Link: Odd Ball Sounds
_______________________________________________
Figure 43 : Computer analyzes a small section of the wave file, where there is no music and recognizes this as noise.
Digital noise reduction removes background noise, hiss, and hum by sampling a small section (figure 43) of the sound file, where there is no music, only background noise. It analysis the noise and then replaces it with quiet, inaudible tones throughout the entire sound file, after the entire sound file is highlighted.
Figure 44 : The noise reduction effect is applied to the highlighted section of the wave file.
Noise gates turn on during the music, and off in between the notes, letting the noise through during the music. Digital noise reduction is by far superior to the noise gate, because it removes the noise throughout the entire sound file. Unfortunately, these quiet, inaudible tones can be heard if used improperly. (See odd ball sounds page.)
Figure 45 : Control settings for Cool Edit 2000 noise reduction. Change the snapshots in profile & FFT size to maximum.