The physical design of the response‐equalizing components of the acoustic transformer‐coupled photophone is presented. Two possible equalizers for the absorption cell—a gas column and a loaded diaphragm— are discussed; one equalizer for the earpiece, consisting of a diaphragm and screen, is also discussed. The optimization, equalization, and physical realization of a direct‐coupled photophone (one not containing an exponentially tapered tube acting as an acoustic transformer) is also presented. It is found that its response is poorer than the transformer‐coupled photophone by 25 dB.
Subject Classification: [43]85.86, [43]85.40, [43]85.60.
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© 1976 Acoustical Society of America.
1976
Acoustical Society of America
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