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Chapter 11. Mixing Audio > Using a High- or Low-Pass Filter

Using a High- or Low-Pass Filter

High- and low-pass filters are most often used to remove unwanted sounds from individual tracks. When recording, it's easy to wind up with low-frequency hum and rumble or high-frequency noise and hiss. The low-end junk might be traffic noise, nearby appliances, or ground loops; the high-end noise might be tape hiss or an air conditioner. A high-pass filter can also help when an instrument was recorded near a drum kit; a carefully set high-pass filter can remove most of the unwanted leaked sound from the simultaneous recording of a nearby kick drum.

This next task shows you how to deal with another common scenario. High-frequency noise and hiss can easily work their way into a recorded track. You can use a low-pass filter to get rid of much of this high-frequency content.


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