What is the name of the type of modulation in which the modulating signal varies the duration of the transmitted pulse?

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!

Multiple Choice

What is the name of the type of modulation in which the modulating signal varies the duration of the transmitted pulse?

Varying the duration of each transmitted pulse is called pulse-width modulation. The modulating signal controls how long each pulse lasts, so information is encoded in the pulse width rather than in how tall the pulse is or where the carrier sits in frequency. The other options change different aspects: amplitude modulation changes the carrier’s height, frequency modulation shifts the carrier frequency, and pulse-height modulation would alter pulse amplitude rather than pulse duration.

Varying the duration of each transmitted pulse is called pulse-width modulation. The modulating signal controls how long each pulse lasts, so information is encoded in the pulse width rather than in how tall the pulse is or where the carrier sits in frequency.

The other options change different aspects: amplitude modulation changes the carrier’s height, frequency modulation shifts the carrier frequency, and pulse-height modulation would alter pulse amplitude rather than pulse duration.

More practice questions