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If you want to use audio that isn’t yet in digital form
(for example, from an analog cassette or a live microphone), you
need to digitize it through an audio or audio/video digitizer/capture
card.
The quality of digitized audio and the size of the audio file
depend on the sample rate (the number of samples per
second) and bit depth (the number of bits per sample)
of the digitized audio. Also, stereo audio requires twice as much
disk space as mono audio. These parameters, controlled in the Capture
section of the Project Settings dialog box, determine how precisely
the analog audio signal is represented in digital form. Higher sample
rates and bit depths reproduce sound at higher levels of quality,
but with correspondingly larger file sizes. Capture audio at the
highest quality settings your computer can handle, even if those settings
are higher than the settings you’ll specify for final export or
playback. This provides headroom, or extra data, that
helps preserve quality when you adjust audio gain or apply audio
effects such as equalization or dynamic range compression/expansion.
Although the DV format can record two independent stereo audio pairs,
Premiere Pro can capture only one stereo pair. It may be possible
to select either stereo pair 1, stereo pair 2, or a mix of both,
depending on the DV hardware you use. For details, see the documentation
for the DV hardware.
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