软件无线电实现的收音机，实测音质清晰，IQ数据采集及解调过程如下(RF前端e4000, ADC及USB数据传输rtl2830)

RF front end tune to xxxMHz->acqusition I/Q data(high speed ADC,3.2Msps)->fir_xlating_filter_ccc(decim,lowpassTaps(),center_freq，OriginSampleRate)->decimation I&Q ,DUC/DDC for Fine tune alternative,LowPass to brocast FM band width,-> (I(n)+jQ(n))*(I(n-1)-jQ(n-1))->cos(w1-w0)+jsin(w1-wo)->atan(dw)->dw->dw*SampleRate/deviration(75KHz)/2pi->deltaf->Voice Amplitue(deemphassi option)