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Notch/Hum Filter


    Power lines can introduce a humming noise in audio clips. This can happen when cables or equipment are improperly shielded or grounded. Use the Notch/Hum Filter effect to help remove hum from an audio clip. Because this effect is a notch effect, tuned to remove one frequency, you can use it to remove any unwanted sound that exists at a specific frequency.

    Notch frequency

    Specifies the frequency to be removed. If you are removing power-line hum, type a value that matches the power-line frequency used by the electrical system where the clip was recorded. For example, in North America and Japan type 60 Hz, and in most other countries type 50 Hz.