MP3 (MPEG Audio Layer-3)
This is an internationally standardized audio data compression scheme,
using the “MPEG-1” video compression standard. It compresses the data
volume to about one eleventh its original size while maintaining sound
quality equivalent to a music CD.
MPEG (Moving Picture Experts Group), MPEG-2, MPEG-4
These are the names for digital compression format standards used for
the encoding of video and audio. Video standards include “MPEG-1
Video”, “MPEG-2 Video”, “MPEG-4 Visual”, “MPEG-4 AVC”. Audio
standards include “MPEG-1 Audio”, “MPEG-2 Audio”, “MPEG-4 AAC”.
WMA (Windows Media Audio)
This is audio compression technology developed by Microsoft
Corporation.
WMA data can be encoded using Windows Media
®
Player. To encode
WMA files, only use applications authorized by Microsoft Corporation. If
you use an unauthorized application, the file may not work properly.
Sampling frequency
Sampling involves taking a reading of a sound wave (analog signal) at
regular intervals and expressing the height of the wave at each reading in
digitized format (producing a digital signal).
The number of readings taken in one second is called the “sampling
frequency”. The larger the value, the closer the reproduced sound is to the
original.
Speaker impedance
This is an AC resistance value, indicated in Ω (Ohms). Greater power can
be obtained when this value is smaller.
Bit rate
This expresses the read amount per 1 second of video/audio data
recorded. A larger number means higher sound quality, but also means a
larger file size.
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