user manual

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PROCESSING AUDIO CHP. 10
DC Offset
Audio that is not centered around the zero baseline in the waveform display is said to have a DC offset. DC
offsets are typically caused by electrical conflicts between the sound card and input device. The
DC Offset
function is used to change the baseline of an audio file by adding a constant value to each sample to
compensate for offsets.
Estimating DC Offset
You can estimate the DC offset of an audio file by choosing Statistics from the Tools menu.
DC Offset controls
The following controls are located in the DC Offset dialog.
Automatically detect and remove
Calculates and corrects the DC offset for each channel individually.
Adjust DC offset by
Allows you to specify a DC offset value manually.
• -2,147,483,648 to 2,147,483,647 for 32-bit data
• -8,388,608 to 8,388,607 for 24-bit data
• -32,768 to 32,767 for 16-bit data
• -128 to 127 for 8-bit data
Compute DC offset from first 5 seconds only
Selecting the Compute DC offset from first 5 seconds only check box specifies that only the first five seconds of
a file are analyzed when measuring the DC offset. Be aware that five seconds is not sufficient if the beginning
of a file has a long fade-in or mute.
DC Offset dialog
Average DC offset