An MP3 and WMA Primer D-2
Making MP3s or WMAs — audio extraction
The first phase in making an MP3 or WMA file is extracting audio data from an
audio CD. To extract audio data, you will need a CD-ROM drive that can extract
digital audio data, and a program known as a Ripper. This program uses the CD-
ROM drive to read the audio tracks from the audio CD and stores it on your hard
disk. The time needed for a successful audio extraction depends on:
• CD-ROM drive speed
• defects, like scratches on the audio CD
• error-checking features on the CD-ROM drive
Making MP3s or WMAs — encoding
Encoding is the second phase of making an MP3 or WMA file. Encoders are used to
convert the stored audio tracks, usually WAV files, into these formats. The
encoding process is considered lossy compression, which means that some data is
lost during compression. However, using the standard sampling rate and bitrates
will ensure that your MP3 or WMA files retain much of their audio quality.
The standard bitrate of most MP3 files is 128 Kbps, although some are set higher,
at 160 or 192 Kbps. Higher bitrates will result in larger MP3 file sizes, with better
audio quality. For WMA, it is touted that audio tracks encoded with half an MP3
file's bitrate can offer similar audio quality. As such, 64 Kbps WMA files are quite
common.
Use Creative PlayCenter, Creative MediaSource or a number of third party
applications (not bundled) to extract audio tracks and encode MP3s or WMAs.
When creating unprotected WMA files, ensure that the digital rights management
function is disabled. For example, in Windows Media Player, under Options, click
the
CD Audio
tab, and then click the
Enable Personal Rights Management
check box to deselect it.
Содержание 51MF5045AA000 - Travelsound 250 Speaker System
Страница 1: ......
Страница 3: ...Contents...
Страница 8: ...Introduction...
Страница 11: ...1 About Creative TravelSound MP3...
Страница 20: ...2 Setting Up Creative TravelSound MP3...
Страница 24: ...3 Installing Creative TravelSound MP3...
Страница 31: ...4 Transferring Files...
Страница 34: ...5 Using Creative TravelSound MP3...
Страница 41: ...Appendixes...
Страница 42: ...A Technical Specifications...
Страница 44: ...B FAQs and Troubleshooting...
Страница 51: ...C Note on USB Compatibility...
Страница 53: ...D An MP3 and WMA Primer...
Страница 57: ...E Precautions...
Страница 61: ......