![]() ![]() ![]() Turns out, adding in the frequency domain looks like multiplication in the time domain, so we actually want to multiply the two signals together. You’d think that mixing two signals would be adding them together. These are all real numbers - we’ll get to complex numbers in a later part of the series. There are two sine waves and we mix them together to get a sine wave that would decompose into the sum and their difference of the inputs. This is what the final spreadsheet looks like. Along the way, we’ll see a neat spreadsheet trick I should probably use more often. Most of these examples will work on any spreadsheet, but at least everyone can share a Google Sheets document. Since it is ubiquitous, I’ll use Google Sheets. In this installment of the DSP Spreadsheet series, I’m going to talk about two simple yet fundamental things you’ll need to create mathematical models of signals: generating signals and mixing them. That’s exactly what they’re made for - performing simple but repetative math and helping make sense of the results. You might think that spreadsheets aren’t built for doing frequency calculation and visualization but you’re wrong. Sometimes it is clearer to build math models in a spreadsheet. ![]() But these all have some learning curve and often use clever tricks, abstractions, or library calls to obscure what’s really happening. #DSP SPECTRUM TOOL SOFTWARE#Circuit simulation and software workbooks like Matlab and Jupyter are great for being able to build things without a lot of overhead. ![]()
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