AC75 AT Command Set
18.11 AT^SNFI s
AC75_ATC_V01.002 Page 467 of 569 10/30/06
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18.11 AT^SNFI Set microphone path parametersAT^SNFI controls the microphone path amplification. Read and write options of this command refer to the active
audio mode. The write command works only in audio modes 2 to 6.
Syntax
Parameter Description
ADC gain adjustable in eight 6 dB steps from 0 dB to 42 dB (0=0dB, 7=42dB, 8 steps of 6 dB).
0...7
Multiplication factor for input samples. Formula to calculate the negative gain (attenuation) of the input signal:
Gain in dB = 20 * log (inCalibrate / 32768)
0...32767
Notes
• The range of <inCalibrate> is up to 65535 but will be suppressed to 32767. Values above <inCali-
brate>= 65535 will cause a failure.
• The parameter <inCalibrate> of AT^SNFI is identical with <atten> of AT^SNFA.
• For use after restart, changed values can be stored with AT^SNFW.
• Attention! When you adjust audio parameters avoid exceeding the maximum allowed level. Bear in mind that
exposure to excessive levels of noise can cause physical damage to users!
Test Command
AT^SNFI=?
Response(s)
^SNFI: (list of supported <inBbcGain>s) , (list of supported <inCalibrate>s)
OK
Read Command
AT^SNFI?
Response(s)
^SNFI: <inBbcGain>, <inCalibrate>
OK
Write Command
AT^SNFI=<inBbcGain>, <inCalibrate>
Response(s)
OK
Reference(s) PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4Last
SIEMENS - + + + + + + - + -
<inBbcGain>(num)(^SNFW)
<inCalibrate>(num)(^SNFW)