Autodesk 64006-051108-9001 User Guide - Page 91

The Audio Tab 83 Custom Notch Settings The Custom option enables you to specify the center of the frequency notch you are removing and the total width of the frequencies removed. Ideally, use as narrow a width as possible, so that the Notch filter does not remove other parts of the audio. The Custom setting also enables you to specify how many overtones are removed. Overtones are frequencies that are multiples of the base frequency. For example, AC power line noise is 60 Hz in the US; in practice, its overtones (120 Hz, etc.) are significant, as well. Choosing two overtones when removing a 60 Hz hum may be more effective than simply removing the base frequency. Experiment to determine the best settings when using the Notch filter. Start with no overtones and a low-width setting while targeting the main noise frequency. After you find the frequency of the main noise, expand the width until you eliminate the noise. If higher-pitched noise is audible, try adding overtones to eliminate it. Reverb The Reverb filter produces the effect of sound reverberating through a room. This can make the audio sound as if it were recorded in a large room or auditorium. Many producers add slight amounts of reverb to their mixes in order to make the audio sound richer and more pleasant. Unlike the other audio filters in Cleaner, reverb actually adds frequencies to the audio track, instead of removing them. Using the Reverb filter may improve the subjective quality of the audio but make your material harder to encode. For the best results, experiment to determine what you like best with your material. Reverb Custom Controls Use the Reverb filter to sweeten the sound. •Decay - controls how fast the reverberations fade out, which alters the apparent size of the room. Higher values equate to a larger room, which generates a longer delay between reverberations and a slower reverb decay time. Values in the 50-70 range are often good starting points. •Mix - controls how much the original signal is mixed with the reverb signal to make the final output. Higher values add more of the reverb signal and make the reverb effect more pronounced. Often this slider has a greater effect on the total reverb than the Decay slider. Values from 10-30 are often good starting points. At high values, this filter can become more of a special effect rather than a subtle enhancement.