Pro-Logic

[kitty]

An encoding technology developed by Dolby Laboratories, Pro-Logic and Pro-Logic II are methods of encoding 4 channels for Pro-Logic (left, right, center, surround) and 5 channels for Pro-Logic II (left, right, center, left surround, right surround), into a stereo (left, right) channel format to be decoded into 4 or 5 channels with a proper decoder. It is actually just a small amount of inaudible data slipped into a stereo audio stream that can be reconized by a decoder so that the decoder can separate the stereo signal into 4 or 5 channels. A Pro-Logic signal can be encoded into any form of stereo audio stream including digital files such as mpeg-1/2 layer 2, MP3, uncompressed PCM, audio CD's, and it is also used to get multichannel in VHS tapes and other analog sources. You can listen to Pro-Logic encoded audio streams with any normal equitment but you will only have 2 channels. DVD players are required to have a capable Dolby Digital decoder to downmix a 5.1 Dolby Digital signal on DVDs to a Pro-Logic stereo signal to be output with analog RCA cables. Pro-Logic II can be decoded with Pro-Logic decoders but you will only get 4 channels instead of 5. Pro-Logic is also called Dolby Surround. Dolby

[2573]

here you can find how put the sound files in your stereo file so the pro logic decode can reconaice them ok:

http://www.ctv.es/USERS/avi/dolby.htm

it is in spanish, you can translate it by google.