Erco & Gener GenPro 20e, Руководство пользователя

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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO&GENER reserves the right to make any modifications.
8.2.2 Audio interface
The audio interface is accessible via the 15-pin Sub HD connector (see chapter
7.7 Audio
).
8.2.2.1 Microphone and Loud-speaker
Table : Characteristics of the audio interface on the 15-pin Sub HD connector
Audio parameters Min. Typ. Max. Units Comments
Microphone input current @ 2V / 2 K Ω 0.5 mA
Absolute microphone input voltage (max.) 100 mV pp AC voltage
Loud-speaker output current (load 150 Ω //
1nF)
16 mA
Absolute loud-speaker impedance 32 50 Ω
Impedance of the loud-speaker amplifier in
differential mode
1 Ω +/- 10%
Table : Characteristics of the internal microphone input filter
Frequency range Gain
0 - 150 Hz < -22 dB
150 - 180 Hz < -11 dB
180 - 200 Hz < -3 dB
200 - 3700 Hz 0 dB
> 4000 Hz < -60 dB
Table : Recommended microphone and loud-speaker characteristics:
Microphone characteristics Value
Type Electret 2 V / 0.5 mA
Impedance Z = 2 k Ω
Sensitivity -40 dB to -50 dB
SNR > 50 dB
Frequency response Compatible with the GSM specifications
Loud-speaker characteristics Value
Type 10mW, electromagnetic
Impedance Z = 32 to 50 Ω
Sensitivity 110 dB SPL min. (0 dB = 20 µPa)
Frequency response Compatible with the GSM specifications