Audio Parameter Characteristic - SimCom SIM5320AL User Manual

Note: SIM5320 has integrated MIC bias circuit. There is no need to pull the MIC1P and MIC1N up to the external power,
just connect it to microphone. MIC1P and MIC1N must be differential lines.
3.4.3

Audio Parameter Characteristic

Main audio parameters can be changed to satisfy users' requirement. Here primary register parameters and
related description are listed. User can adjust them through AT command. For more detail please refers to
Audio Application Document.
Table 13: Audio parameter
Parameter Influence to
MICP/MICN
micAmp1 analogue
gain before ADC
Digital gain of input
txVol
signal after ADC
Digital gain of input
signal
txGain
summation
sidetone
Input PCM 13-tap
txFilter filter parameters, 7
values
Digital
rxGain
output signal after
SIM5320AL_User Manual_V1.01
Figure 23: Microphone interface configuration
Range
amplifier 0...1
0,
1...65535
after 0,
of 1...65535
0...65535
gain of 0,
1...65535
Smart Machine Smart Decision
Gain range Calculation
0...24dB 2 steps
20
Mute,
(txVol/
-84...+12dB
16384)
20
Mute,
(txGain/
-84...+12dB
16384)
MATLAB
---
calculate
Mute, 20
-84...+12dB (rxGain/
34
AT command
AT+CMICAMP1
* log
AT+CTXVOL
* log
AT+CTXGAIN
AT+CTXFTR
* log
AT+CRXGAIN
2014-08-20