. Elements of acoustical engineering. Electro-acoustics; Sound. CMSfMS EQUIVALENT O-30 B ^*/ "^ x» \ / ^ - A CROSS-SECTIONAL VIEW Fig. Cross-sectional view and equivalent circuit of an improved single button carbon microphone. The open circuit voltage response characteristics are shown by the graph. A. Response in free space. B. Response for constant sound pressure on the diaphragm. Dots computed from equivalent circuit. (After Jones.) depicts uniform response in the low frequency range below the funda- mental resonance frequency. In the region of the resonance frequency the output i
. Elements of acoustical engineering. Electro-acoustics; Sound. CMSfMS EQUIVALENT O-30 B ^*/ "^ x» \ / ^ - A CROSS-SECTIONAL VIEW Fig. Cross-sectional view and equivalent circuit of an improved single button carbon microphone. The open circuit voltage response characteristics are shown by the graph. A. Response in free space. B. Response for constant sound pressure on the diaphragm. Dots computed from equivalent circuit. (After Jones.) depicts uniform response in the low frequency range below the funda- mental resonance frequency. In the region of the resonance frequency the output is accentuated. In the range above the resonance frequency the response falls off rapidly with frequency in a series of peaks and dips which indicate vibrations of the diaphragm or plate in the various modes. See Sec. A new type of single carbon button microphone^ has been developed in which the response is quite uniform over a wide frequency range. (Fig. ) The conical diaphragm is made of a thin aluminum alloy. At low frequencies the diaphragm vibrates as a single unit. However, at the higher frequencies it is necessary to consider it to be made up of three sepa- 1 Jones, W. C, Jour. , Vol. 57, No. 10, p. 559, 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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