AVT MAGIC AC1 XIP/XIP RM, Руководство по аппаратному и программному обеспечению

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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 co-
dec 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 (64-kbit/s) are used for
an MPEG connection.
TIP
Since some codecs only allow the same parameters in transmit and receive di-
rection, this setting should be always enabled to guarantee maximum com-
patibility.
This setting only refers to incoming calls. If you establish a connection yours-
elf, you can select different parameters for Encoder and Decoder if the called
end support 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.