Microphone Concentrators in Picture Production

Carl Dreher

By means of microphone concentrators high quality sound pickup is rendered possible at distances of the order of 20–40 feet. One such device utilizes a metal horn with the microphone placed at the throat. In another form, applied commercially by RKO Studios, sound is picked up by an ellipsoidal or parabolic reflector and focused on a microphone, with the sensitive face of the transmitter turned away from the action. The advantages of this type of concentrator are relatively high gain, ability to record against wind or noise interference, and suitable acoustic characteristics for high quality pickup at a distance. The importance of these factors in lowering moving picture production costs is described.

Print ISSN
Published
1931-01
Content type
Original Research
DOI
10.5594/J16624