. Elements of acoustical engineering. Electro-acoustics; Sound. .2 ! Fig. The directional characteristic of the velocity microphone shown in Fig. The polar graph depicts the output, in volts, as a function of the angle, in degrees. The maxi- mum response is arbitrarily chosen as unity. in the case of the pressure gradient microphone, it can be shown that the output of a baffle type velocity microphone corresponds to the particle velocity in a spherical wave. The response of a baffle type velocity micro- phone as a function of the distance from a point source and the frequency is
. Elements of acoustical engineering. Electro-acoustics; Sound. .2 ! Fig. The directional characteristic of the velocity microphone shown in Fig. The polar graph depicts the output, in volts, as a function of the angle, in degrees. The maxi- mum response is arbitrarily chosen as unity. in the case of the pressure gradient microphone, it can be shown that the output of a baffle type velocity microphone corresponds to the particle velocity in a spherical wave. The response of a baffle type velocity micro- phone as a function of the distance from a point source and the frequency is shown in Fig. 9.'16A. Unidirectional Microphones ^^-^^—The unidirectional micro- phone consists of the combination of a bidirectional microphone and a nondirectional microphone. The performance of this system is a function of the distance from the source, the spacing of the units, the sensitivity of the units and the phase angle between the units. These fundamental characteristics will now be considered. A unidirectional microphone consisting of a ribbon velocity element and a ribbon pressure element (see Sec. and Fig. ) is shown in Fig. The damped pipe terminating the back of the pressure ribbon is folded in 24 Olson, H. F., Jour. Acous. Soc. Amer., Vol. 3, No. 3, p. 315, 1932. -^ Weinberger, Olson and Massa, 'Jour. Acous. Soc. Amer., Vol. 5, No. 2, p. 139, 1933. 26 Olson, H. F., Jour. Soc. Mot. Pic. Eng., Vol. 27, No. 3, p. 284, 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.
Size: 1585px × 1576px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
