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MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a
Page 82 of 90
12.08.2002
6.5.2 Audio programming model
The audio programming model shows how the signal path can be influenced by varying the
AT command parameters. The model is the same for all three interfaces, except for the
parameters <outBbcGain> and <inBbcGain> which cannot be modified on the digital audio
interface is being used, since in this case the DAC is switched off.
The parameters inBbcGain and inCalibrate can be set with AT^SNFI. All the other
parameters are adjusted with AT^SNFO.
A
D
A
D
-
¥
...0dB
speechcoder
(0dB; -6db, -
12dB; -18dB)
+0..42dB in
6dB-steps
1k
1k
1k
1k
2,65V
10uF
+
sideTone
AT parameter
outCalibrate[n]
n = 0...4
inCalibrate
inBbcGain
outBbcGain
speechdecoder
MIC2
Figure 40: AT audio programming model