精选优质文档-倾情为你奉上外文文献A DAQ card based mixed signal virtual oscmoscopeAbstract Complex signals find many applications in SONAR, RADAR，Echo Location Systems and for studying the resonant frequencies. Digital Storage Oscilloscopcs(DSO) is used these days for acquisition and display of routine signals. This instrument, found in every measurement laboratory, though potent in displaying simple periodic waveforms like sinusoids fails when frequency-varying time signals are applied, This pro
