September 2012
Intermediate to advanced
736 pages
26h 18m
English
Content preview from Loudspeaker and Headphone Handbook, 3rd Edition
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2 |
Transducer drive mechanisms |
John Watkinson |
2.1 A short history
This is not a history book, and this brief section serves only to create a context. Transducer history basically began with Alexander Graham Bell's patent of 18761. Bell had been involved in trying to teach the deaf to speak and wanted a way of displaying speech graphically to help with that. He needed a transducer for the purpose and ended up inventing the telephone.
The traditional telephone receiver is shown in Fig. 2.1(a). The input signal is applied to a solenoid to produce a magnetic field which is an analog of the audio waveform. The field attracts a thin soft iron diaphragm. Ordinarily the attractive force would be a rectified version of the input as in Fig. ...
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