In this paper, we proposed a method to express emotion in a synthetic speech using musical theories. We define the pitch of each phoneme according to an accent dictionary in the first step. Next, we change the pitch of each phoneme according to a Chord and a Scale which are good for expression emotion in music. In order to evaluate this approach, we did experiments. The experimental results saw the possibility of using Chords and Scales to express emotion in synthetic speech. Future works of our research are as follows. We have to analysis these synthetic speeches and extract the relation between synthetic speeches and emotion using a machine learning techniques. We have to use other musical theories to express emotion appropriately, in synthetic speech. In addition, we have experimented these results with a lot of listeners to evaluate our approach.
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