DigiDesign Focusrite d3 Spécifications télécharger pdf (Page 75)

Chapter 8: DINR 69

4 Click the Fit button to ﬁt a Contour Line to it.

5 In BNR’s Spectral Graph, Command-drag

(Macintosh) or Control-drag (Windows) to

make a selection. Select points where the high-

frequency noise components are most evident.

In general, the ﬂatter areas of the Spectral

Graph, are better, since they represent quieter

areas where there is probably less signal and

more noise.

6 Click the Auto Fit button. DINR computes a

generic noise curve and corresponding Contour

Line based on your selection. If you want to re-

move the selection in the Spectral Graph Dis-

play, Command-click (Macintosh) or Control-

click (Windows) once.

7 Follow the steps given in the previous section

removing the noise using the NR Amount slider

and other controls.

8 Since the Contour Line is not based entirely

on noise from your audio ﬁle, you may also

want to edit its envelope in order to ﬁne-tune

the noise reduction. See “Editing the Contour

Line” on page 69.

Editing the Contour Line

One of the most effective ways to fine-tune the

effects of broadband noise reduction is to edit

the Contour Line. The Contour Line treats au-

dio below the line as mostly noise, and audio

above the line as mostly signal. Therefore, the

higher your move the Contour Line upwards,

the more audio is removed.

To maximize noise reduction and minimize sig-

nal loss, the Contour Line should be above any

noise components, but below any signal com-

ponents. To fine-tune the broadband noise re-

duction, try moving individual breakpoints at

different locations along this line to find out

which segments remove the noise most effi-

ciently. For more dramatic results, try moving

the entire Contour Line upwards. One drawback

of the latter technique is that it will typically re-

move a considerable amount of signal along

with the noise.

Remember that high frequency noise compo-

nents are typically more evident in the flatter,

lower amplitude areas of the Spectral Graph. Try

editing the Contour Line in these areas first.

To hear the changes you make to the Contour Line

in real time:

1 Select the target audio in Pro Tools’ Edit win-

dow. Make sure the selection is at least a second

or two in length. If the selection is too short,

you won’t be able to loop playback.

2 Select Options > Loop Playback.

3 Begin playback.

Noise components on the Spectral Graph

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 140 141

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