![]() To make a good compression algorithm for sound, a technique called perceptual noise shaping is used. So we're familiar with compression algorithms for images and words and we know they work. Is it possible to compress a song without hurting its quality? We use compression algorithms for images all the time. This lets you download a song much more quickly, and store hundreds of songs on your computer's hard disk. With MP3, a 32-megabyte song on a CD compresses down to about 3 MB. The goal of using MP3 is to compress a CD-quality song by a factor of 10 to 14 without noticeably affecting the CD-quality sound. The MP3 format is a compression system for music. ![]() Over a 56K dial-up modem, it would take close to two hours. Even with a high-speed cable or DSL modem, it can take several minutes to download just one song. ![]() If an average song is three minutes long, then the average song on a CD consumes about 32 million bytes (or 32 megabytes) of space. Let's break that down: 1.4 million bits per second equals 176,000 bytes per second. ![]()
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