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040 7448 329657 (04.97) PC-SW 4.5
C H A P T E R 3 : O P E R A T I O N W I T H A P C
3.3.5
AUDIO Panel
The AUDIO panel controls all functions related to audio such as level settings,
interface selection and so on. The individual elements and their functions are
described in detail in the following.
3.3.5.1
QUALITY: Selecting the audio transmission standard
With the QUALITY slide selector you can choose the algorithm for the audio
encoding. The modes and bandwidths shown below can be selected
Note
The setting applies to the transmit signal, i.e. the audio signal
that the remote end receives. To improve the quality of the si-
gnal received locally, the remote end must change the settings
in the AUDIO panel.
The settings can be made independently for each direction.
Setting
Meaning
A-LAW 56 kbit/s
ITU-T G.711 with a bandwidth of 3.1 kHz and a transmission rate of 56 kbit/s
using the a-Law characteristic for Europe.
U-LAW 56 kbit/s
ITU-T G.711 with a bandwidth of 3.1 kHz and a transmission rate of 56 kbit/s
using the
µ
-Law characteristic for North America and Asia
G.722 M2 56 kbit/s ITU-T G.722 – Mode 2 – with a bandwidth of 7 kHz and a transmission rate of
56 kbit/s.
G.722 M3 48 kbit/s ITU-T G.722 – Mode 3 – with a bandwidth of 7 kHz and a transmission rate of
48 kbit/s.
G.728/GSM
16 kbit/s
a
a
For the old version of the interface unit (ID no. 229500), GSM 16 kbit/s is displayed here.
This is a mode that can only be used for transmission between Philips equipment. This
mode transmits with a bandwidth of 3.1 kHz and a transmission rate of 16 kbit/s.
ITU-T G.728 with a bandwidth of 3.1 kHz and a transmission rate of 16 kbit/s.
In a connection with a codec equipped with an old interface unit (ID no. 229500)
the GSM mode is automatically used (see table footnote).
AUDIO OFF
In this setting, no data rate is reserved for the audio signal
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