Hypersonic effect

The term "hypersonic effect" has also been used to describe airflow in highly supersonic aerodynamics, in the study of hypersonic flight.[1][2]

The hypersonic effect is a phenomenon reported in a controversial scientific study by Tsutomu Oohashi et al.,[3] which claims that, although humans cannot consciously hear ultrasound (sounds at frequencies above approximately 20 kHz),[4][5][6][7] the presence or absence of those frequencies has a measurable effect on their physiological and psychological reactions.

Numerous other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, finding that people who have "good ears"[8] listening to Super Audio CDs and high resolution DVD-Audio recordings[9] on high fidelity systems capable of reproducing sounds up to 30 kHz[10] cannot tell the difference between high resolution audio and the normal CD sampling rate of 44.1 kHz.[8][11][12][13]

  1. ^ Journal of the aeronautical sciences, Volume 25, p. 187. Institute of the Aeronautical Sciences (U.S.), American Institute of Physics, 1958.
  2. ^ Smits, Alexander J. Turbulent shear layers in supersonic flow, p. 67. Birkhäuser, 2006. ISBN 0-387-26140-0
  3. ^ T. Oohashi, E. Nishina, M. Honda, Y. Yonekura, Y. Fuwamoto, N. Kawai, T. Maekawa, S. Nakamura, H. Fukuyama, and H. Shibasaki. Inaudible high-frequency sounds affect brain activity: Hypersonic effect. Journal of Neurophysiology, 83(6):3548–3558, 2000.
  4. ^ Ashihara, Kaoru (2007-09-01). "Hearing thresholds for pure tones above 16kHz". The Journal of the Acoustical Society of America. 122 (3): EL52–EL57. Bibcode:2007ASAJ..122L..52A. doi:10.1121/1.2761883. ISSN 0001-4966. PMID 17927307.
  5. ^ "Detection threshold for tones above 22 kHz". May 2001.
  6. ^ "Differences of Hearing Impressions Among Several High Sampling Digital Recording Formats". May 2005.
  7. ^ "Perceptual Discrimination between Musical Sounds with and without Very High Frequency Components". October 2003.
  8. ^ a b Lehrman, Paul D. (2008-04-01). "The Emperor's New Sampling Rate". Mix. Archived from the original on 2008-04-11.
  9. ^ Meyer, E. Brad; David R. Moran. September 2007. Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback: Sources, Venues, and Equipment. Boston Audio Society. Retrieved on October 14, 2009.
  10. ^ SLS Loudspeakers. S1266 Archived 2010-01-06 at the Wayback Machine. Retrieved on October 14, 2009.
  11. ^ Meyer, E. Brad; David R. Moran. September 2007. Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback. AES E-Library. Retrieved on October 13, 2009.
  12. ^ Cite error: The named reference Colloms2006 was invoked but never defined (see the help page).
  13. ^ Nishiguchi, Toshiyuki; Hamasaki, Kimio; Ono, Kazuho; Iwaki, Masakazu; Ando, Akio (2009-07-01). "Perceptual discrimination of very high frequency components in wide frequency range musical sound". Applied Acoustics. 70 (7): 921–934. doi:10.1016/j.apacoust.2009.01.002.