Troubles with fft functions of filter.h and trans.h

Hi Andrea,

Please see my reply below:

Problem using filter.h:

- I can't use convolve function with complex_float type.

>> Unfortunately, we don't seem to have a function to convolve complex_float type of data.

- Can I write out_complex.re and out_complex.im to get the real and imaginary part of the output of the rfftN?

>> Yes, out_complex.re and out_complex.im will provide the real and imaginary part of the output.

Problem using trans.h:

- This header does not contain a convolve function.

-  Moreover, I read that rfftN and ifftN functions take the input data  reversing the bit. Does it mean I have to flip the input and/or the  output? This point makes me confused.

>> Are you referring to the file "fft.asm" under the pah "C:\Program Files\Analog Devices\VisualDSP 5.0\214xx\lib\src\libdsp_src" ? I think idoes the bit reversing in the begining as it implements decimation in time FFT algorithm. But, it may be transparent to the application.

Hope this helps.

Thanks,

Mitesh

Thanks Mitesh.

I guess I'm going to use the functions of trans.h in one file and then convolve function from filter.h in another file.

It seems strange to me. I can't use both header in the same file AND I can't use time and frequency domain functions (in series) from filter.h because they work with different type of data.

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EZ Admin