Ok class, today we will learn about sound compression. MP3s are all the rave today, CDs are going extinct due to the Apple iPod and other MP3 players an thus the start of the death of sound quality in music, but wait, there may be a way to get small files and great quality sound.

Creative Labs has come to the rescue. They can save sound quality so that it is not a thing of the past. We can spice up MP3s to CD quality or better with the new Xmod Module. The external candy-bar sized unit up-converts audio files from 16-bit to 24-bit and promises to enhance low and high frequencies giving “beyond the original CD quality” sound. Xmod doesn’t require any drivers and connects between the computer or MP3 player and speakers.

Now for a lesson; How does it work? Typical compression technology reduces file sizes by shrinking the dynamic range or the range between the highest and lowest notes.
This compression is usually done on a ratio basis, so every 3dB rise in audio is reduced to 1dB. Xmod claims to intelligently figure out where this compression started and expands the low and high notes back to their original studio recording quality. The unit even claims to convert regular stereo sound into surround sound, even when using only two speakers. Wow!

So how much? The Xmod is currently shipping for about $80. So that’s it for today, read Highbridnation pages 67 - 75 there will be a test tomorrow