A portable tool was developed for accurate field measurements of reverberation time and frequency characteristics of a given enclosure. This tool, including a CRT and a tone-burst generator, is called AS-1. It displays computed results, such as the ensemble average reverberation curves associated with calculated RT(60), D(50) and EDT(10). Use of a microprocessor and its peripherals permits the on-line and real-time measurement of these parameters, ordinarily obtained on a large off-line computer. The functions and system architecture of the AS-1 are described, showing data obtained in actual measurements and the digital signal-processing technology used. Because of its averaging and noise suppression capability, the AS-1 is also applicable to absorption coefficient measurements in a reverberation room and to tests of audio equipment, requiring only a loudspeaker and a microphone, and no other equipment such as a sweep generator and level recorder.
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