Siemens TC35i Manuel d'utilisateur télécharger pdf (Page 33)

TC35i Terminal Hardware Interface Description

Confidential / Released

TC35i_T_HD_v01.05 Page 33/37 10.07.2003

Audio Modes:

The electrical characteristics of the voiceband part depend on the current audio mode

selected by the AT command AT^SNFS. See Table 6: Audio modes.

The audio modes 4 and 5 can be adjusted by parameters. Each audio mode is assigned a

separate parameter set.

Table 15: AT adjustable parameters

Parameter Influence to Range Gain range Calculation

inBbcGain MICP/MICN analogue amplifier

gain of baseband controller before

ADC

0...7 0...42dB 6dB steps

inCalibrate digital attenuation of input signal

after ADC

0...32767 -"...0dB 20 * log

(inCalibrate/

32768)

outBbcGain EPP/EPN analogue output gain of

baseband controller after DAC

0...3 0...-18dB 6dB steps

outCalibrate[n]

n = 0...4

digital attenuation of output signal

after speech decoder, before

summation of sidetone and DAC

present for each volume step[n]

0...32767 -"...+6dB 20 * log (2 *

outCalibrate[n]/

32768)

sideTone digital attenuation of sidetone

is corrected internally by

outBbcGain to obtain a constant

sidetone independently to output

volume

0...32767 -"...0dB 20 * log

(sideTone/

32768)

Note: The parameters inCalibrate, outCalibrate and sideTone accept also values from 32768

to 65535. These values are internally truncated to 32767.

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Siemens TC35i Manuel d'utilisateur Page 33