Abstract
In the past, there has been a requirement for determination of both the sound power of sources and an investigation of the pure‐tone content. This is especially true in the computer and business equipment industry. Measurement of the sound power normally calls for standard (ANSI) class III 1/3 octave band filters, while pure‐tone determination requires narrow‐band (FFT) measurements; hence, two separate instrument systems were required. This paper describes a new instrument for these determinations in which the true standardized 1/3 oct filters and the FFT are combined. The procedure for automatically identifying prominent discrete tones per ANSI S12.10 is discussed.
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