Siemens Brodersen MC55 AT - Manual (Page 412)

MC55_ATC_V04.00 Page 412 of 475 3/17/06
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17.11 AT^SNFI Set microphone path parameters
AT^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 MUX1 MUX2 MUX3 Charge  Last
SIEMENS ! % % % % % ! ! !
<inBbcGain>
(num)(^SNFW)
<inCalibrate>
(num)(^SNFW)