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Abstract

Ultrasound consists of waves of frequency above 18,000 Hz and hence outside the audible range. Sound is audible in the frequency range 16 to 18,000 Hz; below 16 Hz one speaks of infrasound or subsonic vibrations.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1975

Authors and Affiliations

  • Hossein Schams
    • 1
  • Jürg Bretscher
    • 1
  1. 1.Maternité Inselhof TriemliKlinik für Geburtsmedizin und GynäkologieZurichSwitzerland

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