Using the Notch effect
The Notch effect removes frequencies near a specified value. The effect targets a frequency
range and eliminates those sounds. The effect works well for removing power-line hum and
other electrical interference.
1. Open the sequence 08 Notch Filter.
2. Play the sequence, and listen for the electrical hum. You can hear fluorescent light bulbs
buzzing.
3. In the Effects panel, locate the Notch Filter effect (not the Simple Notch Filter effect) and
apply it to the clip in the sequence. When you do, the clip is automatically selected, so the
effect controls will appear in the Effect Controls panel.
4. In the Effect Controls panel, click the Edit button for the Notch filter.The Notch Filter effect looks a lot like the Parametric Equalizer effect and functions in a
similar way. However, you will notice there’s no Q control, which sets the sharpness of the
curves. By default each adjustment is extremely acute, and a Notch Width menu allows you
to adjust the curves.5. While playing the sequence, experiment with presets and listen to the results.The presets usually apply multiple adjustments. This is because signal interference is often
found in multiple harmonic frequencies.
6. Choose 60Hz And Octaves from the Presets menu and then listen to the sequence again to
find out whether it’s improved.
7. Often, when working with the Notch effect, you’ll listen, adjust, and listen again until you
get the settings you need.This audio has hum at 60 Hz, 120 Hz, and 240 Hz. These and more have been targeted by
the preset you chose. Turn off control points 4, 5, and 6 by clicking the enable buttons.