MC55_ATC_V04.00 Page 409 of 475 3/17/06
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17.9 AT^SNFA Set or query of microphone attenuation
AT^SNFA specifies the large-scale attenuation on the microphone path of the audio device currently selected
with AT^SNFS. The write command is only available in audio modes 2 to 6.
Syntax
Parameter Description
Multiplication factor for input samples. Parameter <atten> is identical with <inCalibrate> of AT^SNFI.
Formula used to calculate microphone attenuation (negative gain):
Gain in dB = 20 * log(<atten>/32768)
0...32767
(P)
...65535
0 Microphone is muted.
Please note that AT^SNFA cannot be used to mute the microphone. Therefore,
any attempt to enter 0 will be rejected with error response. Value 0 is returned
only by the read command AT^SNFA? after the microphone was muted with
AT^SNFM=0 during an active call.
32767 No attenuation on the microphone path
Values greater than 32767 will be suppressed to 32767.
Notes
• This command is provided for compatibility with former products (e.g. M20) and is a subset of AT^SNFI. The
parameter <inCalibrate> of AT^SNFI is identical with <atten> of AT^SNFA.
• To make the changes persistent use AT^SNFW.
Test Command
AT^SNFA=?
Response(s)
^SNFA: (list of supported <atten>s)
OK
Read Command
AT^SNFA?
Response(s)
^SNFA: <atten>
OK
Write Command
AT^SNFA=<atten>
Response(s)
OK
ERROR
CME ERROR: <err>
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last
SIEMENS ! % % % % % ! ! !
<atten>
(num)(^SNFW)
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