Abstract
The Knowles series of miniature microphones have been used in the Flight Systems Department of the Royal Aircraft Establishment, Farnborough, Great Britain, for some years for the investigation of noise and speech levels at the ear inside the ear muff. This paper describes the types of microphone that have been used and the power units developed to enable them to feed a variety of measuring and recording equipment. This equipment has many other uses where a miniature microphone is required and the sound pressure level does not exceed 140 dB re 20 μPa. The equipment described has logged thousands of flying hours in RAF aircraft.
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