SimCom SIM5218E Hardware Design page 35

SIM5218E Hardware Design
stGain Digital attenuation of
sidetone
rxFilter Output PCM 13-tap filter
parameters, 7 values
NOTE: if you want to better experience on audio, you should modify these parameters for
your own electronic and mechanical design of audio part. The 13-tap filter parameter could
be debugged and calculated by MATLAB.
3.8.5.2 Audio Programming Model
The audio programming model shows how the signal path can be influenced by varying AT
command parameters. Parameters <micAmp>, <txGain> , <txVol>, <txFilter>,<rxGain>,
<stGain> ,<rxVol> and <rxFilter> can be adjusted with corresponding AT commands. For more
information on the AT commands and parameters see Section 3.8.5.1.
NOTE: Please reference document [1] for detailed information of each AT command.
SIM5218E_HD_V1.03
0, 1...65535
0...65535
Figure 19: Audio programming model
34
Mute, 20 * log
-96...0dB (stGain/
16384) -12
--- MATLAB
calculate
AT+CSIDET
AT+CRXFTR
11.06.2009