Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
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XT55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
6.5.2 Audio programming model<br />
The audio programming model shows how the signal path can be influenced by varying the<br />
AT command parameters. The model is the same for all three interfaces, except for the<br />
parameters and which cannot be modified if the digital audio<br />
interface is being used, since in this case the DAC is switched off.<br />
The parameters inBbcGain and inCalibrate can be set with AT^SNFI. All the other<br />
parameters are adjusted with AT^SNFO.<br />
GSM_MIC1<br />
2.65V<br />
<br />
GSM_MIC2<br />
1k<br />
1k<br />
10uF<br />
1k<br />
1k<br />
<br />
+0...42dB in 6dB steps<br />
A<br />
D<br />
<br />
-∞...0dB<br />
Speech coder<br />
GSM_RFSDAI, GSM_RXDDAI<br />
<br />
<br />
<br />
<br />
neg. gain (attenuation)<br />
0dB; -6db, -12dB; -18dB<br />
A<br />
D<br />
+<br />
<br />
n = 0...4<br />
Speech decoder<br />
GSM_TFSDAI, GSM_TXDDAI<br />
AT parameters are given in brackets <br />
and marked red and italic.<br />
Figure 48: AT audio programming model<br />
XT55/56_hd_v02.06a Page 103 of 125 17.12.2004
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