Specifications

TC35i AT Command Set
Confidential / Released
TC35i_ATC_V01.05 Page 216 of 278 04.08.2003
7.27 AT^SNFI Set microphone path parameters
Test command
AT^SNFI=?
Response
^SNFI: (list of supported <inBbcGain>s), (list of supported <inCali-
brate>s) OK
Parameters
See write command
Read command
AT^SNFI?
Response
^SNFI: < inBbcGain >, <inCalibrate> OK
Parameters
See write command
Write command
AT^SNFI=<inBbcGain>,
<inCalibrate>
Response
TA sets microphone path amplifying.
OK
Parameters
<inBbcGain> ADC gain adjustable in eight 6 dB steps from 0 dB to
42 dB:
0 - 7 (where 0 = 0 dB and 7 = 42 dB)
<inCalibrate> Multiplication factor for input samples:
0 – 32767
Formula to calculate the negative gain (attenuation) of
the input signal:
Gain in dB = 20 * log (inCalibrate / 32768)
Reference
Siemens
Note
· The read and write commands refer to the active audio mode.
· The write command works only in audio modes 2 to 6.
· The range of <inCalibrate> is up to 65535 but will be suppressed to
32767. Values above <inCalibrate> = 65535 will cause a failure.
· Changed values need to be stored with AT^SNFW for use after re-
start. To restore factory defaults use AT^SNFD.
· Caution: When you adjust the audio parameters avoid exceeding the
maximum allowed level. Bear in mind that exposure to excessive lev-
els of noise can cause physical damage to users.