A few months ago one of our members posted a thread stating that he had written an ATRAC coder in software, and that all the information needed to implement it was readily available. Well I am a computer sci/eng student so I figured, why not. And I have spent several months learning the math I needed to deal with the theory involved with all of this. And I have succeeded in writting an ATRAC software implementation, with one caveat. He stated that he had problems with window size selection, I solved that problem (with ALOT of help from a very generous discrete signal theory professor at a distant university). But what I cannot solve is that the ATRAC spec calls for a QMF analysis/synthesis bank, in order for these to work properly, the analysis equation used must be the correct pair for the synthesis bank. No one has published (as far as I can find) the synthesis algorithm for ATRAC decoders. I was wondering if anyone knew the answer to this as it is the last step I need to finish my coder. Thanks For The Help, RJ Kirkland KC2COE USF Engineering ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]