Specifications

Chapter 17 – Audio Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 218
17.10 AT^SNFD Set Audio Parameters to
Manufacturer Default Values
Description: AT^SNFD sets the active audio parameters to manufacturer defined default values.
The restored values are:
AT^SNFA: <atten>
AT^SNFI: <inBbcGain>, <inCalibrate>
AT^SNFO: <outBbcGain>, <outCalibrate>[0 to 4], <sideTone>
AT^SAIC: <io>, <mic>, <ep>
AT^SNFS: <audMode>
Test Command Syntax: AT^SNFD=?
Response: OK
Exec Command Syntax: AT^SNFD
Response: OK
Note:
Remember that the factory set audio mode 1 is fixed to <outStep>=4. Consequently, AT^SNFD restores
<audMode> together with <outStep>=4, but does not affect the values of <outStep> currently selected in audio
modes 2 - 6. This means, if <audMode>=1, the read commands AT^SNFO, AT^SNFV and AT+CLVL will always
deliver <outStep>=4. In all other modes the <outStep> value is retained until explicitly changed.
17.11 AT^SNFI Set Microphone Path Parameters
Description: 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.
Test Command Syntax: AT^SNFI=?
Response: ^SNFI: (list of supported <inBbcGain>s) , (list of supported <inCalibrate>s)
OK
Read Command Syntax: AT^SNFI?
Response: ^SNFI: <inBbcGain>, <inCalibrate>
OK
Write Command Syntax: AT^SNFI=<inBbcGain>, <inCalibrate>
Response: OK
Parameter Descriptions:
<inBbcGain>
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
<inCalibrate>
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 <inCalibrate>=
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!