Deletes silence from the selected part of an audio file.
dbThreshold
The threshold audio level (in db). It is negative value, for example "-40". It varies from -90 to 0.
AttackTime
The period of audio (in ms) below the given threshold before assuming the silence is started. It varies from 50 to 500.
ReleaseTime
The period of audio (in ms) above the given threshold after it is determined to be the end of the silence. It varies from 1 to 5000.
Remarks
N db = 20 lg (Pn/P0)
N - number of db.
Pn - Level of sound pressure in pascals.
P0 = 2*105 pascals.
If signal is below the Threshold for more than AttackTime, beginning of that spot in the audio will be considered beginning of silence.
If signal is above the Threshold for more than ReleaseTime, beginning of that spot in the audio will be considered end of silence.
Silence Definition
For very quiet high quality audio, the dbThreshold value will be lower (like -60dB). For noisier audio, the value may be much higher (like -30dB).
If audio is above this given threshold for more than the number of milliseconds given, audio will be considered valid, and not silence. Use higher values for ReleaseTime to ignore short periods of audio (like clicks, static, or other noise). If this value is too high however (above 200ms), short words may be skipped.
Use much less values for Attack Time than Release Time