Some applications of Fourier's great discovery for beginners

摘要: Nearly two centuries ago, Fourier discovered that any periodic function of period T can be presented as a sum sine waveforms frequencies equal to an integer times the fundamental frequency ω = 2π/T (Fourier's series). It is impossible overestimate importance Fourier's discovery, and all physics or engineering students should familiar with this subject. A suitable device for demonstrating spectra electrical signals digital storage oscilloscope. Spectra various AM FM are demonstrated, well from broadcasting station. Changes in filtered by frequency-selective circuits seen comparing input output voltages. All experiments undergraduate laboratories usable classroom demonstrations.