1. Whats the diff between MPEG l, MPEG ll and MPEG ll.5?
it defines the how much channel there is. mpeg I is stereo. i guess the other two are multichannel.
2. What is VBR method?
vbr is magic. basicly you tell the compression to write less kilobites for quiet passage of the music and use more kilobites for complex passages. this way it is believe you can get higher sound quality at a specific kbs comparing to CBR compression (constand bit rate) and save more space at the sametime. you choose between two kbs you want the mp3 to varies its size within. the side effect of this is the song will somehow turned out to be a second or two longer than the original song. also it require more processing power than CBR, for computer it means nothing, but with portable devices it could mean a bit less battery life. i like ABR, which is also basicly vbr where the mp3 is concerntrated around one kbs.
3. What is Out. Samplerate?
basicly alow you resample the sampling rate, cd music is 44.1khz. some people like upsampling to higher number because it gives smoother higher or something like that. i rather leave this setting alone to keep it more true to original sound, but the paradox said the music is already compressed anyway. if the music is original recorded and remastered to a higher sampling rate then it will technically sound better than 44.1khz, but you cant upsampling to make it 'sound better', more like changing the soung. there is also 16bit/24bit/32bit. cd is 16bit.
4. Whats the diff between Stereo, Joint Stereo and Dual Channel? Which one provides the highest quality?
okay i dont know what dual channel is. i beleive that stereo give the highest quality. joint stereo is a tecnique where it will no write extra kbs for when the a cetrain sound left and right channel sound similar, and regard them as the same, therefor saving space. there was a discussion thread about this a few days ago.
