Reply by Matthias Alles●January 22, 20042004-01-22
Steven G. Johnson wrote:
> See the FFTPACK source code (or FFTW) for an example of how you can
> compute an IDCT (a.k.a. a type-III DCT) via pre/post-processing of a
> real-input FFT. (If you have a complex FFT algorithm, of course there
> are standard tricks to use it for a real-data transform of twice the
> length.)
Thanks for the tip!
Reply by Steven G. Johnson●January 22, 20042004-01-22
Matthias Alles wrote:
> I just implemented an IFFT on a DSP and now I�d like to know, what has
> to be done, so that I can use that IFFT as an IDCT.
See the FFTPACK source code (or FFTW) for an example of how you can
compute an IDCT (a.k.a. a type-III DCT) via pre/post-processing of a
real-input FFT. (If you have a complex FFT algorithm, of course there
are standard tricks to use it for a real-data transform of twice the
length.)
Reply by Matthias Alles●January 21, 20042004-01-21
Hi!
I just implemented an IFFT on a DSP and now I=B4d like to know, what has =
to be done, so that I can use that IFFT as an IDCT.
Thanks,
Matthias