Any rate below 16kHz will sound poor, with 8kHz being 'telephone quality'.Ĭhanging the sample format: the default "sample format" is "32-bit float", which means that 4 bytes will be devoted to each sample. To re-sample, click on Project Rate in the bottom left of the Audacity window and choose the desired rate from the popup. You can reduce file sizes by 're-sampling' the file to a lower rate, 22kHz being satisfactory for speech. Reducing file sizeĬhanging the sample rate: by default, your recordings will be 'sampled' at 44kHz, which is CD quality sound. Stereo v Monoīy default, the recording kit will produce a stereo file, which when opened in Audacity will appear as two tracks, one above the other. Exporting to MP3 is relatively time-consuming, particularly for large files.
Saving in the Audacity format is helpful as it preserves non-audio data such as labels. Whilst you're working on the audio file, it's quicker to save to Audacity's own file format via File | Save Project or Save Project As., then when you've finished editing and have the file as you want it you can export it to MP3 with File | Export as MP3. The labels have no effect on the audio clip - they are purely visual aids to editing. If you're playing back you can also pause the playback and choose Project | Add Label at Playback Position, or press Ctrl-M. A red flag should appear in a 'Label Track' below the waveform, so then type a meaningful but short name for the marker, eg 'part1'. To create a label to mark a position in a sound file, click in the waveform where you want the label to appear then choose Project | Add Label at Selection, or press Ctrl-B. There's also links to 'screencast' tutorials on Audacity Audacity on the (e-learning Nottingham) site. There are some tips and tricks below which you might find useful. You should also add at least minimal metadata (see below) when prompted.
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A time-limited trial is available for download, and the full package costs $60 or so.Īs an hour-long lecture could result in a MP3 file of some 40Mb, your students will thank you for editing it into smaller chunks, if you can.
Soundforge, the 'professionals choice'.It's shareware which will only allow up to 150 commands each session after which it packs up and you have to quit and restart, but this is usually enough for simple editing tasks. Goldwave, which is a little idiosyncratic in its interface but easy to use once you get used to it.
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NB: Audacity, for patent reasons, can't directly export MP3 files - you have to download a separate MP3 encoder file known as LAME and place that on your machine - see the Audacity FAQ for details and links to the LAME downloads for Windows and Mac. Audacity is available for PC, Mac and Linux. For editing your podcasts (or any audio clips) a very good, and recommended tool is the free, Open Source, and highly-featured Audacity, which you can download from the Audacity website.
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