search for: psychoacust

Hi Any help is appreciate! These days I studied ogg vorbis encoder with sample rate 44.1kbsp,and I thought the whole chart was as follows: 1. read the PCM data and store them in a buffer 2. do MDCT on those PCM data 3. do FFT on those PCM data 4. use both the FFT and MDCT coefficient to the psychoacustic modle and derive an maximum allowable noise curve, and during this curse ,do the window anlysis and decide which window to use for the next coming PCM data 5. use the psychoacustic result on the MDCT coefficient and remove those below the maximum allowable noise curve 6. do floor anlysis...

...can not use [0,16,32,48,64,80,96,112,128] and encoder the diffence between the Y and the previous Y directly? Second, from the previos letter,I know that floor is the least squared error approximation of the maximum amount of noise allowable for each mdct coefficient/frequency (determined by the psychoacustic model). Now I am just confused whatever the floor really is .Is it a predition to the MDCT coefficient or just an estimation to the maximum allowable noise? And how the psychoaustic result is applied to the compution of the floor? Looking forward to your letter! ????????Lisa ????????fang...

Hi, Can any one explain me basic concept of Floor Generation in Vorbis encoder? Ravi __________________________________________________________ Yahoo! India Matrimony: Find your partner online. Go to http://yahoo.shaadi.com

Dear All: I studied the stereo couple documents and now confused, I wonder why it can be done like that, and what is the principle behind that. I think i am confused perhaps because i have no background knowledge, can you help me out? Also, when doing the T/F transform,we used MDCT, so it means no imaginary part. And i am much puzzled about the angle in the stereo couple,what does it mean?