,I am currently trying to find documentation on the techniques and algorithms used in MP3 for my research (which is focused on MP3 and CELP, making some comparison between the algorithms and techniques that they used and how they behave given variety of audio input including music and speech). I have managed to find some in the www.mp3-tech.org but would like to find more. As you can guess from all my previous posts, I am a beginner in this area
(thank you for all of your responses to my previous posts, my research would not advance without your help ), and hence I am currently still trying my best to understand the technology. Based on what I have read, this is what I currently have in mind for MP3:
MP3 uses psychoacoustic model (but it does not use Linear Predictive coding used in CELP) - (If I am not mistaken, one of the document said that new advances such as the "Twin VQ" combine both psychoacoustic model and LPC. So would I be right to say that MP3 as an "older technology" only use the psychoacoustic model?)
I am also not sure on whether MP3 use vector or scalar quantisation - the documents that I have read mention that most audio coding techniques utilise vector quantisation (and I know that CELP speech coding technique use it) but iyt does not say whether or not MP3 use VQ as well. I have also found that the papers that I find give only brief explanations on Huffman coding and MDCT - I am currently reading a paper by Painter & Spanias on Perceptual Audio coding, which gives me more insight on it but I am not too sure if it applies to the MP3 technology
. So if anyone have the answers to my questions or if anyone can refer me to a good reading material, would you please advise me on these matters? . Thank you very much for your time and advises.