User's Manual

PCS3_HD_v01.000
Confidential / Preliminary
Page 73 of 101 2013-10-21
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PCS3 Hardware Interface Description
6.7 Electrical Characteristics of the Voiceband Part
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6.7 Electrical Characteristics of the Voiceband Part
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6.7.1 Setting Audio Parameters by AT Commands
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Audio mode 1 is the basic audio mode optimized for the Votronic reference handset (see Sec-
tion 10.1). The default parameters are determined for type approval and are not adjustable with
AT commands.
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The audio modes 2 to 8 can be temporarily adjusted according to the AT command parameters
listed in the table below. The audio parameters are set with the AT commands AT^SNFI as well
as AT^SNFO and stored volatile for the current audio mode (see [1]). For a model of how the
parameters influence the audio signal path see Section 6.7.2.
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Table 24: Audio parameters adjustable by AT command
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Parameter Influence to Range Gain range Calculation
AT^SNFI=
micAmp1
MICP/MICN second analog ampli-
fier gain of before ADC
0,1 0 or 24dB
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micTxVol Digital gain of input signal after ADC 0,
1...65535
Mute,
-84...+12dB
20 * log (micTxVol/
16384)
AT^SNFO=
cdcRxGain
Analog gain of output signal after
summation of sidetone
0...63 -57...+6dB 1dB steps
rxVol Digital Volume of output signal after
speech decoder, before summation
of sidetone and DAC
0,
1…41
Mute,
-48...+12dB
1.5dB steps
stGain Digital attenuation of sidetone 0,
1...65535
Mute,
-96...0dB
20 * log (stGain/
16384) -12