| 摘要 |
Acoustic intensity is measured by a pair of closely spaced microphones aligned in a given direction. One microphone is connected directly to an integrator the output of which is connected to a multiplier while the other microphone is connected directly to the multiplier. The multiplier output is proportional to the imaginary part of the cross-spectrum of the two microphone signals which when time averaged represents the absolute value of the sound intensity in the given direction if the microphone systems are properly phased matched.
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