7    Miscellaneous topics

Steven Dixon

Department of Physics, University of Warwick

7.1  Ultrasonics

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

7.3  Digital time signals

7.4  Health and Safety

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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