User's Manual

AC65/AC75 Hardware Interface Description
Confidential / Preliminary
s
AC65/AC75_hd_v00.372 Page 97 of 118 2006-08-03
5.7.2 Audio Programming Model
The audio programming model shows how the signal path can be influenced by varying the
AT command parameters. The parameters inBbcGain and inCalibrate can be set with
AT^SNFI. All the other parameters are adjusted with AT^SNFO.
Figure 41: Audio programming model
<mic>
Microphone
feeding
A
D
Speech
coder
<sideTone>
MIC1
MIC2
A
D
Speech
decoder
TXDDAI
RXDDAI
8Ohms
EP1
EP2
32 Ohms
GSM module
<ep>
VMIC
<io>
<inBbcGain> <inCalibrate>
<outCalibrate [n]>
<outBbcGain>
AT parameters are given in brackets <...>
and marked red and italic.