Specifications

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AUDIOCOMMANDS
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HSPA+ATCommandsReferenceGuide 316
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ParametersandValues
<char> 

<aFn>,<bFn>,<aSn>,<bSn>‐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

‐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above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.
CascadedFilters#BIQUADOUT
Setcommandallowstoconfiguretheparametersofthetwocascadeddigitalbiquadfilters
)()( zHzH
SecondFirst
⋅

inDownlinkpath(receiving).Itisnotallo wedifactiveaudioprofileis0.
Readcommandreturnstheparametersfortheactiveprofileintheformat:
#BIQUADOUT:<aF0>,<aF1>,<aF2>,<bF1>,<bF2>,<aS0>,<aS1>,<S2 >,<bS1>,<bS2>
Itisnotallowedifactiveaudioprofileis0.
Testcommandreturnsthesupportedrangeofvaluesfor<aF0>,<aF1>,<aF2>,<b
F1>,<bF2>,<aS0>,<aS1>,<aS2>,
<bS1>,<bS2>
Syntax
Command Commandtype
AT#BIQUADOUT=<aF0>[,<aF1>[,<aF2>[,<bF1>[,<bF2>[,<aS0>[,<aS1>[,<aS2>
[,<bS1>[,<bS2>]]]]]]]]]
Set
AT#BIQUADOUT? Read
AT#BIQUADOUT=? Test