94 Electrical and Computer Engineering Frequency Spectrum - Audio f (Hz) 0 20k10k Human Auditory System 20Hz-20kHz f (Hz) 0 20k10k FM Radio Signals 100Hz-12kHz f (Hz) 0 20k10k AM Radio Signals 100Hz-5kHz f (Hz) 0 20k10k Telephone Speech 300Hz-3.5kHz