Technical data

12
Options
Optional Audio Codecs
Standard System
The MAGIC AC1 XIP Systems are delivered with the
following coding algorithms by default:
• G.711
- Bit rate: 64-kbit/s
- Bandwidth: 300-Hz... 3,4-kHz
- Delay: < 10 ms
• G.722
- Bit rate: 64-kbit/s
- Bandwidth: 50-Hz... 7-kHz
- Delay: < 10 ms
•ISO/MPEG Layer 2
1
- features see below
• PCM 16, PCM 20, PCM 24
- Bit rate: 1024-kbit/s... 2304-kbit/s
- Bandwidth: 20-Hz... 20-kHz
- Delay: < 10 ms
- lossless coding
- only for IP networks
For compatibility reasons or if required for the appli-
cation, further algorithms can be licensed for each sys-
tem:
ISO/MPEG Layer 2
15-kHz Audio Codec with a delay of
approx. 150 ms. ISO/MPEG Layer 2 is
available in almost every Audio Codec
and therefore, it provides the highest
compatibility for ISDN connections.
In the new Audio over IP standard N/ACIP
TECH3326 ISO/MPEG Layer 2 is mandatory. Interopera-
bility for IP transmissions is guaranteed thanks to this
standard.
ISO/MPEG Layer 3
15-kHz Audio Codec with a delay of
approx. 250 ms. ISO/MPEG Layer 3 is
more efficient than ISO/MPEG Layer 2
and enables a better Audio quality at low
bit rates. The algorithm is also imple-
mented in many Audio Codecs.
In the new Audio over IP standard N/ACIP
TECH3326 ISO/MPEG Layer 3 is optional. Interoperabi-
lity for IP connections is secured because of that stand-
ard.
AAC-LD
15-kHz Audio Codec with a low delay of ca. 50 ms.
The Codec permits a very good quality at low bit rates,
but it is not very widely-used in the available Audio
Codecs. Furthermore, interoperability for ISDN connec-
tions between systems from different manufacturers is
not assured.
In the new Audio over IP standard N/ACIP
TECH3326 AAC-LD is rated as recommended. Interope-
rability for IP connections is guaranteed due to the stand-
ard.
Standard apt-X
15-kHz Audio Codec with a very low delay of less
than 10 ms. However, the Codec requires 128-kbit/s for a
high-quality Mono Audio signal and 256-kbit/s for a
Stereo signal. Via ISDN only a Mono signal with 15-kHz
bandwidth can be transmitted. Moreover, interoperabil-
ity for ISDN connections between systems from different
manufacturers could not be promised.
In the new Audio over IP standard N/ACIP
TECH3326 apt-X is rated as optional. Interoperability for
IP connections is guaranteed due to the standard.
The licences are issued per channel per Encoder or
Decoder, respectively.
Enhanced apt-X
Enhanced apt-X are identical parameters as standard
apt-X, but they have an improved Audio quality because
of a higher dynamic and less delay.
The licences are issued per channel per Encoder or
Decoder, respectively.
1
If required, instead of Layer 2 the Layer 3 algorithm can
also be enabled in the basic system. Please note, that a sys-
tem without ISO/MPEG Layer 2 is no longer compatible
to N/ACIP TECH3326, since ISO/MPEG Layer 2 is rated
as mandatory.
Upgrades for MAGIC AC1 XIP/MAGIC AC1 XIP RM