7 Miscellaneous topics
Steven Dixon
Department of Physics, University of Warwick
Vivian Weeks
Formerly of BBC Design and Equipment Department
7.2 International standards for sound systems and equipment
John Ratcliff
Proprietor, The Television Training Company
7.5 Portable appliance testing
7.1 Ultrasonics
7.1.1 Introduction
‘Ultrasonics’ is the broad term which describes the study or application of sound waves with frequencies greater than can be detected by the human ear. This definition is somewhat arbitrary, but 16 kHz is usually considered to be the lower frequency limit of the ultrasound spectrum despite the fact that some human beings, particularly young children, are ...
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