Unformatted text preview: digits. A low intensity laser is pointed at the disc. The laser light reflects strongly if the surface is smooth and reflects poorly if the surface is pitted. A receptor analyzes the reflection and produces the appropriate string of binary data, which represents the numeric voltage values that were stored when the signal was digitized. The signal is reproduced and sent to the speaker. This process is shown in Figure 3.9. Audio Formats Over the past few years there have been several popular formats for audio information, including WAV, AU, AIFF, VQF, and MP3. All of these are based on the storage of voltage values sampled from analog signals, but all format the details of the information in different ways and all use various compression techniques to one extent or another....
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- Fall '10
- Gramophone record, Compact Disc, human ear, VOLTAGE VALUES