Specifications

AC65/AC75 Hardware Interface Description
5.7 Electrical Characteristics of the Voiceband Part
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AC65_AC75_HD_v01.002 Page 91 of 117 2006-10-30
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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.
Note: The parameters outCalibrate and sideTone accept also values from 32768 to 65535. These values are
internally truncated to 32767.
Table 30: 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
outCalibrate[n]
n = 0...4
Digital attenuation of output signal
after speech decoder, before sum-
mation 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 inde-
pendent of output volume
0...32767 -
∞...0dB 20 * log (sideTone/
32768)