writting paper based following link

http://en.wikipedia.org/wiki/Fourier_transform

 

http://en.wikipedia.org/wiki/Time%E2%80%93frequency_analysis

 

based on the above material, 

write about the principle of the time frequency analysis and the history of time frequency analysis and the usage of the time frequency analysis in the industry and the world, this paper should write in depth.

 

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