Question
Download Solution PDFWhich of the following is a result of over-modulation?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFIn AM modulation, the modulation index 'or' modulation depth (m) is defined as a measure of the extent to which a carrier voltage is varied by the modulating signal.
It is one of the key parameters whose value determines if there is a distortion in the AM signal or not.
It is evaluated mathematically as:
For three different values of modulation index, we have different output waveforms as:
Under Modulation (μ < 1):
Critical Modulation (μ = 1):
Over Modulation (μ > 1):
Observation:
- As the value of the modulation index increases, the carrier experiences a 180° phase reversal, which causes additional sidebands, and hence, the wave gets distorted.
- Such an overmodulated wave causes interference, which cannot be eliminated.
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