. Elements of acoustical engineering. Electro-acoustics; Sound. the form of a labyrinth and enclosed in a case. The velocity and pressure sections are formed from a single con- tinuous ribbon. A common magnetic structure is used for both the velocity and pressure sections. Due to a finite length of pipe for the pressure section the velocity of the pressure ribbon leads the pressure in the sound wave at the low frequencies. See Sec. and Fig. The resis- tance (silk cloth) introduces a corre- sponding phase shift in the velocity section. At the high frequencies the phase shifts in the
. Elements of acoustical engineering. Electro-acoustics; Sound. the form of a labyrinth and enclosed in a case. The velocity and pressure sections are formed from a single con- tinuous ribbon. A common magnetic structure is used for both the velocity and pressure sections. Due to a finite length of pipe for the pressure section the velocity of the pressure ribbon leads the pressure in the sound wave at the low frequencies. See Sec. and Fig. The resis- tance (silk cloth) introduces a corre- sponding phase shift in the velocity section. At the high frequencies the phase shifts in the two elements are made the same by suitable geometrical configurations of the field structure. A unidirectional microphone consist- ing of a ribbon velocity element and CXJ CkJ Fig. Unidirectional microphone with the screen removed. Ribbon type pressure and velocity elements. a dynamic pressure element is shown in Fig. Equalizers are used to correct the amplitude and phase of the dynamic element to conform with the velocity element. A. The Response of the Unidirec- tional Microphone as a Function of the Distance and the Frequency". — The low frequency response of the velocity microphone is accentu- ated when the distance between the source and the microphone is less than a wavelength. The same effect occurs to a smaller extent in the unidirectional microphone. It VELOCITY ELEMENT PRESSURE ELEMENT EQUALIZER. FRONT VIEW CROSS SECTION A-A Fig. Unidirectional microphone consist- ing of a ribbon type velocity element and a dynamic type pressure element. "" 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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