Difference between FFT and IMDCT ?

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dipakkochar

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Hi,
Can people tell me the advantages of IMDCT over FFT ? As we all know TDAC is one of the factors . Is there any other advantage ?

rgds,
Dipak
 

Thanks for the reply but what your reporting is similar to TDAC ..
 

The main reason of using DCT for compression is that it is asymptotically equivalent to the KLT for such large signal class like first order Gauss-Markov process with a large positive coefficient.

Filter bank implementation (for TDAC) is a second place of DCT application.

You can google by "asymptotically equivalent to the KLT"

You can see also
M. Vetterli and J. Kovacevi'c, Wavelets and Subband Coding, Prentice Hall,
Englewood Cliffs, NJ, 1995.

pp. 374-375 is short and clear explanation on this topic
 

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