In amplitude modulation, the modulation index m, is kept...

In amplitude modulation, the modulation index $m$, is kept less than or equal to 1 because INCERT Exemplar] (a) $m>1$ will result in interference between carrier frequency and message frequency, resulting into distortion (b) $m>1$ will result in overlapping of both side bands resulting into loss of information (c) $m>1$ will result in change in phase between carrier signal and message signal (d) $m>$ Iindicates amplitude of message signal greater than amplitude of carriet signal resulting into distortion

In amplitude modulation, the modulation index $m$, is kept less than or equal to 1 because INCERT Exemplar]
(a) $m>1$ will result in interference between carrier frequency and message frequency, resulting into distortion
(b) $m>1$ will result in overlapping of both side bands resulting into loss of information
(c) $m>1$ will result in change in phase between carrier signal and message signal
(d) $m>$ Iindicates amplitude of message signal greater than amplitude of carriet signal resulting into distortion

Key Concepts

Amplitude Modulation

Amplitude modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In AM, the amplitude (or strength) of the carrier wave is varied in proportion to the message signal while the frequency remains constant. This method is fundamental in radio broadcasting and involves generating sidebands, which are the frequencies created by the modulation process that contain the actual information.

Modulation Index

The modulation index in amplitude modulation is a measure of the extent of the modulation applied to the carrier wave. It is defined as the ratio of the amplitude of the message signal to the amplitude of the carrier signal. This parameter is crucial because it determines the quality of the demodulated signal; keeping the modulation index at or below one ensures that the modulation remains within a linear region, preserving the integrity of the transmitted signal.

Overmodulation

Overmodulation occurs when the modulation index exceeds one, meaning the amplitude of the message signal becomes greater than the amplitude of the carrier signal. This results in distortion because the envelope of the AM signal no longer accurately represents the message signal, leading to clipping and the generation of unwanted artifacts that interfere with proper signal recovery at the receiver.

Envelope Distortion

Envelope distortion refers to the deformation of the amplitude envelope of an AM signal, which carries the information content. In an ideal AM system, the envelope should mimic the shape of the original message signal. However, when overmodulation occurs, the envelope becomes distorted, causing difficulties in accurately demodulating the signal and resulting in the loss or corruption of information.

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