APT WorldCast Equinox - Page 84

WorldCast Equinox - Release 3.1 - user manual – 07/2011
Page 84
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Available options using X.21 / IP network
* Low delay modes when analogue interface selected
Note: No MPEG Layer 3 operation at 384kbps
Use the and keys to highlight the chosen bitrate and mode and press Ent.
Note: It is not possible to use Enhanced apt-X
®
3.5kHz Stereo on a digital audio interface
making ISDN connections using apt-X
®
. This is not the case for Enhanced apt-X
®
.
Note: In some instances G.722 connections may take some time to achieve frame alignment – this is
not a fault with the unit.
5.8.1.1 Choosing your algorithm
To assist in choosing which algorithm is right for your application, please refer to the table
Also note that some IP overhead is required on top of the bit rate. Please see IP Bit rate calcu-
lator for details.
Also note that any statements in this table have not been verified.
Algorithm
Audio
Bandwidth
Algorithm
Delay
IP Bit rate
Recommended Application
Eapt-X
16 / 24 bit
1.9ms (using
Eapt-X24
576kbs)
64 to 384
(Eapt-X16),
576 (Eapt-X
24)
High quality audio connections, distribu-
tion and STL. Ideal for low latency links.
Linear (un
compressed)
16 / 20 / 24
bit up to
96kHz
Theoretically
0ms
512kbs to
2.304Mbs
High quality uncompressed audio. Dis-
tribution and STLs.
MPEG L2
Up to 22kHz
34ms (at
192kbs)
64kbs to
384kbs
High quality connections for STL and
Distribution. Most codecs support this
algorithm.
MPEG L3
Up to 15kHz
54ms (at
128kbs)
64kbs to
256kbs
High quality, low bit rate, for remotes,
STLs and distribution.
MPEG L3
VBR
Up to 15kHz
54ms (at
128kbs)
Variable
Minimises file size for storage, good for
compressing Linear stream. Used to
communicate with Barix codecs.
G722
7kHz
4ms
64kbs
Voice Quality. Most other codecs sup-
port this algorithm.
G711
3kHz
~0ms
64kbs
Voice Quality. Most other codecs sup-
port this algorithm. Telephone use.
MPEG 4 AAC
LD
Up to 22kHz
20ms (at
128kbs)
64kbs to
384kbs
High quality low bit rate and half the de-
lay of AAC LC. Also STL and distribu-
tion.
MPEG 2/4
AAC LC
Up to 22kHz
55ms (at
96kbs)
64kbs to
256kbs
High quality low bit rate for remotes. Al-
so STL and distribution.
MPEG 4 AAC
HEv1/v2
Up to 22kHz
129ms (at
56kbs)
24kbs to
64kbs
Radio streaming, good for remote appli-
cations on low bit rates.