Siemens TC35i - Manual (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.