Abstract
This paper introduces a method for measuring the transmission loss and phase distortion that an acoustic signal undergoes in passing through plates. The physical setup consisted of two hydrophones on either side of a 14-in. steel plate and an underwater speaker at a “quiet” test facility. Their “white-noise” signals were recorded simultaneously on an FM tape recorder. The tape recordings, filtered from 100 to 9000 Hz to avoid aliasing, were digitized at 18 000 samples/sec, introduced into a UNIVAC 1107 computer, and the cross-correlation functions obtained. The cross correlation between the speaker and hydrophone separates the signal coming along various paths according to their time of arrival. The section of the correlogram containing the incident signal is considered, while all other values are set to zero; then the power and phase associated with this section are determined. The section containing the transmitted signal is given similar consideration. The incident power minus the transmitted power gives the transmission loss. Mathematical description of the transmission loss is found to be in good agreement with these experimental results.
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