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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Modulation index</span></span>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p>The <b>modulation index</b> (or <b>modulation depth</b>) of a <a href="Modulation" class="mw-redirect" title="Modulation">modulation</a> 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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<ul><li><a href="Amplitude_modulation#Modulation_index" title="Amplitude modulation">Amplitude modulation index</a></li>
<li><a href="Frequency_modulation#Modulation_index" title="Frequency modulation">Frequency modulation index</a></li>
<li><a href="Phase_modulation#Modulation_index" title="Phase modulation">Phase modulation index</a></li></ul>
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