Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 81 of 92 21.12.2001
6.5.2 Characteristics of audio modes
The electrical characteristics of the voiceband part depend on the current audio mode set
with the AT^SNFS command.
Table 35: Voiceband characteristics (typical), all values preliminary
Audio mode no.
AT^SNFS=
1 (Default
settings, not
adjustable)
2 3 4 5 6
Name Default
Handset
Basic
Handsfree
Headset User
Handset
Plain
Codec 1
Plain
Codec 2
Purpose DSB with
M20T
handset
Siemens Car
Kit Portable
Siemens
Headset
DSB with
individual
handset
Direct
access to
speech
coder
Direct
access to
speech
coder
Gain settting via AT
command. Defaults:
inBbcGain
outBbcGain
Fix
5 (30dB)
1 (-6dB)
Adjustable
1 (6dB)
1 (-6dB)
Adjustable
4 (24dB)
2 (-12dB)
Adjustable
5 (30dB)
1 (-6dB)
Adjustable
0 (0dB)
0 (0dB)
Adjustable
0 (0dB)
0 (0dB)
MICPn/MICNn
EPPn/EPNn
n=1 n=2 n=2 n=1 n=1 n=2
Power supply ON ON ON ON OFF OFF
Sidetone ON --- Adjustable Adjustable Adjustable Adjustable
Volume control OFF Adjustable Adjustable Adjustable Adjustable Adjustable
Limiter (receive) ON ON ON ON --- ---
Compressor
(receive)
--- ON
1)
--- --- --- ---
AGC (send) OFF --- ON --- --- ---
Echo control (send) Suppression Cancellation +
suppression
NO Suppres-
sion
--- ---
Noise suppression
2)
--- up to 10dB 10dB --- --- ---
MIC input signal for
0dBm0 @ 1024 Hz
(default gain)
12.5mV 98mV 11mV @
-3dBm0 due
to AGC
12.5mV 315mV 315mV
EP output signal in
mV rms. @ 0dBm0,
1024 Hz, no load
(default gain);
@ 3.14 dBm0
275mV 120 mV
default @
max volume
270mV
default @
max volume
275 mV
default @
max
volume
880mV
3.7 Vpp
880mV
3.7 Vpp
Sidetone gain at
default settings
27.7dB -# dB Affected by
AGC, 9.3dB
@ 11mV
(MIC)
27.7 dB -2.7dB
@
sideTone
= 8192
3)
-2.7dB
@
sideTone
= 8192
3)
1)
Adaptive, receive volume increases with higher ambient noise level.
2)
In audio modes with noise reduction, the microphone input signal for 0dBm0 shall be measured
with a sine burst signal for a tone duration of 5 seconds and a pause of 2 sec. The sine signal
appears as noise and, after approx. 12 sec, is attenuated by the noise reduction by up to 10dB.
3)
See AT^SNFO command in /1/.