hi every one, i'm a newbie here... can some one help me how to have a look at the filter bank process on lame... ? by extracting the result, i wish to plot the result to get more understanding on the mp3 encoding process

If you want a technical description of it's Polyphase Quadrature Mirror Filterbank that is divided in 32 subbands. It uses the Gpsycho model.

We have some basic info in the Wiki.

thanks everyone, but how can i get all the values on LAME program and Plot the value in fre time graph ?

I guess dig through the source code and add a printf somewhere.