An acoustic contrast control method for generating sound field in an arc-shaped area using a linear loudspeaker array was recently developed, where the boundary of the arc-shaped area was treated as the envelope of the tangent lines that can be formed by manipulating the phase profile of the loudspeaker array. This paper investigates the mechanism, robustness and the time domain performance of the method for reproducing speech signals. First, the mechanism of the method is thoroughly studied and it is found that the method is based on the stationary phase method which usually works well in high frequency region. Second, the robustness of the method to loudspeaker responses and loudspeaker positions is examined. The effects of these factors on the acoustic contrast and acoustic uniformity are demonstrated. Third, the time domain performance of the method is investigated and compared with the traditional acoustic contrast control method. PESQ (Perceptual Evaluation of Speech Quality) criterion is utilized to evaluate the sound quality at different receiving points inside the bright zone based on numerical experiments. Being compared with the traditional acoustic contrast control method, the method proposed in this paper has better time domain performance and is more robust to loudspeaker uncertainties. The proposed method provides a promising technique for sound reproduction in an arc-shaped area.
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