Multitech MTCBA-C-IP-N1 Especificaciones descargar pdf (Pagina 218)

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)

Read Command Syntax: AT^SNFI?

Response: ^SNFI: <inBbcGain>, <inCalibrate>

Write Command Syntax: AT^SNFI=<inBbcGain>, <inCalibrate>

Response: OK

Parameter Descriptions:

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 <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!

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