MTX MTX-3G-JAVA-IoT - 4.9 Analog Audio Interface

MTX-xG-JAVA-IoT Family
www.mtxm2m.com 2017/07 v1.2 Page 65/105
MTX M2M® by MATRIX ELECTRONICA S.L.U
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 no.
AT^SNFS=
1 (Default settings,
not adjust- able)
2
3
4
5-9
10
Name
Default Handset
Basic
Handsfree
Headset
User Handset
Plain Codec
Transparent
Purpose
DSB with Votronic
handset
Car Kit
Headset
DSB with
individual
handset
Direct access
to speech
coder
TTY/CTM
device
Gain setting via AT
Fix
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
command.
Defaults:
inpgaStep
adclStep
spkStep
53 (27.25dB)
192 (0dB)
51 (-6dB)
53 (27.25dB)
192 (0dB)
51 (-6dB)
53 (27.25dB)
192 (0dB)
51 (-6dB)
53 (27.25dB)
192 (0dB)
51 (-6dB)
53 (27.25dB)
192 (0dB)
51 (-6dB)
53 (27.25dB)
192 (0dB)
51 (-6dB)
Power supply VMIC
ON
ON
ON
ON
ON
ON
Sidetone
ON
---
Adjustable
Adjustable
Adjustable
Adjustable
Volume control
OFF
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Echo canceller
Cancellation
Cancellation
Cancellation
Cancellation
--
--
Noise reduction
1
13dB
12dB
12dB
--
--
--
MIC input signal for
0dBm0 @ 1024 Hz
(default gain)
21mV
29mV
29mV
2
26mV
35mV
35mV
EP output signal in mV
rms. @ 0dBm0, 1024
Hz, no load (default
gain) /
@ 3.14 dBm0
330mV
390mV
630mV
420mV
635mV
635mV
Sidetone gain at
default settings
15dB
-96dB
17dB
-20dB
-12dB
-96dB
1. 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 aprox. 12 sec, is attenuated by the noise reduction.
2. Signal for -5dBm0 (due to attenuation of uplink filter at 1kHz)