Specifications

AUDIOCOMMANDS
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315 HSPA+ATCommandsReferenceGuide
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ParametersandValues
<aFn>,<bFn>,<aSn>,<bSn> 
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Theyallarespecificparametersforthecalculationofdigitalbiquadfiltersas
follows:
2
2
1
1
2
2
1
10
21
2
)(
−−
−−
⋅+⋅⋅+
⋅+⋅⋅+
=
zbzb
zazaa
zH
FF
FFF
F

2
2
1
1
2
2
1
10
21
2
)(
−−
−−
⋅+⋅⋅+
⋅+⋅⋅+
=
zbzb
zazaa
zH
SS
SSS
S
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‐32768‐32767‐eachvaluehastobeinterpretedassignedfixedpointnumberin
two’scomplementformatwith15fractionalbitsina16bitword(Q15).
Note:Intheformulaspayattentiontothemultiplier(2)forparameters<aF1>,
<aS1>,<bF1>and<bS1>.
Parameterscanbesavedinnon‐volatilememoryusingAT#PSAVcommandan
d
areavailableforaudioprofiles1,2,3.Foraudioprofile0thevaluesarefixed.
ExtendedUplinkBiquadFilters#BIQUADINEX 
Setcommandallowstoconfiguretheparametersofthetwoextendeddigitalbiquadfilters )()( zHzH
SecondFirst
⋅

inUplinkpath(sending).Itisnotallowedifactiveaudioprofileis0.
Readcommandreturnstheparametersfortheactiveprofileintheformat:
#BIQUADINEX:<aF0>,<aF1>,<aF2>,<bF1>,<bF2>,<aS0>,<aS1>,<aS2>,<bS1>,<bS2>
Note:Itisnotallowedifactiveaudioprofileis0;inthiscaseanERRORisreturned.
Testcommandreturnsthesupportedrangeofvaluesfor<aF0>,<a
F1>,<aF2>,<bF1>,<bF2>,<aS0>,<aS1>,<aS2>,
<bS1>,<bS2>
Syntax
Command Commandtype
AT#BIQUADINEX=<aF0>[,<aF1>[,<aF2>[,<bF1>[,<bF2>[,<aS0>
[,<aS1>[,<aS2>[,<bS1>[,<bS2>]]]]]]]]]
Set
AT#BIQUADINEX? Read
AT#BIQUADINEX=? Test