User's Manual

MC46 Hardware Interface Description
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mo b i l e
MC46_HD_V03.05 Page 79 of 99 13.11.2003
5.5.2 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 if 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
Speech coder
0dB; -6db, -12dB; -18dB
+0...42dB in 6dB steps
1k
1k
1k
1k
2.65V
10uF
+
sideTone
A
T parameters
outCalibrate[n]
n = 0...4
inCalibrate
inBbcGain
outBbcGain
Speech decoder
MIC2
Figure 37: AT audio programming model