Electrical Characteristics Of The Voiceband Part; Setting Audio Parameters By At Commands; Table 30: Audio Parameters Adjustable By At Command - Siemens AC75 Hardware Interface Description

AC75 Hardware Interface Description
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5.7

Electrical Characteristics of the Voiceband Part

5.7.1 Setting Audio Parameters by AT Commands

The audio modes 2 to 6 can be adjusted according to the parameters listed below. Each
audio mode is assigned a separate set of parameters.

Table 30: Audio parameters adjustable by AT command

Parameter Influence to
inBbcGain MICP/MICN analogue amplifier gain of
baseband controller before ADC
inCalibrate Digital attenuation of input signal after
ADC
outBbcGain EPP/EPN analogue output gain of
baseband controller after DAC
outCalibrate[n] Digital attenuation of output signal after
n = 0...4 speech decoder, before summation of
sidetone and DAC
Present for each volume step[n]
sideTone Digital attenuation of sidetone
Is corrected internally by outBbcGain to
obtain a constant sidetone independent
of output volume
Note: The parameters outCalibrate and sideTone accept also values from 32768 to 65535.
These values are internally truncated to 32767.
AC75_HD_V00.202
Range
0...7
0...32767
0...3
0...32767
0...32767
Page 96 of 120
s
Gain range Calculation
0...42dB 6dB steps
-∞...0dB 20 * log (inCalibrate/
32768)
0...-18dB 6dB steps
-∞...+6dB 20 * log (2 *
outCalibrate[n]/
32768)
-∞...0dB 20 * log (sideTone/
32768)
27.04.2006