An analysis system has been developed that uses a swept sine wave signal for the source/receive sound pressure level measurement of the noise reduction between two spaces according to ASTM E3359-23. By conducting one sweep in each of the two spaces, bi-directional sound transmission loss can be determined. The swept sine can also be used to determine reverberation times needed to normalize the noise reduction and/or calculate the sound transmission loss of a specimen, reducing the total time needed to perform the measurement. Advantages of the swept sine method will be discussed. The paper will present the results from comparison of the swept sine technique with traditional broadband noise/interrupted source methods for making these measurements, focusing on the laboratory standard ASTM E90-23 but also applicable to ASTM E336-24 used in the field.
Schmitt et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: