EGS5 Hardware Interface Description
5.7 Electrical Characteristics of the Voiceband Part
104
EGS5_HD_v02.004
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2012-02-09
Confidential / Released
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.
Note: The parameters outCalibrate and sideTone accept also values from 32768 to 65535.
These values are internally truncated to 32767.
Table 31:
Audio parameters adjustable by AT commands
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
outCali-
brate[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 * outCali-
brate[n]/
32768)
sideTone
Digital attenuation of sidetone
Is corrected internally by outBbc-
Gain to obtain a constant sidetone
independent of output volume
0...32767 -
...0dB
20 * log (sideTone/
32768)
