How to make MP3 files
It is most likely that you make MP3 files from material originating from CD audio. This is a two-stage process. First you digitally extract (rip) the audio data to a WAV file and then you convert (encode) it to MP3. Some programs can rip and encode (you do not need the two-stage process).
1) Convert tracks from CD to WAV format with a CD-Ripper
2) Convert the .wav files to .mp3 format.
To convert WAV to MP3 you need to use a program (MP3 Encoder). During this process you must set the MP3 compression rates. Typically, the following compression rates are available:
- CD quality - 256Kbit/s
- Near-CD quality - 128Kbit/s
- FM Radio Quality - 64Kbit/s
About Bit-rates
The bit-rate affects the size and sound quality of an MP3 file. MP3 files can be encoded at 8 kbps - 320 kbps. The majority of the MP3 files available on the Internet are encoded at 44kHz and 128Kbit/s. These bitrates give a fairlygood quality and size ratio for MP3 files.
Encoding at higher bitrates (192Kbit/s) will produce a better quality results, but at the cost of a considerably larger file size. Tracks recorded at 64Kbit/s and below are sampled at 22kHz.
At higher bit-rates (193 kbps) played on home stereo systems, you will propably not be able to tell the difference between the encoded file and the original.
| Remember that you can have lower bit-rates if you listen to your music on a cell phone or a portable player. The earphones and speakers on most cell phones or portable audio players limit the quality of the sound and bit-rates higher than 96 kbps would be a wast of storage space. |
A 64MB player can hold approx. 1 hour of audio at 128 kbps. At 80 kbps, it could hold almost 2 hours.
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