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AN3340 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3340
Description  Loudspeaker characterization and compensation
PDF  24 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3340 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3340
2/24
Doc ID 18453 Rev 1
Contents
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1
What is a loud speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2
Why compensate a loud speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3
How to compensate a loud speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Mechanical structure of a loud speaker . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical model of a loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5
Frequency response of a loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Loudspeaker compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1
General procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2
Speaker Tune tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2.1
Speaker Tune tool in practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2.2
An example and verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Appendix A
APWorkbench information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A.1
Frequency response data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A.2
On-line presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23



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