The modulation index (or modulation depth) of a
modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the ''carrier signal'', with a separate signal called the ''modulation signal'' that typically contains informatio ...
scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme.
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Amplitude modulation index
*frequency modulation#Modulation index, Frequency modulation index
*phase modulation#Modulation index, Phase modulation index
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