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=== Audio features ===
[[Feeling|Sentiment]] and [[emotion]] characteristics are prominent in different [[phonetic]] and [[prosodic]] properties contained in audio features.<ref>{{cite journal |last1=Chung-Hsien Wu |last2=Wei-Bin Liang |title=Emotion Recognition of Affective Speech Based on Multiple Classifiers Using Acoustic-Prosodic Information and Semantic Labels |journal=IEEE Transactions on Affective Computing |date=January 2011 |volume=2 |issue=1 |pages=10–21 |doi=10.1109/T-AFFC.2010.16}}</ref> Some of the most important audio features employed in multimodal sentiment analysis are [[mel-frequency cepstrum| mel-frequency cepstrum (MFCC)]], [[spectral centroid]], [[spectral flux]], beat histogram, beat sum, strongest beat, pause duration, and [[pitch accent|pitch]].<ref name="s1" /> [[OpenSMILE]]<ref>{{cite book |last1=Eyben |first1=Florian |last2=Wöllmer |first2=Martin |last3=Schuller |first3=Björn |title=OpenEAR — Introducing the munich open-source emotion and affect recognition toolkit - IEEE Conference Publication |journal= |pages=1 |date=2009 |doi=10.1109/ACII.2009.5349350 |chapter-url=
=== Visual features ===
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