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Akustik II / Acoustics II by R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E.

By R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E. Noltingk (auth.)

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At a2 a3 a9 as Thic/mBs fo diometer rofio_ Fig. 69. The voltage sensitivity of barium titanate as a function of the thickness to diameter ratio (after LANGEVIN). stresses produce radial electric fields of the same sign which contribute most of the potential difference between the cylindrical electrodes. The radial stress pro duces a radial electrical field of opposite sign and thus reduces the potential difference between the electrodes. The relative strength of these two effects depends on the ratio ajb where a and b are the inner and outer radii, respectively.

This necessitates the introduction of an acoustic filter between the vent in the microphone case and the back surface T of the diaphragm. The mechanical equi- Fig. 51. A sectional view of a dynamic microphone. valent circuit is shown in Fig. 52. 111;. is the mass of the coil and diaphragm, C1 is the mechanical compliance of the diaphragm, R1 is the mechanical resistance referred to the diaphragm area resulting from the acoustic resistance of the porous material just below the moving coil. 2) where RA1 is the acoustic resistance of the porous material.

The dotted curve shows the pressure calibration supplied by the Bell Telephone Laborat tories (ROMANOW and HAWLEY) for the same microphone. The diffraction effecis clearly evident as the difference between the two curves. The pressure calibration indicates that the microphone was slightly over-damped as there is no evidence of a diaphragm resonance between 8 and 9 kc. The 12 db per octave decrease in sensitivity in the pressure calibration at frequencies above diaphragm resonance is to be expected from the equivalent circuit of Fig.

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