Yesterday I heard a fantastic presentation in Yarmouth, Maine, by teacher Amy Sanders about her Arab Spring Project. I took notes and shared links during her presentation, and also recorded the presentation with permission using my iPhone and the free iOS app/service Cinch. Unfortunately there was a loud heater fan running in the classroom where Amy shared the presentation, which is pretty distracting in the “raw” recording. This evening I used the free/home version of WavePad software to “Apply Spectral Subtraction.” This was a two part process. After opening the raw mp3 audio file in WavePad I selected a small portion of the recording (about 2 seconds) in which no one talked and ONLY the fan noise was audible.
Then I chose “Apply Spectral Subtraction” from the EFFECTS – NOISE REDUCTION menus.
I saved the edited file in WAV format, normalized it using free Levellator software, and then converted it to a 32 kbps mp3 file using Switch software. I lastly uploaded it to my “Fuel for Educational Change Agents” podcast channel which is running free/open source Podcast Generator software.
I am not entirely pleased with the results, but it is better than the “noisy” original. Do you know of or use a better free (or inexpensive) software option for removing background noise? I tried Audacity‘s noise removal effect but didn’t get good results, WavPad worked better.
At MacWorld in 2007 I saw a vendor floor demonstration of Adobe Audition‘s background noise removal power and was totally blown away. It doesn’t appear Audition is available for standalone purchase, and I don’t really want to pay hundreds of dollars (or even thousands) for an Adobe Creative Suite bundle. I’d love to hear about other free/affordable noise removal audio editing programs besides WavPad, so please share a link as a comment if you’ve got suggestions.
If you’re interested in the techniques I used to normalize the audio file and compress it, I created a screencast of that process a couple of weeks ago you can check out.
If you enjoyed this post and found it useful, consider subscribing to Wes' free, weekly newsletter. Generally Wes shares a new edition on Monday mornings, and it includes a TIP, a TOOL, a TEXT (article to read) and a TUTORIAL video. You can also check out past editions of Wes' newsletter online free!
Did you know Wes has published several eBooks and "eBook singles?" 1 of them is available free! Check them out! Also visit Wes' subscription-based tutorial VIDEO library supporting technology integrating teachers worldwide! MORE WAYS TO LEARN WITH WES: Do you use a smartphone or tablet? Subscribe to Wes' free magazine "iReading" on Flipboard! Follow Dr. Wesley Fryer on Twitter (@wfryer), Facebook and Google+. Also "like" Wes' Facebook page for "Speed of Creativity Learning". Don't miss Wesley's latest technology integration project, "Show With Media: What Do You Want to CREATE Today?"
On this day..
- Preparing for a Stopmotion Art Project - 2014
- Plant Your Flag in the Sand and Claim It - 2011
- Descending into the clouds at sunset (video) - 2011
- Demonstrate iPhone / iPod Touch Applications with ScreenSplitr / DemoGod - 2010
- Just how many electronic whiteboards are school leaders buying? - 2009
- Big Chief Tablets ahead? - 2009
- Smart Technologies software request via Twitter - 2009
- Managing information streams in the attention economy - 2008
- Paying teachers for high student test scores is BAD policy - 2008
- Welcome Glen Bull - 2007