View source for Spoken-Tutorial-Technology/C2/Editing-using-Audacity/English

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|Time
|Narration

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||00:01
||Hello friends. Welcome to the tutorial on Editing using Audacity. 
 
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||00:08
||This tutorial will explain how to edit an audio file. We will learn how to 
 
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||00:14
||open an audio file in audacity
  
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||00:16
||convert a stereo file to mono. Attach labels. Cut,delete,move and amplify the audio. Filter background noise.Save and export the audio file.
  
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||00:27
||For this tutorial, I am using the Ubuntu Linux 10.04 version operating system and Audacity version 1.3.
  
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||00:36
||Audacity supports many audio formats including:
  
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||00:39
||WAV (Windows Wave format) 
 
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||00:41
||AIFF (Audio Interchange File Format) 
  
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||00:43
||Sun Au / NeXT 
 
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||00:46
||RCAM (Institut de Recherce et Coordination Acoustique / Musique) 

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||00:49
||MP3 (MPEG I, layer 3) (export requires separate encoder. see Lame Installation) Ogg Vorbis 
 
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||00:53
||Lets access Audacity through the Main menu item Applications >> Sound and Video >> Audacity.
 
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||01:04
||An audacity help box opens. Let’s click OK. 
 
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||01:09
||To edit an audio file, we need to first import it into Audacity. To do this, go to File >> Import >> Audio.

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||01:21
||When the browser window opens, browse for the audio file to be edited and click on Open.
  
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||01:31
||The file opens in the Audacity window.
  
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||01:36
||Save this file as an a u p file (i.e. Audacity project file) by clicking on File >> Save Project As. 

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||01:47
||Click OK in the box that opens. 
 
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||01:51
||Give your file a name. Here we will type 'Editing in Audacity'..
  
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||01:55
||Check the folder, and Click on Save. 
 
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||02:00
||Select 'Copy All Audio into Project (safer)' option. 
 
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||02:05
||This creates a folder that will contain all the audacity project data files. 
 
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||02:11
||Look at the tracks. If there is only one track, then the audio is in MONO.
 
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||02:16
||This will also be mentioned in the Label on the left panel. 

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||02:21
||Now, lets open another audio file. 
 
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||02:35
||If there are 2 tracks, then the audio is in STEREO. Again, this will be mentioned in the Label on the left panel.
 
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||02:45
||To remove a track completely, select the track, click on Tracks tab and select Remove Tracks. 
 
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||02:59
||Alternately, delete tracks by clicking on the X at the extreme left. 
 
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||03:04
||If the audio file is in stereo mode and stereo output is not required, then one can convert the mode to mono.
  
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||03:12
||To do so, go to the Tracks tab and select Mix and Render.
 
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||03:20
||Now click on the drop-down arrow on the panel to the left of the audio file and select Split stereo to mono.

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||03:30
||Delete one track. 
  
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||03:35
||To zoom into or out of a file click the cursor where you need to zoom on the file and click the zoom in or zoom out button on the Edit panel. 
 
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||03:52
||Alternately, place the cursor over the part of the file that you need to zoom into or out of.

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||04:03
||Now press the Ctrl key down and use the scroll wheel on your mouse to zoom in and out. 
  
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||04:19
||An audio file can be cut to remove unwanted parts, copied, pasted, deleted and treated with some special effects.
  
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||04:29
||The volume of the file can also be increased or decreased.
 
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||04:35
||Before editing, always listen to the whole audio file. You may want to label parts as you listen, for easy reference. 
 
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||04:44
||To do so, add a label track by clicking on Tracks >> add New and Label Track. 
  
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||04:56
||To add a label at a point, select the point with the cursor, go to the tracks tab, 
  
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||04:54
||and select Add label at selection.
   
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||05:08
||You can type into the label.
 
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||05:16
||Alternately, click at the point, 
 
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||05:24
||press Ctrl +B. 
 
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||05:28
||This opens a new Label track the first time.
 
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||05:32
||Consecutive Ctrl+B will open new labels on the same track.
  
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||05:47
||A label will open with the cursor at the point on the time line where the cursor is placed.
 
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||05:53
||Place the cursor wherever required and press Ctrl+B for each new label. 
 
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||06:07
||Labels can also be moved.
 
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||06:15
||To delete the labels, click inside the text box and press backspace till the label is deleted. 

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||06:27
||Another way to do this is to go to Tracks >> Edit Labels.
 
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||06:34
||A window with all the labels listed will appear and the labels that need to be deleted can be selected and deleted by clicking on Remove button. 
 
