Скачать или смотреть Modulation Index | Modulation index of amplitude modulation | Communication systems

Discussion in this video:
What is modulation index ?
Why modulation index of amplitude modulation is to be less than or equal to one.

Timestamps:
0:00 Video starts
0:16 What is modulation index in am
02:39 example with modulation index less than one
06:23 example with modulation index more than one

Modulation index with two example problems are discussed for clear understanding of why modulation index should be less than one. where M, and A, are the modulation amplitude and carrier amplitude, respectively; the modulation amplitude is the peak (positive or negative) change in the RF amplitude from its unmodulated value. Modulation index is normally expressed as a percentage, and may be displayed on a meter connected to an AM transmitter.

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied as in frequency modulation, or its phase, as in phase modulation.

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