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The design of distance-learning programmes and the role of content experts in their production

Jennifer M Laidlaw1, Ronald M Harden, Lorraine J Robertson

  • 1Centre for Medical Education, University of Dundee, Dundee, UK. j.m.laidlaw@dundee.ac.uk

Medical Teacher
|May 15, 2003
PubMed

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Study Design in Statistics

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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