What is MP3 Audio?
MP3 is an abbreviation for Motion
Pictures Experts
Group Layer-3. It was originally developed for high quality digital
film
audio soundtracks, but was soon adapted by the market as a quality
method
to compress all types of audio. Today it has become the most popular
standard of audio compression on the Internet. In the high quality
compression
mode, MP3 compresses PCM audio by 11 times with very little perceived
loss
of audio quality. You can store around 11 hours of music or 160 stereo
audio tracks on a single 650MB CD-Rom when using this compression rate.
A regular Audio CD which has non-compressed Digital PCM encoding
provides
74 Minutes of audio on the 650MB CD. MP3 is the ideal format to
download audio from Internet web-sites, a typical MP3 audio track size
is around
4MB (ie 1MB=1minute).
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MP3 PORTABLE PLAYERS
Several small portable
pocket size players are available.
MP3 files are either downloaded from the internet and transferred into
the player memory, or audio CD's are ripped by widely available
software and the CD audio converted to the compressed MP3 audio
format. Below are two popular MP3 players in the
UK.
THE THOMSON LYRA
Shown here is a portable MP3
Player from Thomson called the "Lyra". It retails in the UK at around
£150. Several manufactures also sell small portable MP3 players
in this growing market.
THE SAMSUNG YEEP
The Yepp MP3 64MB player
from Samsung retails at around
£200 in the UK shops. The features are as follows:
+ 16 character LC display
+ Song/artist information
+ Voice recording
+ Parallel PC interface
+ 20Hz-20KHz
+ Multi-format storage space
Compression rates vs a
standard CD:
| Format |
Data rate |
Sample
frequency |
Data
size/ minute |
Typ.
Four minute |
| MP3
(High) |
128Kbps |
44100HZ |
0.96MB/Min |
3.84MB |
| MP3 (Mid) |
64Kbps |
22050HZ |
0.48MB/Min |
1.92MB |
| CD (PCM) |
1413Kbps |
44100HZ |
10.6MB/Min |
42.4MB |
Note: PCM
stands for "Pulse Code Modulation"
which is uncompressed digital audio.
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