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Applying audio filters

As you learned earlier, audio filters and video filters are applied in about the same way. Here, you'll first remove noise from an audio clip, and then add some reverberation to the same clip.

1.
Set the Time Unit menu in the Timeline to 2 Seconds.

2.
Using the scroll bar on the right side of the Timeline, scroll the audio tracks, if necessary, so that Audio 1 and Audio 2 tracks are visible.

3.
Drag Voice1.aif from the Project window into the Audio 2 track so that its Out point snaps to the end of the last clips in the project.

You'll need to unmute the Audio 2 track before you work with Voice1.aif.

4.
Click the box on the far left of the Audio 2 track so that the speaker icon () appears.

5.
Preview Voice1.aif by moving the edit line to the beginning of the clip and pressing the Play button under the Program view. Notice the constant noise in the clip.

The Notch/Hum filter in Premiere can be used to remove or reduce hum (low-frequency noise) or other single-frequency noise in an audio clip. You'll use the Notch/Hum filter to remove noise from the Voice1.aif clip.

6.
In the Timeline, select Voice1.aif and open the Filters dialog box.

7.
In the Available list, double-click Notch/Hum Filter.



8.
Click the Preview sound box. Premiere plays a short loop of audio from the audio track.

The frequency of the noise in Voice1.aif is 800 Hz.

9.
Drag the slider in the Notch/Hum Filter dialog box while listening to the audio preview.

Notice that as the filter setting (to the right of the slider) approaches 800 Hz, the noise is reduced. To set the filter precisely at 800 Hz, you'll enter that value.

10.
Type 800 in the Hz box, and then click OK to close the Notch/Hum Filter dialog box. Click OK again to close the Filters dialog box.

11.
Preview Voice1.aif again. The noise is now nearly inaudible. Also notice that the audio sounds flat. Let's add some life to it.

Now you'll apply a filter to add reverberation to the same audio clip. The Reverb filter simulates sound bouncing off hard surfaces in either a medium-sized room or a large room.

12.
Click in the Timeline window title bar to make it active. With Voice1.aif still selected, open the Filters dialog box and double-click Reverb in the Available list.



13.
Select Preview Sound, select Medium room, and set Mix to about 20%. Set Decay to a value that makes the audio sounds like it is coming from a medium-sized room (we used 20%).

14.
Click OK to close the Reverb dialog box, and then click OK to close the Filters dialog box.

Before previewing Voice1.aif and Music1.aif together, you'll need to unmute the Audio 1 track.

15.
Click Voice1.aif again to deselect it.

16.
Click the box on the far left of the Audio 1 track so that the speaker icon () appears.

17.
Preview Voice1.aif and Music1.aif together by moving the edit line to a point several seconds before the beginning of Voice1.aif and pressing the Play button under the Program view. You have just improved the quality of the sound in your project significantly!

18.
Save the project.


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