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The world beyond 20kHz - Townshend Audio www townshendaudio com/PDF/The-world-beyond-20kHz pdf input from frequency components above 20kHz I have read many irate letters from such engineers insisting that information above 20kHz is clearly useless,
Damage to human hearing by airborne sound of very high frequency www hse gov uk/research/crr_ pdf /2001/crr01343 pdf For ultrasonic components above 20 kHz, the limits were set to avoid hearing damage in the audible (lower) frequencies One-third-octave band levels of
Effects of very high-frequency sound and ultrasound on humans Part II resource isvr soton ac uk/staff/pubs/PubPDFs/2018_Fletcher_et_al_(JASA)_Effects_of_VHF+US_on_humans_Part2_Inaudible_Ultrasound pdf Hearing thresholds for the 20kHz tone were measured before and after the experiment, and in both cases were >105dB SPL (at least 10dB above the SPL of the
Ultrasonic animal repellers - FPS Public Health www health belgium be/sites/default/files/uploads/fields/fpshealth_theme_file/19104810/Abstract 20study 20KUL 20unltrasonic 20 pdf higher than 20 kHz/kilohertz), which should, in principle, be inaudible to humans, but also use high- frequency audible sound waves (with frequencies lower
Hearing in the elephant (Elephas maximus) - The University of Toledo www utoledo edu/al/psychology/ pdf s/comphearaudio/Hearing_in_the_Elephant_Elephas_maximus_SC1980 pdf ty to hear above 20 kHz (1, 4) However, it would now appear that humans may not be unusual in this respect, but may even have better high-frequency hearing
What Can Birds Hear? - eScholarship escholarship org/content/qt1kp2r437/qt1kp2r437_noSplash_8040d7507ac55f6c4c7582772f335f47 t=ptavtz birds using sound, auditory alerts must be at frequencies that can be detected by the damaged sensitivity to frequencies above · 20 kHz (ultrasound)
frequency components above 20kHz I have read information above 20kHz is clearly useless, and any attempts to include such information in audio signals is
acoustic waves with frequencies higher than the upper au- dible limit of human hearing This limit varies (10–20 kHz) from person to person and is approx