TC65 Terminal Hardware Interface Description
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TC65 Terminal_HD_V02.000b Page 56 of 65 19.02.2007
5.6.1 Audio Parameters Adjustable by AT Commands
Table 32: Audio Parameters Adjustable by AT Commands
Parameter Influence to Range Gain range Calculation
inBbcGain MICP/MICN analog 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 analog 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, but these values are internally truncated to 32767.
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