Apple Soundtrack Pro - Manual (Page 178)

178 Chapter 7 Working in the Waveform Editor
Types of Audio Analysis
The following types of analysis can be performed in the Waveform Editor:
Clicks and Pops
Sudden, short peaks in the audio file can result from a variety of causes, including
mechanical defects in analog recordings. You can set the threshold above which
Soundtrack Pro considers peaks to be clicks or pops.
(Power Line) Hum
Power lines and other electrical equipment can produce a steady hum, often at 50 or
60 Hz. The hum can also include low-order harmonics of the fundamental frequency.
DC Offset
DC offset is a shift in the audio, causing the positive and negative parts of the signal
not to average to zero. DC offset can limit the dynamic range of an audio file.
Phase Issues
Phase issues can result from a distorted or inaccurate stereo image, caused by poor
microphone placement or other issues. When converting a stereo file to mono, the
presence of phase issues can cause the left and right channels to cancel each other out
partially or completely.
Clipped Signal
A clipped or overloaded signal can result from several causes, including poor gain
staging in a preamp during recording, bad electrical cables, or surface damage to an
analog recording.
Silence
Silence detects parts of the audio file at which the audio signal falls to zero (0). You can
set the threshold below which Soundtrack Pro considers the signal to be silence.
To select the types of analysis to perform:
1 In the Analysis Type list, select the checkboxes next to the types of analysis you want to
perform on the audio file.
2 To analyze the file, click Analyze.