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||06:46
||Click Ok.
 
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||06:55
||After listening to the entire audio file once or more than once, the structure of the edit can be decided; parts of the file can be deleted or moved, as required. 

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||07:07
||Structure the edit based on what is appropriate for introduction, body and conclusion.
 
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||07:15
||Remove repeats and bad sound. Effects can be used to enhance the impact of a message.
 
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||07:21
||Unwanted sounds such as stammering and coughs that don't overlap the speech, repeats, and long silences can be removed. 

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||07:32
||To delete, select the Selection tool and select the part of the audio that needs to be deleted by left-click, drag and then release, press delete to delete that part of the audio.
 
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||07:50
||To move one segment of audio to another part, select the part of the audio that needs to be moved by left-click, drag and then release, then cut that part by using the keyboard shortcut Ctrl+X.
   
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||08:07
||We can also click on the Cut button in the Edit tools panel OR click on Edit >> Cut option.
  
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||08:22
||Move the cursor to the place where the audio segment needs to be moved, 
  
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||08:31
||click there and paste the audio segment.
 
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||08:33
||This can be done with either the keyboard shortcut Ctrl+V or the Paste button 
 
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||08:40
||In the Edit tools panel or Edit >> 
        
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||08:47
||Paste option. 
  
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||08:52
||To reduce loud breaths, select the breath portion in the audio stream by 

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||09:14
||left-clicking, dragging and releasing. 
  
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||09:17
||Go to Effect >> Amplify. Enter -5 or -7 
 
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||09:26
||or more in the Amplification box, depending on how much you want to reduce the sound, and click Ok

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||09:43
||To increase the volume of the parts that have recorded softly, select the audio go to Effect >> Amplify.
 
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||09:56
||You will see a value already there. This value is optimal amplification for this file. You can also enter the amount you want. 
 
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||10:12
||Click Ok. 
  
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||10:15
||If the Ok button is not active, check the Allow Clipping option. 
 
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||10:34
||To filter out disturbing background noises, select a portion on the track with the sample noise.
  
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||10:47
||Remember to select a portion without voice. Now click on Effect >> 
  
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||10:55
||Noise Removal. 
 
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||10:59
||Click on Get Noise Profile. 
 
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||11:02
||This will identify the noise sample to be filtered.
 
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||11:06
||Now select the whole audio track by clicking anywhere on it. 
 
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||11:11
||Again, click on Effect >> 
 
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||11:16
||Noise Removal. Choose the Noise Reduction Level.
 
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||11:26
||Use the lowest value that reduces the noise to an acceptable level.
 
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||11:31
||Higher values will remove the noise completely but will result in distortion of the audio that remains.
 
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||11:37
||Lets click OK. 
 
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||11:44
||It is advisable not to amplify the audio too much above the recommended value in the box because amplification also enhances background sounds.
 
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||11:54
||Hisses and hums will become more prominent as well.
  
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||11:57
||Save the project file regularly.
 
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||12:00:
||Finally, export the final project to the required audio format i.e. wav, mp3 and others.
 
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||12:09
||We have already covered this part in the earlier tutorial. Kindly refer to it for details. 

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||12:17
||That's all we have in this tutorial. lets just summarize. In this we learned the basics of editing,using audacity 
 
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||12;26
||how to open an audio file ,convert stereo to mono, zoom in and out ,attach lables 
 
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||12:35
|structure and edit. Cut, delete, move audio. Amplify audio. Filter background noise 
 
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||12:50
||Edit the audio that you recorded in the first tutorial using the tips given above. 
 
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||12:55
||Use fade out and fade in where necessary.
   
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||13:01
||Watch the video available at the following link (http://spoken-tutorial.org/What_is_a_Spoken_Tutorial)
 
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||13:06
||It summarises the Spoken Tutorial project
  
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||13:10
||If you do not have good bandwidth, you can download and watch it
  
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||13:15
||The Spoken Tutorial Team conducts workshops using spoken tutorials 

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||13:20
||Gives certificates to those who pass an online test 
 
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||13:25
||For more details contact, contact@spoken-tutorial.org 
 
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||13:30
||Spoken Tutorial Project is a part of the Talk to a Teacher project. 

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||13:35
||supported by the National Mission on Education through ICT, MHRD, Government of India. 
  
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||13:42
||More information on this Mission is available at http://spoken-tutorial.org/NMEICT-intro
  
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||13:55
||This brings us to the end of this tutorial.
 
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||13:58
||Thank you. 
 
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||14:01
||This is Krupa Thimmaiah from ITforChange