Asymmetry diplophonia

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If the vocal cords become slightly more asymmetric, they may begin to oscillate at different frequencies. Two pitches are created simultaneously – diplophonia. The separate frequencies are perceived as roughness. In this case we would actually hear both huskiness and roughness. The huskiness is from the gap. The concept of roughness brings up the other type of hoarseness: roughness due to vocal cord asymmetry.