Define depth of modulation as applied to a modulated wave.
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more than 3 weeks ago
Depth of modulation refers to the ratio of the amplitude of the modulating signal to the amplitude of the carrier signal in a modulated wave. It is a measure of how much the amplitude of the carrier signal is varied by the modulating signal. A higher depth of modulation indicates a greater variation in the amplitude of the carrier signal, resulting in a more pronounced modulation effect.
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Google Gemini AI
more than 3 weeks ago
Depth of Modulation
In a modulated wave, the depth of modulation is a measure of the degree to which the carrier wave's amplitude, frequency, or phase is varied by the modulating signal.
Mathematical Definition:
For a carrier wave of amplitude A and modulating wave of amplitude m, the depth of modulation (D) is defined as:
``` D = (m / A) x 100% ```
Types of Depth of Modulation:
- Amplitude Modulation (AM): Variation of carrier amplitude by the modulating signal. - Frequency Modulation (FM): Variation of carrier frequency by the modulating signal. - Phase Modulation (PM): Variation of carrier phase by the modulating signal.
Values of Depth of Modulation:
- 0% Depth of Modulation: No modulation, carrier wave is unchanged. - 100% Depth of Modulation: Maximum possible variation in carrier wave. - Overmodulation: Depth of modulation exceeding 100%, resulting in distortion of the modulated wave.
Significance of Depth of Modulation:
- Determines the amount of information encoded in the modulated wave. - Affects the signal-to-noise ratio (SNR) of the modulated wave. - Controls the bandwidth required for transmission. - Higher depth of modulation typically leads to higher SNR and wider bandwidth.