简介:Thispaperinvestigatesthepositiverealcontrolproblemforuncertaindescriptorsystems.Theparametricuncertaintyisassumedtobenormbounded.Firstly,forthenominalsystem,anewpositiverealcharacterizationisgiven,whichisexpressedbyastrictlinearmatrixinequality(LMI)withoutequalityconstraints.Secondly,fortheuncertainsystem,necessaryandsufficientconditionsforthesolvabilityofthepositiverealcontrolproblemarederived.Basedontheseconditioosastatefeedbacklawisobtained,whichrenderstheresultantclosed-loopsystemrobustlypositivereal.
简介:Inthispaper,itisprovedthat,given3controlpointsA,BandC,ifthecamera'sopticalcenterOliesononeofthethreeplanesperpendiculartotheplaneABCandgoingthroughoneofthethreealtitudesofthetriangleABC,andadditionallyitsprojectionontheplaneABCiswithinthecircumscribedcircleofthetriangle,thatis,Oiswithintheso-called'dangercylinder',thenthecorrespondingP3Pproblem{O,(ABC)}musthave4positivesolutions.Thisresultispurelygeometrical,andmoreinstructive.Itcanbringsomenewinsightintoabetterunderstandingofmultiple-solutionprobleminthePnPproblem,andcouldbeusedassometheoreticalguidetoarrangecontrolpointsinrealapplications.
简介:一、声卡实物图以及功能芯片分析二、产品简介上海岛谷科技在发布BlackGold(黑金)ⅡValueFine后,再次发布一款力作BlackGoldⅡ5.1Cannon。Cannon仍使用了Crystal公司的CT4630芯片作为声卡的DSP。负责主声道两路输出的Codec是STAC9756T。STAC9756T的DAC信噪比要比ValueFine中使用的STAC9766T高3dB,而ADC信噪比高2dB。负责5.1中另外四个声道的Codec使用CirrusLogic的CS4294-JQ。而ValueFine中用的是CS4298-KQ,两者指标相同,只不过物理尺寸上CS4294-JQ要小不少。声卡使用了极为常见的5颗NE5532运放用于模拟输出,它的品质虽然称不上顶级,并且上市历史过于悠久,但平心而论