Specifications

AUDIOCOMMANDS
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317 HSPA+ATCommandsReferenceGuide
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ParametersandValues
<aFn>,<bFn>,<aSn>,<bSn> 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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DownlinkBiquadFilters#BIQUADOUTEX
Setcommandallowstoconfiguretheparametersofthetwoextended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:
#BIQUADOUTEX:<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#BIQUADOUTEX=<aF0>[,<aF1>[,<aF2>[,<bF1>[,<bF2>[,<aS0>[,<aS1>
[,<aS2>[,<bS1>[,<bS2>]]]]]]]]]
Set
AT#BIQUADOUTEX? Read
AT#BIQUADOUTEX=? Test
ParametersandValues
<aFn>,<bFn>,<aSn>,<bSn> 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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.