Audacity/C3/Edit-an-audio-using-Audacity/English-timed

Time	Narration
00:01	Hello Everyone. Welcome to this tutorial on Edit an Audio in Audacity.
00:07	In this tutorial, we will learn to edit an audio track in Audacity.
00:14	To record this tutorial I am using Ubuntu Linux OS version 14.04 , Audacity version 2.1.2
00:25	To practise this tutorial, learners should Have installed Audacity on their system and
00:32	Have working knowledge of Audacity software
00:36	If not, for more details, refer to the Translation and Dubbing series on this website
00:43	I will use this timed-script for editing purpose.
00:48	To practise alongside, the same script has been provided in the Code Files link of this tutorial. Please download and use it.
00:58	Now let us open an existing Audacity project file to edit the audio.
01:04	Earlier, we had dubbed an audio and saved it as Hindi-What-is-ST.aup on our machine. We will open that same file here.
01:16	Now, go to the saved folder and double-click on Hindi-What-is-ST.aup to open the file.
01:25	The .aup file opens up.
01:28	We can see the audio track here.
01:32	Before proceeding further, it is advisable to make a copy of the project file.
01:38	In case of any major editing mistake, we can always use the original audio recording.
01:45	To make a copy, click on File and then on Save Project As option. Give a suitable name.
01:55	I will give a name as Copy-Hindi-What-is-ST.aup.
02:02	Select the location. I will choose Desktop and then click on Save.
02:09	Now, we have a copy of the original recording.
02:13	We will continue with this project file.
02:17	First let us learn how to Zoom In and Zoom Out.
02:22	Place the cursor on the audio track.
02:25	On the Edit Toolbar click on Zoom In and Zoom Out buttons.
02:32	We can see how the audio track gets zoomed in and zoomed out.
02:39	Next, let us learn how to filter out disturbing background noises.
02:45	Select the portion on the audio track which has the noise. Remember to select a portion without voice.
02:54	Now in the Main Menu, click on Effect and then on Noise Removal/Noise Reduction.
03:03	Step 1: Click on Get Noise Profile. On doing so, the selected portion will be considered as a noise sample for further processing.
03:15	Then click anywhere on the timeline to deselect the portion.
03:20	Once again, in the Main Menu, click on Effect and then on Noise Removal/Noise Reduction.
03:28	Now in Step 2: Change the value in the field Noise reduction.
03:35	Use the recommended value or a lower value, that reduces the noise to an acceptable level.
03:42	I will choose an appropriate value say 18. You may also use the slider.
03:50	Higher values will remove the noise completely.
03:54	However, it will also result in distortion of the voice in the audio track.
04:00	Hisses and hums will become more prominent, as well. Hence, choose this value carefully.
04:07	Make sure that, in the Noise section, Reduce/Remove radio button is selected.
04:14	Then click on OK.
04:17	It may take some time to remove the noise, if the audio track is very long. The process is now complete for this sample.
04:26	Now, let us play the recording by clicking on the Play button.
	Add the audio
04:37	The noise is now removed from the entire track.
04:41	Note: In some cases, you may have to repeat the process to further reduce the noise.
04:48	However, too much of noise reduction, may give a metallic effect to the recorded voice. Hence, do noise removal carefully.
04:59	Let us now save the project file by pressing Ctrl + S keys.
05:05	Do so regularly as we go along.
05:08	It is advisable to save the project file whenever we have done any modification.
05:15	Let us now increase the volume of the audio segment that has been recorded at a lower volume.
05:22	Select the portion in the audio track, then go to Effect and then on Amplify.
05:30	We can see a value in the Amplification box.
05:34	This is the optimal amplification value for this file, recommended by Audacity. But we can also enter another value if we want to.
05:45	To reduce the volume, enter negative values, say -10.
05:51	To increase the volume, enter positive values, say 15.
05:57	It is advisable not to amplify the audio above the recommended value in the box.
06:03	Too much of amplification will also enhance the background noises, hisses and hums.
06:10	We can also use the slider to adjust the values. I will keep the value as 10.
06:18	Check the Allow Clipping option.
06:21	Then click on OK.
06:24	Sometimes, an audio file contains unwanted repeats and unwanted sounds.
06:30	We can remove these by using the Cut, Copy and Paste options.
06:36	First, I will split this audio clip as per my Timed script timings.
06:41	Let me play the audio. Press the Play button in the VCR controls.
	Add the audio
06:53	I have stopped at the end of the first sentence, by pressing the Stop button in the VCR controls.
07:00	I need to split the audio here.
07:03	For that, click on the Selection Tool. Make sure that the cursor is at the end of the first sentence.
07:11	Now press Ctrl+I, which is the shortcut to split the audio track into separate clips.
07:18	Then, slide the next clip to the timing that we want.
07:23	I will slide it to the timing given in my Timed script.
07:27	For this, click on Time Shift Tool.
07:30	Observe that the cursor is now changed to double-headed arrow.
07:35	I will shift the clip by pressing the left mouse button and dragging it to the required time.
07:43	I will repeat this process once again for the next sentence. Play the audio.
	Add tha audio
07:55	I have stopped the audio by pressing the Stop button.
07:59	I will split the audio here. For that, click on the Selection Tool.
