. Elements of acoustical engineering. Electro-acoustics; Sound. UNIDIRECTIONAL 5 FEET C°20 >2 -100 FREQUENCY 1000 D 20. 100 FREQUENCY Fig. A. The relative voltage output of a velocity (or pressure gradient) microphone as compared to a nondirectional pressure microphone for distances of 1, 2 and 5 feet. B, C, D, the relative voltage output of a unidirectional microphone as compared to a nondirec- tional pressure microphone for distances of 1, 2 and 5 feet and for various angles of the incident sound. B. Efficiency of Energy Response to Random Sounds of the Unidirec- tional Microphone a
. Elements of acoustical engineering. Electro-acoustics; Sound. UNIDIRECTIONAL 5 FEET C°20 >2 -100 FREQUENCY 1000 D 20. 100 FREQUENCY Fig. A. The relative voltage output of a velocity (or pressure gradient) microphone as compared to a nondirectional pressure microphone for distances of 1, 2 and 5 feet. B, C, D, the relative voltage output of a unidirectional microphone as compared to a nondirec- tional pressure microphone for distances of 1, 2 and 5 feet and for various angles of the incident sound. B. Efficiency of Energy Response to Random Sounds of the Unidirec- tional Microphone as a Function of the Relative Sensitivities of the Bidirec- tional and Nondirectional Microphones'^^.— The unidirectional microphone consists of the combination of a bidirectional microphone, in which the output is a function of the cosine of the angle of incidence, and a non- directional microphone. In general, it is customary to make the output of the bidirectional microphone for 6 = 0 equal to the nondirectional microphone. For this condition the directional characteristic is a cardioid of revolution. In the case of both the bidirectional and the cardioid uni- 28 Olson, H. F., Broadcast News, No. 30, p. 3, May, 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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