the driving pres- sure, p is/m divided by the area of the diaphragm. The graph shows the pressure response frequency characteristic. B. Receiver feeding a closed cavity, /f. Receiver feeding an artificial ear. to the ear, the nature of the acoustic impedance looking through the aper- ture of the ear cap must be considered as a part of the vibrating system. The impedance characteristic, looking through the aperture of the ear cap of a telephone receiver, is shown in Fig. , Sec. These characteristics show that the impedance is positive and increases with frequency up to 400 cycles; between 300 and 500 cycles it is practically resistive and above 400 cycles it is negative and decreases with frequency. A generalization of the requirements for maintaining constant sound pres- ^ Olson and Massa, Jour. Acous. Soc. Amer., Vol. 6, No. 4, p. 240, 1935. ^ Olson, H. F., Jour. Soc. Mot. Pic. Eng., Vol. 27, No. 5, p. 537, 1936. ^^ Olson and Massa, " Applied Acoustics," P. Blakiston's Son and Co., Phila- Please note that these images are extracted from scanned page
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