Apple Soundtrack Pro User Manual download pdf (Page 206)

206 Chapter 9 Working With Audio Effects

Miscellaneous Effects

Miscellaneous effects don’t fall into any of the other categories. They include denoising

effects, pitch shifting effects, stereo enhancers, bass enhancers, and effects used to

transform the sound of vocals. Each effect gives you a different way to modify the

audio, and includes a unique set of parameters.

Denoiser

Using the Denoiser, you can eliminate or reduce many kinds of low-level noise (noise

floor) from an audio signal. The main parameters of the Denoiser are Threshold, Reduce,

and Noise Type. The Threshold parameter sets how high the noise floor is for the audio

signal. The recommended method for setting the Threshold is to find a passage where

you hear only noise, then set the Threshold so that signals at this volume level are

filtered out.

The Reduce parameter sets the level to which amount the noise floor is reduced. You

use the Noise Type parameter to set the type of noise that the Denoiser reduces. There

are three choices of noise type:

Â Setting the Noise Type to 0 (zero) causes the Denoiser to reduce “white noise” (all

frequencies reduced equally).

Â Setting the Noise Type to a positive value causes the Denoiser to reduce “pink noise”

(harmonic noise; greater bass response).

Â Setting the Noise Type to a negative value causes the Denoiser to reduce “blue noise”

(hiss, sibilants, tape noise).

The Denoiser recognizes frequency bands with a lower volume and less complex

harmonic structure, and then reduces them to the desired dB value. This method is not

completely precise, and neighboring frequencies are also reduced. Using the Denoiser

at too-high settings can produce the “glass-noise” effect, which is usually less desirable

than the existing noise.

There are three smoothing parameters that you can use to minimize the “glass-noise”

effect: Frequency smoothing, Time smoothing, and Level smoothing. Raising the

Frequency smoothing slider results in a smoother transition of denoising to the

neighboring frequencies. When the Denoiser recognizes that only noise is present in a

certain frequency band, the higher the Frequency Smoothing parameter is set, the

more it will also change the neighboring frequency bands to avoid glass noise.

By adjusting the Time smoothing slider, you can set the amount of time the Denoiser

takes to reach maximum noise reduction. By adjusting the Level smoothing slider, you

can set a factor for a smoother transition between adjacent volume levels. When the

Denoiser recognizes that only noise is present in a certain volume range, the higher the

Transition smoothing parameter is set, the more it will also change similar level values

to avoid glass noise.

1 2 ... 201 202 203 204 205 206 207 208 209 210 211 ... 310 311

No comments

Apple Soundtrack Pro User Manual Page 206