SimCom SIM5218E Hardware Design page 36

SIM5218E Hardware Design
3.8.5.3 Audio characteristics
The electrical characteristics of the voiceband part depend on the current audio mode (device
number) set with the AT+CSDVC command. All values are noted for default gains.
Table 14 : Audio Characteristics
Audio Device no.
AT+CSDVC=
Name
Purpose
TX-Filters
RX-Filters
Gain setting:
Default micAmp1 0（0 dB）
MIC path
micAmp
Parameters
txGain
txVol
txFilter
[tap0~6]
Default rxGain
Output
rxVol
path
stGain
Parameters rxFilter
[tap0~6]
Power supply VMIC
Sidetone
Volume control
Echo canceller Filter
length Behaviour
optimized for
Non Linear Processor
with Comfort Noise
SIM5218E_HD_V1.03
1
Handset
Defaullt for DSB with
Votronic handset
Adjustable
Adjustable
adjusted to fit artificial
ear type 3.2 low leakage
Adjustable
7（10.5 dB）
23143
16384
0xff33, 0x05d8,
0xf488, 0x0af3,
0x24bb, 0xca42,
0x7c95
11599
-100
2304
0xff00, 0xfac9,
0x0571, 0xf365,
0x0bc2, 0xf2bb,
0x533a
ON during call
Adjustable
Adjustable
ON 16ms low echo
ON
2
Headset
Mono Headset
Adjustable
Adjustable
Adjustable
0（0 dB）
7（10.5 dB）
51811
16384
0,0,0,
0,0,0,0
6523
-100
1024
0,0,0,
0,0,0,0
ON during call
Adjustable
Adjustable
ON 16ms moderate echo
ON
35
3
Speaker phone
handheld speaker-phone
Adjustable
Adjustable
500 Hz HP
Adjustable
0（0 dB）
4（6 dB）
32690
16384
0xfff3, 0x001d,
0xffb9, 0x016b,
0xfa71, 0x0c08,
0x309a
41155
0
0
0xfd3f, 0xfc4f,
0xfb60, 0xfa27,
0xf97c, 0xf920,
0x3934
ON during call
Adjustable
Adjustable
ON 64ms high echo
ON
11.06.2009