User guide

AUDIO COMMANDS
207 AT Commands for EV-DO-EV3 Modems
Syntax
Command Command type
AT#PCMRXG=<RX_VOL> Set
AT#PCMRXG? Read
AT#PCMRXG=? Test
Parameters and Values
<TX_VOL> PCM RX volume in RX path.
-5000(-50dB) – 1200(+12dB) A RX_VOL is 1/100 dB step.
-50dB is mute.
Handsfree RX AGC Value Tuning #SHFAGCRX
C2 models only.
Set command sets the handsfree RX AGC value tuning.
Read command returns the current handsfree RX AGC values, in the format:
#SHFAGCRX: <agc_static_gain>,<agc_aig>,<agc_exp_thres>,
<agc_exp_slope>,<agc_compr_thres>,<agc_compr_slope>
Test command reports the supported range of values for
<agc_static_gain>,<agc_aig>,<agc_exp_thres>,<agc_exp_slope>,<agc_compr_thres>,<agc_compr_slope>.
Syntax
Command Command type
AT#SHFAGCRX=<agc_static_gain>,<agc_aig>,<agc_exp_thres>,
<agc_exp_slope>,<agc_compr_thres>,<agc_compr_slope>
Set
AT#SHFAGCRX? Read
AT#SHFAGCRX=? Test
Parameters and Values
<agc_static_gain> Precompressor static gain. This is the gain applied to input samples when
static gain is enabled. Meaningful Range is 0x2000 to 0xFFFF.
Value(agc_static_gain) = 8192
∗
10^(X/20) : X range is 0 to 18 dB.
<agc_aig> Precompressor gain selection flag. Write 0xFFFF to enable adaptive gain
(static gain disabled). Write 0x0000 to enable static gain (adaptive gain
disabled). Meaningful value is just 0x0000 or 0xFFFF.
<agc_exp_thres> Expansion threshold. This is the input energy threshold under which
expansion is applied. This parameter must be less than agc_compr_thres.
Meaningful range is 0x0 to 0x2580. Write 0 to disable the expander.
Value(agc_exp_thres) = 128
∗
(X+75) : X range is -75 to 0 dBm0mu.
<agc_exp_slope> Expansion slope. This is the expander gain slope when expansion is applied.
Meaningful range is 0xFF01 to 0xFFF6.
Value(agc_exp_slope) = 256 * X : X range is -0.04 to -0.996.