What is one way that voice is transmitted in a pulse-width modulation system?

Get ready for the FCC General Radiotelephone Operator License (GROL) exam. Study with flashcards and multiple choice questions, each with hints and detailed explanations. Prepare effectively for your licensing test!

In pulse-width modulation, the information is carried by how long each pulse stays high within a fixed cycle, not by changing the pulse height. The amplitude of every pulse stays the same, but its width varies in direct proportion to the voice signal at that instant. When the voice signal is higher, the pulse remains high longer; when the voice is lower, the pulse is shorter. This changing duty cycle encodes the instantaneous amplitude of the audio you want to reproduce. The carrier frequency (the rate of pulses) is usually kept constant, and filtering the PWM signal can recover the original analog voice waveform. The other ideas describe different modulation schemes (varying pulse height, shifting pulse position, or changing how many pulses occur per second) and aren’t how PWM conveys the voice.