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FREQUENCY DISCRIMINATION OF INFRASOUND
FIELD STUDY OF INFRASOUND DETECTION
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90 dB SPL Abstract Acoust altitude Amer amplitude shift animals Astron attenuation auditory aurora Balachandran balance disorders Bedard bird's birds cardiac conditioning cochleae columellae Cornell dB over threshold dB SPL Figure decibel detect infrasounds Donn doppler shift earthquake experiments explosions frequency discrimination Frequency shift threshold Geophys hearing thresholds heart rate HERTZ higher frequencies homing pigeons human Hz at amplitudes infra infrasonic components infrasonic frequencies infrasonic waves INFRASOUND DETECTION infrasound microphone infrasound produced infrasound sensitivity infrasound sources infrasounds outdoors intense infrasound jet stream Kaschak l0 Hz l5 Hz l6 Hz Leventhall low frequency sound measured meters Microbaroms middle ear motion natural infrasound navigation noise nystagmus observed Pigeon audiogram Pigeons detect pipe pressure changes produce infrasound pseudosounds range recorded reported rocket sensory sound level meters sound propagation sources of infrasound speaker stimulus strain gauge test chamber Threshold curve tone vibrations Washington D.C. wavelength yes yes