Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 MICROPHONE Fig. Wind screens for microphones. A. Bernoulli wind screen applied to a dynamic microphone. B. Wind screen consisting of a wire frame covered with sheer silk. phone. The Bernoulli ' wind screen is shown in Fig. ^^. The wind pulses travel through the screen and exert a pressure on the diaphragm. These same pulses cause a reduction in pressure at the periphery 1. These two effects tend to balance each other and, therefore, the response to wind is reduced. This typ
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 MICROPHONE Fig. Wind screens for microphones. A. Bernoulli wind screen applied to a dynamic microphone. B. Wind screen consisting of a wire frame covered with sheer silk. phone. The Bernoulli ' wind screen is shown in Fig. ^^. The wind pulses travel through the screen and exert a pressure on the diaphragm. These same pulses cause a reduction in pressure at the periphery 1. These two effects tend to balance each other and, therefore, the response to wind is reduced. This type of screen reduces the wind response about 12 db. Nonlinear Distortion in Microphones. — The sources of distortion in microphones are, in general, the same as in the case of loud speakers. The two principal causes are due to nonlinear mechanical or acoustical elements and nonuniform magnetic field in dynamic types. The latter type of distortion can be made negligible in well-designed units. For example, in a velocity microphone the amplitude of the ribbon for a plane ^^^ Olson and Massa, ' Applied Acoustics,' P. Blakiston's Son and Co., Philadel- phia. 37 Phelps, W. D., RCA Review, Vol. 3, No. 2, p. 203, 1938.
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