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This tutorial shows a method of recording speech and preparing it for podcast. Our goal is to convert .wav files saved on an iPod to .m4a files for delivery in iTunes with best compression.
| A Microphone to iTunes | |
| Step 1 | Let’s assume that we use a latest iPod with XtremeMac’s MicroMemo and a lapel mic. |
| Step 2 | Connect the iPod to a Mac or a PC with iTunes installed. iTunes will automatically import the recordings into Voice Memos. Each recording is stamped with date & time at the time of recording on the iPod. |
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| Step 3 | With a mouse, drag onto the Desktop the recordings(s) you would like to edit. You will see a .wav file on the Desktop. |
| iTunes to Amadeus (or, any other applications for editing audio files) | |
| Step 1 | Drag the .wav files onto the Amadeus application icon. Once in Amadeus, perform any editing necessary (trimming, amplitute adjustment, etc.) and choose File:Save As… |
| Step 2 | In the Format pull-down menu, select Mp3. |
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| Step 3 | Click on Settings…, and choose the Bit Rate of 16kbps. The lower the bitrate, the smaller the file and the lower the sound quality. 16kbps is as low as you should go. |
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| Step 4 | It is important to name the new & smaller .mp3 file under a good name such as: mat121-2006-11-30.mp3
Naming schemes with a date stamp will help you organize your voice files as the number grows. |
| Step 5 | To give you an idea of how dramatic the file size reduction is from wav to mp3, a typical 50-minute class recording will amount to a roughly 50MB wav file. When this file is saved to an mp3 file with a lower 16kbps bit rate, the size will be about 5MB. Yes, mere 1/10 of the original size. Since podcast audio/video files are NOT streamed, it is important to keep the size as small as possible. |
| Course Info | Office Hours | Exams | LiveMath | TI | Help | |
KU | Math Dept | Home |
| KU Interactive Mathematics |
Disclaimer • Updated August 20, 2008
Email: mitsuma@kutztown.edu