Abstract
In ISO/TC43/SC1/WG25, the precision method of sound power determination by sound intensity scanning method is being drafted as the third standard of ISO 9614 series. For this drafting work, some experimental studies were performed on the measurement accuracy, the methods for checking the measurement sound field (field indicators), and practical procedures of signal processing during the scanning. The sound power determination was made for artificial sound sources (a reference source and a sound source system consisted of two loudspeakers) and actual noise sources (a vacuum cleaner and an air compressor) by changing such measurement conditions as the scanning density, the scanning speed, and the strength of the extraneous noise. From the experimental results, the validities of the specifications in the draft are examined.
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