. Elements of acoustical engineering. Electro-acoustics; Sound. HIGHLY DIRECTIONAL MICROPHONES 217 where d is the path length of the delay introduced for the point furthest removed from the common junction. R. = sin — {I — I cos Q -\- d) A - (/ - / cos 0 + ^) The directional characteristic of the microphone of Fig. for various ratios of the length of the Hne to the wavelength, and for a delay path of MAGNET. 3 2 Fig. Line Microphone. Useful directivity on the line axis. This microphone differs from Fig. in that a delay is inserted in each small pipe. The amount of delay is
. Elements of acoustical engineering. Electro-acoustics; Sound. HIGHLY DIRECTIONAL MICROPHONES 217 where d is the path length of the delay introduced for the point furthest removed from the common junction. R. = sin — {I — I cos Q -\- d) A - (/ - / cos 0 + ^) The directional characteristic of the microphone of Fig. for various ratios of the length of the Hne to the wavelength, and for a delay path of MAGNET. 3 2 Fig. Line Microphone. Useful directivity on the line axis. This microphone differs from Fig. in that a delay is inserted in each small pipe. The amount of delay is pro- portional to the distance from the pipe opening to the pickup point nearest the common junction. LENGTH = A LENGTH = A LENGTH =2A LENGTH = 4A. 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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