AVT MAGIC AC1, Hardware & Software Manual

Page: 65 / 162

PAGE 65
W i n d o w s P C S o f t w a r e
• With the option Encoder follows Decoder on incoming calls you make
sure that the encoder works with the same settings (such as e.g. Audio cod-
ing algorithm and sampling frequency) as the decoder.
MPEG Mode
Under
MPEG Mode,
you configure the transmission parameters for the
ISO/MPEG Layer III or Layer II (Option) Audio coding algorithm.
•
Algorithm
: Please select the desired coding algorithm
Layer III
or
Layer II
.
We recommend - if possible - to use Layer III, since at data rates of maxi-
mum 128 kbit/s this algorithm provides much better quality as Layer II
does. Layer II should only be selected if the remote side can only decode
Layer II signals.
• 1 B Mode : Under this setting, you can configure the Audio mode ( Stereo ,
Joint Stereo , Dual Channel , Mono ) and the sampling frequency ( 16 kHz ,
24 kHz , 32 kHz , 48 kHz ), if only one B channel (64 kbit/s) is used for an
MPEG connection.
• 2 B Mode : Under this setting, you can configure the Audio mode ( Stereo ,
Joint Stereo , Dual Channel , Mono ) and the sampling frequency
1
( 16
kHz , 24 kHz , 32 kHz , 48 kHz ), if two B channels (128 kbit/s) are used for
an MPEG connection.
TIP
Since some Audio codecs only allow the same parameters in transmit and re-
ceive direction, this setting should be always enabled to guarantee maximum
compatibility.
This setting only refers to incoming calls. If you establish a connection your-
self, you can select different parameters for Encoder and Decoder if the called
end supports this configuration.
NOTE
Layer II is only available, if the fee-based option ISO/MPEG Layer II Upgrade
(order number 450305) is enabled.
1
If Layer II is used, depending on the signalling not all sampling frequencies are available.