What is Negative Frequency?

Explains the concept of negative frequency that is often plotted in Fourier Transforms. One point to note is that I have used "j" for the complex variable, instead of "i" (which is more commonly used). This is because I am an electrical engineer, and we use "i" for electrical current, so we use "j" for the complex variable to avoid confusing ourselves (... except then of course it can be confusing for physicists and mathematicians! ... sorry about that, but it is just the way it is.) If you would like to support me to make these videos, you can join the Channel Membership, by hitting the "Join" button below the video, and making a contribution to support the cost of a coffee a month. It would be very much appreciated. Or by clicking here:    / @iain_explains   Check out my search for signals in everyday life, by following my social media feeds: Facebook: https://www.facebook.com/profile.php?... Instagram:   / iainexplains   Related videos: (see: http://www.iaincollings.com) • How do complex numbers relate to real signals?:    • How do Complex Numbers relate to Real Sign...   • Visualising Complex Numbers with an Example    • Visualising Complex Numbers with an Example   • Why are Complex Numbers written with Exponentials?    • Why are Complex Numbers written with Expon...   • Fourier Transform Equation Explained    • Fourier Transform Equation Explained ("Bes...   • Fourier Transform of the cos function:    • Fourier Transform of Cos   For a full list of Videos and Summary Sheets, goto: http://www.iaincollings.com .