signal compression whit FFT

[sigma10]

this is what I want to do:

" In the compression algorithm, each segment of 2048 samples is transformed using thefast Fourier transform. The coefficients are then thresholded, that is to say set to zerocoefficients below the threshold chosen.

The Fourier coefficients of high frequency are rejected, and are the coefficients of low frequencies that are used for reconstruction. "

[altenbach]

As I already said, make a small table that contains the location, magntude and phase of the non-zero components and save to file. Then make a mirror operation that reconstructs the signal from this data later. All the tools are already there.

[johnsold]

What you are describing is filtering, not compression.  Some data compression could be involved but the description does not indicate that it is.

What are you doing with the data after reconstruction?  What is the goal or purpose of the "compression?"

Do you understand the theory of sampled data systems and Fourier transforms?

Lynn

[sigma10]

So how can I do to compress a signal?

[tinnitus]

hello,

here an example of how to do a compression

but play the game , what is the goal of this  application ?

is it an home work ?

Regards

Tinnitus

[johnsold]

sigma10,

tinnitus showed how amplitude or reduced dynamic range compression works, the result at least.  Is that what you want?

Or, do you want to reduce the storage space as MP3 uses less space than a CD with the same musical performance?

Lynn

[sigma10]

yes exactly I want to reduce storage space.

[sigma10]

tinnitus:  I made three  reduction program images in MATLAB but I am still beginner inLabview is why I ask for help from you. and thank you very much anyway.

 and thank you to johnsold & Altenbach

[tinnitus]

Hello,

I see,

Ok you want to reduce space storage , but you don't expalin the methodyou want to use or it not appears so clear

 may be mp3 algo could be ok , just adapt your txt in a wav format and use a mp3 encoder ...

regards

Tinnitus

[sigma10]

hello

That's what I found in the literature but it is in french?