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A coupled waveguide model is developed that represents sound transmission in a flowing fluid which contains a windscreened microphone probe.
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General transform relations are established between the sound pressure auto- and cross-spectral densities measured by using a two-microphone probe and the corresponding sound pressure data for the forward- and the backward-travelling wave components.
The microphones probe their way into the circle, the cameras searching out action.
Materials and Methods: Microphone-probe measurements were made in the external ear, together with multifrequency timpanometry distortion product transient otoacoustic emissions in 19 right and 20 left ears from male individuals and 23 right and 23 left ears from female individuals with 17 to 30 years of age.
Snakelike robots could one day be slithering around waste disposal sites to check for leaking drums, or inching through building wreckage with a camera and microphone to probe for survivors.
Test results show that the calibrator can calibrate each probe microphone within ±0.5 dB up to 2 kHz, and within ±1 dB up to 4.9 Hz with a confidence level of 95%.
The calibration process simultaneously subject each microphone on the probe to the same known acoustic pressure using four equal-length, small-diameter tubes connected to a single excitation source.
The microphone and temperature probe were positioned at the center of a polycarbonate mouse cage complete with bedding, food container, etc, but no animal.
The system used two identical sound sources connected separately to an ER-10B+ probe microphone (Etymōtic Research, Elk Grove Village, IL).
Sound was played at 70dBSPL and 90dBSPL, calibrated using a probe microphone (Model ER-7C, Etymotic, Inc, Elk Grove Village, IL).
The stimuli were generated digitally and were compensated for the acoustic transfer function measured with a probe microphone near the eardrum.
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