Siemens TC35i Manuel d'utilisateur télécharger pdf (Page 22)

TC35i Terminal Hardware Interface Description

Confidential / Released

TC35i_T_HD_v01.05 Page 22/37 10.07.2003

3.6.2 Audio interface

The audio interface provides an analog input for a microphone and an analog output for an

earpiece.

· The microphone input and the earpiece output are balanced.

· For electret microphones a supply source is implemented.

· The microphone supply characteristics are optimized for the recommended Votronic

handset. For ordering Information see Chapter 7.

· This handset has been used as the reference handset for type approval. An extra

approval must be obtained for integrating other handsets or amplifiers.

The amplification of sending direction, receiving direction and sidetone depend on the

current audio mode.

EMC immunity complies with the vehicular environment requirements according to

EN 301 489-7.

Figure 6: Audio Western plug (4-pole female)

...0dB

speechcoder

0dB; -6db, -

12dB; -18dB

+0..42dB in

B-

steps

4k7

5.9V

6R8

(sideTone)

( ) AT parameter

(outCalibrate[n])

n = 0...4

(inCalibrate)

(inBbcGain)

(outBbcGain)

speechdecoder

Ri=2k

MICP

MICN

EPP

EPN

Figure 7: Audio block diagram

Pin assignment:

1 MICN (Microphone - )

2 EPN (Earpiece)

3 EPP (Earpiece)

4 MICP

(Microphone +)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 36 37

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Siemens TC35i Manuel d'utilisateur Page 22

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