It is important to be able to determine anger and its degree for dialog management in an interactive speech interface. We investigated the characteristics of a strained rough voice as a conveyer of a speaker's degree of anger. In hot anger speech in Japanese, a rough voice with high glottal tension is observed frequently, and the rate of occurrence of the strained rough voice increases according to the degree of anger. In a typical male speaker's speech sample, amplitude fluctuations observed

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... a strained rough voice were periodic; the frequency was around between 40-80 Hz. The modulation ratio in rage speech was larger than in other emotional states, suggesting the possibility of determining the speaker's anger and its degree by detecting strained rough voice.