ADOBE AFTER EFFECTS 7.0
User Guide
388
Amplitude Modulation Specifies the amount of amplitude modulation.
See also
“Previewing audio” on page 136
Parametric EQ effect (Pro only)
The Parametric EQ effect either emphasizes or attenuates specific frequency ranges. Parametric EQ is useful for
enhancing music, such as boosting low frequencies to bring up bass. Using this effect, you can enhance up to three
different bands of the audio footage. As you adjust controls, a Frequency Response graph indicates the combined
equalization curve you create. On the Frequency Response graph, Band 1 is red, Band 2 is green, and Band 3 is blue.
You may find it easier to specify controls if you determine in advance the frequency-response curve you want.
Adjust the following controls for the Parametric EQ effect:
Band Enabled Activates an equalization band and its controls.
Frequency Specifies which frequency to modify. This frequency acts as the peak of the effect—the center of the
bandwidth you specify.
Bandwidth Sets the range of frequencies to enhance above and below the frequency specified under Frequency.
Boost/Cut Specifies the amount of boost or cut applied to the amplitude of the frequencies inside the specified
bandwidth. Positive values boost; negative values cut.
If you have audio with an unwanted sound (such as a beep from a forklift in the background), you can isolate and
cut the frequency range of the beep to attenuate the sound. You may need to experiment with several settings to
isolate the frequency range. To do this, set keyframes for different Parametric EQ properties, and then preview the
audio.YoucanalsoapplytheAudioSpectrumeffecttoamotionfootagelayertoseethemagnitudeofthefrequencies
in the range you define.
See also
“Previewing audio” on page 136
“Using keyframes” on page 192
“Audio Spectrum effect” on page 442
Reverb effect (Pro only)
The Reverb effect simulates a spacious or acoustically live interior by simulating random reflections of a sound off a
surface.
Adjust the following controls for the Reverb effect:
Reverb Time (ms) Specifies the average time, in milliseconds, between the original audio and the reverberated audio.
Diffusion Specifies how much the effect scatters the original audio. More diffusion can make the audio sound farther
from the microphone.
Decay Specifies the amount of time it takes for the effect to subside. A higher value simulates a larger space.
Brightness Specifies the amount of detail preserved from the original audio. More brightness can simulate a room
with live, or highly reflective, acoustics.
Dry Out, Wet Out Specify the mix of the unprocessed (dry) audio to the processed (wet) audio in the final output.
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