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Cc I'--. "~ " , -'. I~, -79 '""~ -83 ~, ~ " -90 ¥ 0810 f- 30 '10 60 KG /00 Fig. 59. Free·field and pressure calibrations of a Western Electric 640 AA microphone without protective grid. ). Fig. 60. ). stretched over the grooved plate E with the metalized surface turned away from the back plate. The back plate is insulated from the spherical housing by plexiglas insulators. The tension in the diaphragm is obtained by pushing the back plate against it by means of the threaded stem. The two plastic materials found to be useful for diaphragms were 10 micron styroflex and 12 micron polyethylene.

Sound levels in excess of 180 db are produced in the tube. The siren is operated at a chamber pressure of about one atmosphere and an efficiency of about 30%. 12. Air jet generators. The generation of sound by the instability of hydrodynamic flow certainly antidates all other sources. The study of the frequencies generated by subsonic jets impinging on obstacles has received considerable attention in the last one hundred years. Recently, with the advent of the jet engine, considerable attention has been given to sound generation by supersonic jets.

18. The minimal value of WI C R is unity if 11 is chosen as the frequency of the lower half power point where the sensitivity is down 3db. Examination of the behavior of Eq. 15) shows that for each doubling of R (w1C=const) reduces the total noise voltage ET by about 3db. This reduction in noise requires that the lower band limit be determined at some other point in the chain of amplification where noise generation is unimportant. Eq. 15) also indicates that a doubling of C for WI R = const, will decrease the noise ET by 6db.

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