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To suit the different types of accessories, the audio interfaces can be configured for different audio
modes. The electrical characteristics of the voiceband part vary with the audio mode. For example,
sending and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can be altered with AT commands (except for mode 1).
Both analog audio interfaces can be used to connect headsets with microphones or speakerphones.
Headsets can be operated in audio mode 3 and speakerphones in audio mode 2. Audio mode 5 to 9 can
be used for direct access to the speech coder without signal pre- or post-processing.
When shipped from the factory, all audio parameters of MTX-65i are set to interface 1 and audio mode 1.
This is the default configuration optimized for the Votronic HH-SI-30.3/V1.1/0 handset and used for type
approving the MTX Terminals reference configuration. Audio mode 1 has fixed parameters which cannot
be modified. To adjust the settings of the Votronic handset simply change to another audio mode.
Audio mode
1 (not
AT^SNFS=
adjust)
Default
Name
Handset
DSB with
Purpose
Votronic
handset
Gain:
Fix (dB)
npgaStep
53 (27.25)
adclStep
192 (0)
spkStep
51 (-6)
Power VMIC
ON
Sidetone
ON
Volume ctrl
OFF
Echo cancel
Cancel
Noise reduct1
13dB
MIC I signal
for 0dBm0 @
21mV
1024Hz gain
MTX-Java-IoT | 2018/2
MTX © by MATRIX ELECTRONICA S.L.U.
SUPPORT: iotsupport@mtxm2m.com | SALES: info@mtxm2m.com |
2
3
Basic
Deadset
Handsfree
Car Kit
Headset
Adjust. (dB)
Adjust. (dB)
53 (27.25)
53 (27.25)
192 (0)
192 (0)
51 (-6)
51 (-6)
ON
ON
-
Adjustable
Adjustable
Adjustable
Cancel
Cancel
12dB
12dB
29mV
29mV2
4
5-9
User
Plain
Handset
Codec
Direct
DSB with
access to
individual
speech
handset
coder
Adjust. (dB)
Adjust. (dB)
53 (27.25)
53 (27.25)
192 (0)
192 (0)
51 (-6)
51 (-6)
ON
ON
Adjustable
Adjustable
Adjustablet
Adjustable
Cancel
-
-
-
26mV
35mV
mtxm2m.com
10
Trans
TTY/CTM
device
Adjust. (dB)
53 (27.25)
192 (0)
51 (-6)
ON
Adjustable
Adjustable
-
-
35mV
69
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