Smart Machine Smart Decision
SIM5320AL_User Manual_V1.01
2014-08-20
34
Figure 23: Microphone interface configuration
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
Range
Gain range
Calculation AT command
micAmp1
MICP/MICN
analogue
amplifier
gain before ADC
0…1
0…24dB
2 steps
AT+CMICAMP1
txVol
Digital gain of input
signal after ADC
0,
1...65535
Mute,
-84...+12dB
20
*
log
(txVol/
16384)
AT+CTXVOL
txGain
Digital gain of input
signal
after
summation
of
sidetone
0,
1...65535
Mute,
-84...+12dB
20
*
log
(txGain/
16384)
AT+CTXGAIN
txFilter
Input PCM 13-tap
filter parameters, 7
values
0...65535
---
MATLAB
calculate
AT+CTXFTR
rxGain
Digital
gain
of
output signal after
0,
1...65535
Mute,
-84...+12dB
20
*
log
(rxGain/
AT+CRXGAIN
Summary of Contents for SIM5320AL
Page 1: ...SIM5320AL_User_Manual...
Page 9: ...Smart Machine Smart Decision SIM5320AL_User Manual_V1 01 2014 08 20 9...
Page 14: ...Smart Machine Smart Decision SIM5320AL_User Manual_V1 01 2014 08 20 14...
Page 15: ...Smart Machine Smart Decision SIM5320AL_User Manual_V1 01 2014 08 20 15 Figure 2 Pin view...
