Converting The Sample Type - Adobe AUDITION 1.5 User Manual

CHAPTER 4
110
Editing Audio
3 Do one of the following:
To create a constant tone, select Lock To These Settings Only. Then, set options as
•
desired, and click OK.
To create a tone that changes dynamically over time, deselect Lock To These Settings
•
Only. Use the Initial Settings tab to set options for the initial tone, and use the Final
Settings tab to set options for the final tone. After you set options, click OK. The tone
generated will gradually go from the initial state to the final state.

Converting the sample type

A file's sample type determines its sample rate and bit depth, as well as the channel format
(whether the waveform is mono or stereo). You can convert the sample type to change any
of these attributes.
When you convert the sample type of a file, Adobe Audition directly processes the samples
within the file, or resamples the data, so that the audio retains the same pitch and duration
as the original file.
About sample rates
During the sampling process, an incoming analog signal is sampled at discrete time
intervals. Each interval of analog signal is momentarily observed, and thus, each repre-
sents a specific, measurable voltage level. A mathematical conversion generates a digital
series of numbers that represent the signal level at that particular point in time. The
generated data can be digitally stored or processed.
The sample rate is the number of samples (or snapshots) that are taken of an audio signal
per second. For example, a sample rate of 44,100 Hz means that 44,100 samples are taken
per second. Since sampling is tied directly to the component of time, a system's sample rate
determines a system's overall bandwidth—in other words, how many frequencies can be
encoded within the audio signal. Higher sample rates generally yield a better quality
waveform.
For more information, search for "Generate Tones options" in Help.