Waves Plug-in for Vocals and Monophonic Especificaciones descargar pdf (Pagina 353)

100

101

Chapter 69: DINR 337

The Noise Signature

The jagged line is a graph of noise. This is called

a noise signature. It is created when you use the

Learn button in the Broadband Noise Reduction

window. Once you have the noise signature of an

audio file, you will be able to begin removing the

noise by generating and editing a threshold or

Contour Line (covered next) between the noise

and the desired audio signal.

The Contour Line

The line with a series of square breakpoints is

called the noise contour line. The Contour Line is

an editable envelope which represents the divi-

sion between the noise and the non-noise signal

in the current audio file. The Contour Line is

created by clicking the Fit or AutoFit button in

the Broadband Noise Reduction window after

you have learned a section of noise. By moving

this envelope up or down, or by moving the in-

dividual breakpoints, you can modify which sig-

nals are removed and which remain.

The noise modeling process treats audio below

the line as mostly noise, and audio above the

line as mostly signal. Therefore, the higher you

move the Contour Line upwards, the more audio

is removed. To maximize noise reduction and

minimize signal loss, the Contour Line should

be above any noise components, but below any

signal components.

To fine-tune the broadband noise reduction,

move breakpoints at different locations along

this line to find out which segments remove the

noise most efficiently. Editing the Contour Line

to follow the noise signature as closely as possi-

ble will also help maximize noise reduction and

minimize signal loss. See “Editing the Contour

Line” on page 343.

Broadband Noise Reduction

Controls

BNR provides audio processing controls, con-

trols Contour Line controls, and controls for

navigating the Spectral Graph.

BNR Audio Processing Controls

Noise Reduction Amount

This slider controls how much the noise signal is

reduced. It is calibrated in decibels. A setting of

0 dB specifies no noise reduction. Increasing

negative amounts specify more noise reduction.

The default value is 0 dB.

In many cases, as much as 20–30 dB of noise re-

duction can be used to good effect. However, be-

cause higher amounts of noise reduction can

generate unwanted audio artifacts, you may

want to avoid setting the NR Amount slider to

its maximum value.

Spectral Graph showing the noise signature

Spectral Graph showing the Contour Line

NR Amount, Response, Release, and Smoothing

1 2 ... 348 349 350 351 352 353 354 355 356 357 358 ... 651 652

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