Complex Heterodynes Explained

Introduction Some Common DSP Notations Sampling with 1 ADC Creates a Real Signal Heterodyning the Signal to Baseband the Wrong Way Complex Heterodyne to the Rescue Filtering Away the Old Negative Image Decimation Final Block Diagram Conclusion Afterthought: the Fourier Transform is a Bunch of Averaged Complex Heterodynes References Footnotes Introduction In my previous blog post about polyphase…