Amplitude modulations for modulation indices: 50% (under modulated), 100% and 150% (over modulated). In the figure, the carrier wave frequency is 10 times the modulation signal frequency.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>
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<span class="int-own-work" lang="en">Own work</span> translation, based on <a href="//commons.wikimedia.org/wiki/File:Amplitude_Modulated_Wave-hm-64.svg" title="File:Amplitude Modulated Wave-hm-64.svg">File:Amplitude Modulated Wave-hm-64.svg</a> by <a href="//commons.wikimedia.org/wiki/User:The.ever.kid" title="User:The.ever.kid">The.ever.kid</a>