. Elements of acoustical engineering. Electro-acoustics; Sound. DISPERSION OF SOUND 289 siderable amplification which increases the tendency for feedback. In cases where difficulties are experienced, due to acoustic feedback, a further reduction in coupling can be obtained by employing directional microphones. Furthermore, the stage collecting system should not be responsive to sound originating in the orchestra or audience. In case the micro- phones are located in the footlights, the shielding effects of the apron, to- gether with a velocity microphone. Fig. , are in general sufficient to
. Elements of acoustical engineering. Electro-acoustics; Sound. DISPERSION OF SOUND 289 siderable amplification which increases the tendency for feedback. In cases where difficulties are experienced, due to acoustic feedback, a further reduction in coupling can be obtained by employing directional microphones. Furthermore, the stage collecting system should not be responsive to sound originating in the orchestra or audience. In case the micro- phones are located in the footlights, the shielding effects of the apron, to- gether with a velocity microphone. Fig. , are in general sufficient to accomplish this objective. Where it is impossible to shield the micro- phones in this manner the unidirectional microphone has been found to be very useful, as will be seen from a consideration of the directional charac- teristics of this microphone shown in Fig. ,PLANE OF VZERO RESPONSE DIRECTIONAL CHARACTERISTIC MICROPHONE. 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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