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3G Listening device

3G Listening device

GSM55

3G Listening device is the most advanced listening unit on the market today. By combining the latest technology, it achieves parameters that are several times higher than all competing products. This difference is mainly present in the sound quality as well as in the battery power of the device.

3G Listening device

3G Listening device

3G Listening device is the most advanced listening unit on the market today. By combining the latest technology, it achieves parameters that are several times higher than all competing products. This difference is mainly present in the sound quality as well as in the battery power of the device.

 

This unit was developed based on the cooperation with sveral technical experts in our field as well as with the forces in the field. We have maximized the sound quality of the unit by using Knowles microphones and 3G network. The 3G listening unit features 2 microphones, one is located on the unit circuit board directly for voice detection and other which is used as an external microphone.

Combination of two microphones resuls in very long battery life, accompanied by excelent quality sound. There are several safety mechanisms, which we have implemented in order to ensure secure yet smart communication.

Key features:

  • Digital preamplifier paired with AGC (automatic gain control) function of the module for better and clearer sound
  • Real-time gain control via DTMF tones
  • Sleep time/ Dead time for extremely long battery life
  • Possibility to select band 2G/3G
  • Smart VOX hanging up protocole
  • Password protected listening (optional)
  • Master number setting

Commands of 3G listening unit

Sleep mode

This mode is usually activated when you need for the device to discretely inactive. What it does essentially is that it will turn itself off, shot down connection to the network and then wake up. If there are command waiting, such as to wake up, it will power on. In case there are no commands waiting it will again shut itself off.

Real-time audio management

By using the DTMF tones, you have several options to set the microphone settings to the optimal mode. The unit is programmed to pick up sound from far distance. Therefore testing it by speaking to the microphone from 1 meter does not make much difference. What does make a difference is the distance in which the microphone can pick up the sound. The sound quality is paired together with the singal reception, therefore if you will not be having a strong signal the sound quality will to be impaired.

Watchdog function

No matter what you do with electronics, there comes a time when somehow the unit jams. For this, we have implemeted a function which eliminates this jamming. When the fault is detected the device will restart itself and after booting it will work again.

NOTE: Device can be made with EXTERNAL or INTERNAL microphone. The battery can be either mounted onto the device or it will be supplied with desired battery, the standard is 3600mAh in the packaging.

GSM55

Specific References

ParameterDescription
Number of microphones 1x MEMS + 1x KNOWLES
Maximum distance from the microphone 9-12 meters
Non-stop operation when connected to an el. sítě networks Yes
Weight 75g
Dimensions 50 x 45 x 12mm
Stand-by 25 days
Duration of automatic activation mode 150 days
Durability during continuous interception 12 to 18 hours
Support for bands All
Consumption in stand-by 3mA
Consumption in VOX

VOX mode: 3mA; SLP mode: 0.5mA

Talk time consumption 100 - 150mA
UMTS Release 99/5 GSM Release/99/4
Supply Voltage Range 3.3V ~ 4.3V, 3.8V typ.
Operation Temperature -40 °C ~ +85 °C
Weight Approx. 4.3g
Control via AT commands 3GPP TS27.007, 27.005 and other
SIM card format Nano
Antenna On board GSM/UMTS antenna
Microphone: Knowles
Selectable audio sensitivity: yes
Noise rejection filters: 2 filters
Frequency range: 300 Hz to 5 kHz
UC15-E 900/[email protected] / 900/[email protected]
UC15-A 850/[email protected] / 850/900/1800/[email protected]
UC15-T 850/[email protected] / 850/900/1800/[email protected]
HSDPA Release 5 (category 6)
EDGE Downlink only
GPRS Multi-slot Class 12

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