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”.
MPEG-H
MPEG-H 3D Audio is a new audio technology to truly immerse and
envelop listeners in sound from all directions, which opens an entire next
level of sound going beyond stereo and surround. With sound coming
from above, a third dimension is added to the audio experience making it
much more realistic and natural.
Thanks to its unique personalization features, MPEG-H 3D Audio also
offers users a great flexibility to actively engage with the content and adapt
it to their own preferences.
MPEG-H 3D Audio enables true object based sound and is also the basis
of Sony’s 360 Reality Audio for immersive music streaming services. 360
Reality Audio makes it possible for artists and creators to produce music
by mapping sound sources such as vocals, chorus and instruments with
positional information and placing them within a spherical space.
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.
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