Editing using Audacity
From Process | Spoken-Tutorial
|Hello friends. Welcome to the tutorial on Editing using Audacity.
|This tutorial will explain how to edit an audio file. We will learn how to
|open an audio file in audacity
|convert a stereo file to mono. Attach labels. Cut,delete,move and amplify the audio. Filter background noise.Save and export the audio file.
|For this tutorial, I am using the Ubuntu Linux 10.04 version operating system and Audacity version 1.3.
|Audacity supports many audio formats including:
|WAV (Windows Wave format)
|AIFF (Audio Interchange File Format)
|Sun Au / NeXT
|RCAM (Institut de Recherce et Coordination Acoustique / Musique)
|MP3 (MPEG I, layer 3) (export requires separate encoder. see Lame Installation) Ogg Vorbis
|Lets access Audacity through the Main menu item Applications >> Sound and Video >> Audacity.
|An audacity help box opens. Let’s click OK.
|To edit an audio file, we need to first import it into Audacity. To do this, go to File >> Import >> Audio.
|When the browser window opens, browse for the audio file to be edited and click on Open.
|The file opens in the Audacity window.
|Save this file as an a u p file (i.e. Audacity project file) by clicking on File >> Save Project As.
|Click OK in the box that opens.
|Give your file a name. Here we will type 'Editing in Audacity'..
|Check the folder, and Click on Save.
|Select 'Copy All Audio into Project (safer)' option.
|This creates a folder that will contain all the audacity project data files.
|Look at the tracks. If there is only one track, then the audio is in MONO.
|This will also be mentioned in the Label on the left panel.
|Now, lets open another audio file.
|If there are 2 tracks, then the audio is in STEREO. Again, this will be mentioned in the Label on the left panel.
|To remove a track completely, select the track, click on Tracks tab and select Remove Tracks.
|Alternately, delete tracks by clicking on the X at the extreme left.
|If the audio file is in stereo mode and stereo output is not required, then one can convert the mode to mono.
|To do so, go to the Tracks tab and select Mix and Render.
|Now click on the drop-down arrow on the panel to the left of the audio file and select Split stereo to mono.
|Delete one track.
|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.
|Alternately, place the cursor over the part of the file that you need to zoom into or out of.
|Now press the Ctrl key down and use the scroll wheel on your mouse to zoom in and out.
|An audio file can be cut to remove unwanted parts, copied, pasted, deleted and treated with some special effects.
|The volume of the file can also be increased or decreased.
|Before editing, always listen to the whole audio file. You may want to label parts as you listen, for easy reference.
|To do so, add a label track by clicking on Tracks >> add New and Label Track.
|To add a label at a point, select the point with the cursor, go to the tracks tab,
|and select Add label at selection.
|You can type into the label.
|Alternately, click at the point,
|press Ctrl +B.
|This opens a new Label track the first time.
|Consecutive Ctrl+B will open new labels on the same track.
|A label will open with the cursor at the point on the time line where the cursor is placed.
|Place the cursor wherever required and press Ctrl+B for each new label.
|Labels can also be moved.
|To delete the labels, click inside the text box and press backspace till the label is deleted.
|Another way to do this is to go to Tracks >> Edit Labels.
|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.
|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.
|Structure the edit based on what is appropriate for introduction, body and conclusion.
|Remove repeats and bad sound. Effects can be used to enhance the impact of a message.
|Unwanted sounds such as stammering and coughs that don't overlap the speech, repeats, and long silences can be removed.
|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.
|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.
|We can also click on the Cut button in the Edit tools panel OR click on Edit >> Cut option.
|Move the cursor to the place where the audio segment needs to be moved,
|click there and paste the audio segment.
|This can be done with either the keyboard shortcut Ctrl+V or the Paste button
|In the Edit tools panel or Edit >>
|To reduce loud breaths, select the breath portion in the audio stream by
|left-clicking, dragging and releasing.
|Go to Effect >> Amplify. Enter -5 or -7
|or more in the Amplification box, depending on how much you want to reduce the sound, and click Ok
|To increase the volume of the parts that have recorded softly, select the audio go to Effect >> Amplify.
|You will see a value already there. This value is optimal amplification for this file. You can also enter the amount you want.
|If the Ok button is not active, check the Allow Clipping option.
|To filter out disturbing background noises, select a portion on the track with the sample noise.
|Remember to select a portion without voice. Now click on Effect >>
|Click on Get Noise Profile.
|This will identify the noise sample to be filtered.
|Now select the whole audio track by clicking anywhere on it.
|Again, click on Effect >>
|Noise Removal. Choose the Noise Reduction Level.
|Use the lowest value that reduces the noise to an acceptable level.
|Higher values will remove the noise completely but will result in distortion of the audio that remains.
|Lets click OK.
|It is advisable not to amplify the audio too much above the recommended value in the box because amplification also enhances background sounds.
|Hisses and hums will become more prominent as well.
|Save the project file regularly.
|Finally, export the final project to the required audio format i.e. wav, mp3 and others.
|We have already covered this part in the earlier tutorial. Kindly refer to it for details.
|That's all we have in this tutorial. lets just summarize. In this we learned the basics of editing,using audacity
|how to open an audio file ,convert stereo to mono, zoom in and out ,attach lables
|structure and edit. Cut, delete, move audio. Amplify audio. Filter background noise
|Edit the audio that you recorded in the first tutorial using the tips given above.
|Use fade out and fade in where necessary.
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|This brings us to the end of this tutorial.
|This is Krupa Thimmaiah from ITforChange