Apple Final Cut Pro 7 - Manual (Page 967)

Hum Remover
The Hum Remover lets you get rid of “cycle hum” that may have been introduced into
your audio recording by power lines crossing your cables or by a shorted ground wire in
your setup. Hum from power sources generally sounds like a low buzzing and has a
frequency that corresponds to the electrical power in your country (for example, countries
in North America use 60 Hz AC power, whereas most countries in Europe use 50 Hz power).
• Frequency: This slider lets you select the frequency of hum that this filter will attempt
to remove. Different countries use different power frequencies, so you need to specify
exactly what frequency to tune out. In general, most alternating current (AC) operates
at either 50 or 60 Hz.
• Q: This slider adjusts the filter resonance around the value of the Frequency slider.
Higher Q values result in a narrower but stronger resonance, which limits the frequencies
affected by the filter. If the important elements of your recording overlap into the
frequencies that are being filtered out, you might want to narrow the range of
frequencies affected.
• Gain: This slider lets you set how much of the signal you’re attenuating. By default, it’s
set to the maximum value of –60 dB.
• Harmonics: These options allow you to attenuate additional frequencies that may be
introduced into your signal as a result of the primary cycle hum. These frequencies are
automatically derived by the filter, and you can specify up to five.
Vocal DeEsser
The Vocal DeEsser allows you to attenuate the “ess” sounds produced by an actor with
a “sibilant” voice (that is, someone whose “ess” sounds are very pronounced), or by a
microphone that accentuates high frequencies. This filter is essentially a specialized EQ
filter that reduces, but does not eliminate, these high-frequency “ess” sound components.
Vocal DePopper
The Vocal DePopper lets you attenuate the harsh “P” sounds that result from puffs of
breath bursting into the microphone. Proper miking should prevent this in the first place,
and if you have just one or two pops, you can use keyframes to reduce the level of the
frames with the pop. (See
“Example: Setting Subframe Audio Keyframes to Eliminate
Clicks.” )
967 Chapter 59 Using Audio Filters