外文资料Digitalfilterwhichiswidelyusedistheimportantbasementofthedigitalsignalprocessing.Adaptivefiltercanadjustitscoefficientsautomaticallytominimizethemean-squareerrorbetweenitsoutputandthatofanunknowninput,unnecessarytoknowtheautocorrelationfunctionsofsignalandnoiseinadvance,henceitc