Simultanious Masking

By adjusting the sampling rate to 22kHz and the number of bits to 8, you can get the bit rate down to about 1/4 the original rate. However, the music does sound a little different. The next demos show how mp3 compression can get the bit rate down to less than 1/10 the original rate and the music sounds just as good as before compression.

Many sounds are present that you can't hear.

• They are too quiet, or
• There are other louder sounds
  • close in frequency or
  • just before or after in time
• If you can't hear these sounds, don't save them in the file

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