Siemens Brodersen MC55 AT - Manual (Page 409)

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 is identical with of
AT^SNFI
.
Formula used to calculate microphone attenuation (negative gain):
Gain in dB = 20 * log( /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 of
AT^SNFI
is identical with of
AT^SNFA
.
• To make the changes persistent use
AT^SNFW
.
Test Command
AT^SNFA=?
Response(s)
^SNFA:
(list of supported s)
OK
Read Command
AT^SNFA?
Response(s)
^SNFA:
OK
Write Command
AT^SNFA=
Response(s)
OK
ERROR
CME ERROR:
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
SIEMENS ! % % % % % ! ! !
(num)(^SNFW)