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DECP 05: Developing e-Content

e-Learning in broader way


Audacity is a program that manipulates digital audio waveforms. In addition to recording sounds directly from within the program, it imports many sound file formats, including WAV, AIFF, MP3, and Ogg Vorbis. PCM formats of 8, 16, 24 and 32−bits can be imported and exported. Audacity works with tracks and contains one audio file. This file is editable and all actions are undoable. Undo's are instantaneous. Almost anything is undoable, including importing and deleting tracks. What makes Audacity unique?

  1. Audacity is free and the source code is available under the GNU General Public License.
  2. Audacity is cross−platform − it runs on Windows (98 through XP), Mac OS X, and many Unix platforms, including Linux. Previous versions worked with Mac OS 9.
  3. No limits on the number of tracks or the length of any track, except the size of your hard disk. Import almost anything: WAV, AIFF, Next/AU, IRCAM, MP3, and Ogg Vorbis files are supported natively, but Audacity will also open just about any uncompressed sound file and automatically deduce the format (using the Import Raw Data... feature).
  4. Audacity not only includes many high−quality effects built−in, but also lets you use LADSPA and VST plug−in effects. There are dozens of free, shareware, and commercial plug−ins online that do everything from Reverb to Noise Reduction.
  5. Audacity supports plug−ins written in the Nyquist programming language, a high−level language designed specifically for working with audio.
  6. Audacity acts like a non−destructive editor, providing multiple levels of undo, but it also writes changes made to the audio to disk, eliminating the need for complicated real−time processing.
  7. Label tracks allow you to annotate waveforms (for example, transcribing speech) and later export the waveforms to a text file.
  8. Powerful spectral features allow you to view waveforms as spectrograms or plot the power spectrum of any region of audio, and even export this data to a spreadsheet.
  9. Pitch−changing and tempo−changing effects

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