Abstract
The measurement of machinery noise, sound-transmission loss, and reverberation decay inside reverberant enclosures requires multiple measurements obtained from several positions in the test enclosure. These measurements are used to establish a space average sound pressure. The paper describes a multichannel microphone system that sequentially samples six microphones to provide a single microphone signal. This composite signal is then analyzed. No further space-averaging computation is required. The averaging time of the recorder is discussed with reference to swinging microphone arrangements and microphone multiplexing systems.
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