Advanced Video Camera and Editing

Removing Hums

Electrical interference, such as that caused by computers or florescent light, has a very specific frequency based on the rate of the alternating current. That rate in the United States is 60-Hz, which can produce noise in your audio, much like a humming sound. Because that 60-cycle hum is so common, Final Cut Pro has a filter specifically designed to remove it.

  • Double-click to select the clip
  • Choose Effects > Audio Filters > Final Cut Pro > Hum Remover
  • In the Viewer, click the Filters tab

Press Shift-\ (backslash) to Play In to Out

Although the filter is applied, the hum is still audible because, in addition to the 60-cycle noise, you can also hear its harmonics (other frequencies that resonate along with the noise).

Experiment with selecting and deselecting the harmonic checkboxes. Often it takes more than one combination of selections to remove the hum. The hum filter is designed to remove the hum commonly caused by electrical interference. But it's really just a notch filter (an equaliser targeting a single frequency range) preset to 60 Hz. You can change the particular narrow-frequency band by changing the Frequency setting of this filter, or by employing a generic notch filter or parametric EQ in Final Cut Pro or Soundtrack Pro.