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AgendaAudio Recording & Basic Editing: 1:00 – 2:20
10 minute breakAdditional Editing Concepts and Podcasting: 2:30 – 4:00
Audio recordings have been used in education for years…Tape recording of children’s books for early
readersMusic recordings for history, choir, band, etc.Recordings or reenactments of famous
speechesForeign language labsLecture summaries
Benefits of Digital RecordingsMaintain quality over time – don’t degrade
like tapesCan be distributed over the Internet for little
or no cost, compared to the cost of duplicating tapes for students
Don’t require special editing equipment – can be edited on the typical home or school computer with a sound card and free software
Computer Sound SystemAnalog Signal
Sound CardSpeakers orHeadphones
Microphone
Analog Signal
Sound recording or playback
program
Digital Signal
Analog Signal
Digital Signal
Sample Rate
44,100 Hz = “CD
quality”
Sound Recording/Editing ProgramsWindows Sound Recorder – on all school
computersAudacity – on all school computers and can
be downloaded for free at homeAdobe Soundbooth – on all US computersGarage Band – available for Mac computers
Audacity Preferences: Audio I/O
Edit Preferences
Select the Audio I/O tab
Choose the playback and recording devices, if necessary.
Audacity Preferences: QualityThe default quality is
44,100 Hz, which is CD quality
Other default settings should be fine
Audacity Preferences: File FormatsChoose “make a copy
of the file before editing (safer)”. This makes a copy of files that you open in Audacity before you edit them.
Notice the MP3 Export Setup. If you set up Audacity at home, this is the screen where you tell Audacity how to find the LAME encoder, necessary for creating Mp3 files
Changing the Recording Volume
NavigationTo zoom in, choose the Zoom tool, and left-
click.To zoom out, choose the Zoom tool, and
right-click. To make a track taller or shorter, point the
mouse at the bottom edge of the track. When the cursor changes to an up/down arrow, you can change the height of the track.
Recording TipsVoice Over Tips
Recording Tips ReviewFinalize the scriptReview and rehearse the script – capitalize
words, spell out difficult words phonetically, spell out large numbers.
Place the script properly – use a big font for your script, don’t hold it so that it rattles
Record in isolationChoose the best microphone available
Recording Tips ReviewRefresh your voice – have some water or tea
handy to keep your mouth refreshed. Warm up your voice with scales or your
favorite song.Don’t touch the microphone while recording. Don’t speak directly into the microphone – put
it at a 30 to 45 degree angle so that the puff of air which accompanies a spoken “p” don’t hit the mic and create a popping “plosive.”
Basic EditingSelecting & Deleting
Choose the Selection tool, then drag over part of a clip to select it.
To delete the selection, press the Delete key.
Amplifying & Silencing Select a soundChoose Effect AmplifyIncrease or decrease the volume by a given
number of decibels. Entering zero results in no change to the volume.
Combining Two Clips
Saving Your ProjectDon’t forget to save your Audacity project
frequently. From the menu, choose File Save Project,
then choose a location and name for your file. Remember that you will need Audacity to
open an Audacity project file. To create a file that other programs can open or that you can put on the Internet, you must Export the file.
Adding Background MusicTo import a music file, choose Project
Import Audio.To make the music fade in, select the portion
that you want to change with the selection tool, then choose Effect Fade In.
Choose Effect Fade Out to make the music fade out.
Cleaning Up Audio1. Select the portion of the
recording with just background noise.
2. Choose Effect Noise Removal3. Click Get Noise Profile, then
click Close4. Select the portion of the audio to
be repaired5. Choose Effect Noise Removal6. Click the Preview button. 7. Use the Less or More sliders to
achieve the desired effect, then click Close.
Adding EffectsSeveral effects are useful for managing background
music. Change pitchChange speedChange tempo
Select the portion of the audio to be changed, and then choose the desired effect from the Effects menu.
To transition from one piece of music to another, align them so that the two tracks overlap slightly, then apply the Cross Fade Out and Cross Fade In effects.
Saving and Exporting as MP3To save a copy of your Audacity project,
choose File Save Project. Audacity projects can only be opened by
Audacity. To allow others to listen to your project, export it as a WAV file or an MP3 file. File Export as MP3.
When exporting an MP3 file, you will be asked to provide ID3 information. This information appears in the media player (such as iTunes) when someone listens to your podcast.
Identifying your PodcastTitle: create an
episode title for your podcast.
Artist: your nameAlbum:
“Prestonwood Christian Academy”
Year: current yearGenre: “Other”
Listening to your Audio FileiTunesWindows Media Player
What is a Podcast?http://www.vimeo.com/926896An audio or video file …Distributed by subscription over the Internet
Basic Steps in Podcasting1. Create an audio (or video) file in a common
media player format, such as MP32. Save the audio file on a publicly-accessible
website3. Create an RSS feed for the audio file4. Let listeners know where to find your RSS
feed. For example, post a link to the feed on your class home page.
Podcasting increases comprehension…Assign a podcast prior to introduction of
new material, have students listen, then come to class with questions
Allow students to replay a lecture – focusing in the parts they didn’t understand in class
Have students review a summary of key concepts after a lecture
Cover material for students who are absentIntroduce new vocabulary words before a
lesson
It’s free!
Sample Feed URLhttp://www.gcast.com/u/jackieking/
main.xml
Create Additional Channels
It’s easy!
Upload or Record Audio
Select an Audio File
Publish An Entry to a Podcast
Through EDLINE…
Review1. Create an account on GCAST2. Upload audio files from your computer3. Create an assignment on EDLINE that links
to your podcast4. Direct students to subscribe to your podcast
through Internet Explorer, iTunes or e-mail updates.
What’s Next?Keep adding audio files to GCAST on a
regular basis, so that students continue to expect them
No additional setup is necessary in GCAST or EDLINE. New files will automatically appear in the feed aggregator your students selected.
Take Advantage of Existing PodcastsThousands of educational podcasts are
available on the InternetCheck the iTunes store for K-12 educational
podcasts or the Education Podcast network at www.epn.org
Science teachers might be interested in Dale Basler’s podcasts.