Hi ,

I m using the ADSP-21364 EZ-KIT Lite , trying to implement an algorithm based on overlap-add through the block based talkthru example.

As part of the algorithm i m trying to implement an fft and an inverse fft . I use the rfft1024 command and some kind of problem occurs with the numbers in the output of the fft and all the block is filled with -1.#QNAN .

First of all what does -1.#QNAN mean

And what shoud the problem be and -1.#QNAN occurs all the time ?

I m attaching the blockProcess.c file of the code . The other files of the example remain the same exept of a hamming window generated in main and some necessary declarations

Thanks Vaios.

PS the algorithm of the overlap add method can have some mistakes as i cant implement the fft right in order to check it .

Hi,

I cannot help with your algorithm, however I can explain the #QNAN. QNAN is a 'Quiet Not-A-Number' value:

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

Regards,

Craig.