Audio Bit Depth and Channels
Audio bit depth refers to the number of bits used to describe each audio sample. Bit depth affects the range of sound that the audio file can reproduce, from silence to the loudest sound. This range is known as the signal-to-noise ratio (s/n), which can be measured in decibels (dB).
Premiere and many other programs express this range as bit depth and allow you to choose the one that is most appropriate for your needs (Figure 18.31).
Figure 18.31. Specify an audio bit depth and channel options from the Format pull-down menu in the Audio panel of the Capture, Project, and Export Movie Settings dialog boxes.
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