Abstract
In the measurement of sound-transmission loss and sound-absorption coefficients it is necessary to randomize the sound field to the greatest extent possible so as to validate the reverberant sound field statistics upon which such measurements are based. One difficulty that is often experienced is the lack of excitation of a sufficient number of normal modes of the test rooms. For this reason a new type of warble oscillator that generates a continuous band of frequencies, in which the band width and band center are capable of continuous variation, has been investigated. In addition, some experiments will be described in which averaging of sound levels is accomplished by the use of a large number of microphones, as many as 18, in series-parallel combinations.
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