08:06	Make sure that the cursor is at the end of the second sentence.
08:11	Now I will press CTRL+I to split the audio.
08:16	Ensure that the Time Shift Tool is selected.
08:20	Press the left mouse button and drag it to the required time.
08:25	Likewise, we can split and slide the remaining segment of the audio, as per the requirement.
08:32	Notice that there are 4 individual audio segments, at their respective timings on the audio track.
08:40	Save the file before moving ahead by pressing Ctrl + S.
08:45	Now let us learn to cut, copy and paste on the Audio Track.
08:51	Ensure that Selection Tool is selected.
08:55	Then click on the Audio track at the beginning of the third sentence
09:00	Play the audio.
	Add the Audio file
09:11	I have clicked on the Stop button to stop playing the audio.
09:16	We can see that the third sentence ends here.
09:20	But it has some unwanted sounds and repetitions which we need to delete.
09:26	Select the portion of the audio that needs to be deleted, by dragging the mouse.
09:33	Then press the Delete key on the keyboard.
09:37	Note that when you do this the remaining audio segments move forward on the audio track. That audio clip has been removed from the audio track.
09:48	Now let us learn to move an audio clip from one place to another place on the audio track.
09:55	Select the audio clip that needs to be moved.
09:59	In the Main menu, click on Edit and then click on Remove Audio or Special and then select Cut. Or else use the keyboard shortcut Ctrl+X
10:14	Note that when you do this, the remaining audio segments move forward on the audio track. Which means it will change the timing of the remaining audio segments.
10:26	And, we need to re-arrange the timing of the remaining audio segments all over again.
10:33	What if we don’t want to change the timings of the remaining segments? Let me show you what to do.
10:41	First, undo the last action by pressing CTRL+Z keys.
10:47	Then again select the audio clip once that needs to be removed.
10:52	Now, press Ctrl + Alt + X keys on your keyboard.
10:58	This will not only cut the audio segment but also keep the remaining segments in their place.
11:05	Please note the difference between the two actions.
11:09	Next, select a portion of an audio segment to be copied.
11:14	I will select a portion here and click on Edit and Copy. Or else use the keyboard shortcut Ctrl+C.
11:25	To paste, move the cursor to the place where the audio segment needs to be placed and click there once.
11:33	Then click on Edit and Paste. Or else use the keyboard shortcut Ctrl+V.
11:43	Notice here - the 2 segments appear to be merged. But it is not so.
11:49	Merge the two segments by clicking on the joint between the 2 segments.
11:54	Now you can move the whole segment wherever you want.
11:59	Let me zoom out here to view the whole audio segments.
12:04	Observe that if I try to move this audio clip to the beginning of this track, I am not allowed to do so.
12:12	This is because there is no sufficient space available there to accommodate this clip.
12:18	Now, let us try the first audio segment.
12:22	Drag the 1st audio segment and move it to the end of the fourth audio segment.
12:28	After creating space, we are able to move the second segment to the beginning of the track. This is because now there is enough space available here.
12:40	So the standard rule is to first create sufficient space on the track and then move the segments.
12:48	Undo the last action by pressing CTRL + Z keys.
12:53	Once all the edits are complete, save the project file once again.
12:58	Lastly, we need to Export the final project into a format suitable for playback.
13:05	Let us export this file into mp3 format.
13:09	For this, go to the Main menu bar. Click on File and then on Export.
13:15	The Export file dialog box appears. It will ask us for a name. Enter the preferred name for this file.
13:26	I will name the file as Hindi-What-is-ST.
13:30	Also select the location where it has to be saved. I will choose Desktop.
13:37	Below this, we can see a drop-down called file type or Format.
13:43	It has various audio formats like wav, mp3, ogg, etc.
13:52	I will choose MP3 files as the format.
13:57	Then click on Save.
14:00	Next we will get a dialog called Edit Metadata.
04:05	Here, we can add the Artist Name and other information as per our requirement. I will leave these fields blank.
14:15	Click on OK. This will save the output as Hindi-What-is-ST dot mp3 file.
14:22	This may take some time to complete.
14:25	Now, go to the folder where we saved the file. Here is the mp3 file which we exported.
14:32	Let us play this file using any standard audio player.
	Add the Audio file
14:49	This brings us to the end of the tutorial.
14:52	Let me summarize the tutorial.
14:55	In this tutorial we have learnt how to- Open an existing dot aup project file
15:03	Zoom in and out on the audio track Filter background noise
15:09	Amplify the audio Cut, copy, paste, delete, move an audio clip
15:17	Merge two audio clips Save and export the audio into .mp3 format.
15:25	As an assignment, edit an audio file using the timed-script.
15:31	The video at the following link summarises the Spoken Tutorial project. Please download and watch it.
15:39	The Spoken Tutorial Project Team: conducts workshops and gives certificates For more details, please write to us.
15:49	Please post your timed queries in this forum.
15:53	Spoken Tutorial Project is supported by the NMEICT, MHRD, Government of India. More information on this Mission is available at this link.
16:05	This script has been contributed by the Spoken Tutorial Team. And this is Mousumi Medhi from IIT Bombay signing off. Thanks for joining.

Contributors and Content Editors

PoojaMoolya