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In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.

For amplitude modulation,modulation depth = (a-b)/(a+b),

wherea is the unmodulated carrier amplitude, and

b is the minimum amplitude deviation.

The modulation depth ratio is also referred to as the modulation index.

Q: What is depth of modulation?
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Related answers

In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.

For amplitude modulation,modulation depth = (a-b)/(a+b),

wherea is the unmodulated carrier amplitude, and

b is the minimum amplitude deviation.

The modulation depth ratio is also referred to as the modulation index.

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In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.

For amplitude modulation,modulation depth = (a-b)/(a+b),

wherea is the unmodulated carrier amplitude, and

b is the minimum amplitude deviation.

The modulation depth ratio is also referred to as the modulation index.

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There is no difference.

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The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.

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Modulation index is also called as Modulation depth. The modulation index of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level.

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