Adobe After Effects CS3 Manual do Utilizador descarregar pdf (Página 380)

AFTER EFFECTS CS3

User Guide

375

Stereo Mixer effect

The Stereo Mixer effect mixes the left and right channels of audio and pans the entire signal from one channel to the

other.

Invert Phase Inverts the phase of both channels of the stereo signal. Use this control to prevent two sounds at the

same frequency from canceling each other out.

See also

“Preview video and audio” on page 120

Tone effect

The Tone effect synthesizes simple audio tones to create sounds, such as the low rumble of a submarine, a telephone

ringing in the background, sirens, or a laser blast. You can have up to five tones for each instance of the Tone effect,

to create a chord. When you apply this effect to a layer with audio, the dry (original, unprocessed) audio is ignored,

and only the tone plays.

You can also apply the Tone effect to a layer that has no audio, such as a solid layer, to synthesize audio.

Note: The Tone effect doesn’t generate audio on a placeholder layer; for the effect to generate audio, you must replace the

placeholder with a footage item.

Waveform Options Specifies the type of waveform to use. Sine waves produce the purest tones. Square waves

produce the most distorted tones. Triangle waves have elements of both sine waves and square waves but are closer

to sine waves. Saw waves have elements of both sine waves and square waves but are closer to square waves.

Frequency Frequency in Hz. To turn off a tone, set its frequency to 0.0.

Level Changes the amplitude of all tones in this instance of the effect. To avoid clipping and popping, use a Level

value that is no greater than 100 divided by the number of frequencies you use. For example, if you use all five

frequencies, specify 20%.

Note: To avoid clicks at the end of a tone, set a keyframe for the desired Level value at the frame just before the end of

thetone,andthensetakeyframeforaLevelvalueof0.0attheendofthetone.Thistechniqueworkswellforanyaudio

that you end abruptly.

See also

“Preview video and audio” on page 120

“Set keyframes” on page 187

Blur & Sharpen effects

About Blur & Sharpen effects

In general, blur effects sample the area around a pixel and assign to the pixel a new value that is the average of the

sampled values. Increased blurriness is the result of increasing the size of the sample, whether this is expressed as a

radius or a length.

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