Hardware Interface Description - Wireless Data Modules
Hardware Interface Description - Wireless Data Modules
Hardware Interface Description - Wireless Data Modules
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MC55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
5.5.3 Characteristics of audio modes<br />
The electrical characteristics of the voiceband part depend on the current audio mode set<br />
with the AT^SNFS command.<br />
Table 29: Voiceband characteristics (typical)<br />
Audio mode no.<br />
AT^SNFS=<br />
Name<br />
Purpose<br />
Gain setting via AT<br />
command. Defaults:<br />
inBbcGain<br />
outBbcGain<br />
Default audio<br />
interface<br />
1 (Default<br />
settings, not<br />
adjustable)<br />
Default<br />
Handset<br />
DSB with<br />
Votronic<br />
handset<br />
Fix<br />
4 (24dB)<br />
1 (-6dB)<br />
2 3 4 5 6<br />
Basic<br />
Handsfree<br />
Siemens Car<br />
Kit Portable<br />
Adjustable<br />
2 (12dB)<br />
1 (-6dB)<br />
Headset<br />
Siemens<br />
Headset<br />
Adjustable<br />
5 (30dB)<br />
2 (-12dB)<br />
User<br />
Handset<br />
DSB with<br />
individual<br />
handset<br />
Adjustable<br />
4 (24dB)<br />
1 (-6dB)<br />
Plain<br />
Codec 1<br />
Direct<br />
access to<br />
speech<br />
coder<br />
Adjustable<br />
0 (0dB)<br />
0 (0dB)<br />
1 2 2 1 1 2 3)<br />
Plain<br />
Codec 2<br />
Direct<br />
access to<br />
speech<br />
coder<br />
Adjustable<br />
0 (0dB)<br />
0 (0dB)<br />
Power supply ON (2.65V) ON (2.65V) ON (2.65V) ON (2.65V) OFF (GND) OFF (GND)<br />
Sidetone ON --- Adjustable Adjustable Adjustable Adjustable<br />
Volume control OFF Adjustable Adjustable Adjustable Adjustable Adjustable<br />
Limiter (receive) ON ON ON ON --- ---<br />
Compressor<br />
(receive)<br />
--- OFF 1) --- --- --- ---<br />
AGC (send) --- --- ON --- --- ---<br />
Echo control (send) Suppression Cancellation +<br />
suppression<br />
--- Suppression<br />
--- ---<br />
Noise suppression 2) --- up to 10dB 10dB --- --- ---<br />
MIC input signal for<br />
0dBm0 @ 1024 Hz<br />
(default gain)<br />
EP output signal in<br />
mV rms. @ 0dBm0,<br />
1024 Hz, no load<br />
(default gain);<br />
@ 3.14 dBm0<br />
Sidetone gain at<br />
default settings<br />
1)<br />
2)<br />
3)<br />
23mV 58mV 7.5mV @<br />
-3dBm0 due<br />
to AGC<br />
284mV<br />
120mV<br />
default @<br />
max volume<br />
300mV<br />
default @<br />
max volume<br />
22.8dB -∞ dB Affected by<br />
AGC, 13dB<br />
@ 7.5mV<br />
(MIC)<br />
23mV 315mV 315mV<br />
284mV<br />
default @<br />
max<br />
volume<br />
895mV<br />
3.7Vpp<br />
895mV<br />
3.7Vpp<br />
22.8dB -∞ dB -∞ dB<br />
Adaptive, receive volume increases with higher ambient noise level. The compressor can be<br />
activated by loading an application specific audio parameter set (see [9]).<br />
In audio modes with noise reduction, the microphone input signal for 0dBm0 shall be measured<br />
with a sine burst signal for a tone duration of 5 seconds and a pause of 2 sec. The sine signal<br />
appears as noise and, after approx. 12 sec, is attenuated by the noise reduction by up to 10dB.<br />
Audio mode 5 and 6 are identical. With AT^SAIC, you can easily switch mode 5 to the second<br />
interface. Therefore, audio mode 6 is only kept for compatibility to earlier Siemens GSM products.<br />
MC55/56_hd_v02.06 Page 88 of 105 29.10.2004
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