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Chapter 3
Working with Individual Audio Files
53
Editing a File’s Samples
While most edits don’t require moving samples individually, some sound editors prefer
to work at the sample level. You can easily edit the individual samples of an audio file,
changing the amplitude of one or several samples.
What Is a Sample?
A
sample
is the smallest measure of digital audio. To understand how small a sample is,
consider this: one second of audio requires thousands of samples. Commonly used
sample rates include 44.1 kHz for CD-quality audio and 48 kHz for digital video–quality
audio files.
Samples are produced by analog-to-digital converters that measure (sample)
continuously changing analog audio strength and that output discrete numbers at
regular intervals of time.
In Soundtrack Pro, you define your sample rate, the size of the digital samples used in
your project, when you configure your project settings.
Each solid dot in
the waveform at
the left represents
a digital sample.