Synaccess-networks NP-0801DTM Manuel d'utilisateur télécharger pdf (Page 316)

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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:

)(

−−

⋅+⋅⋅+

zbzb

zazaa

FFF



)(

−−

⋅+⋅⋅+

zbzb

zazaa

SSS



‐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

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Synaccess-networks NP-0801DTM Manuel d'utilisateur Page 316

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