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This dataset contains the synthetic stimuli used in the study published in the paper "A Comparative Study of 3D and 1D Acoustic Simulations of the Higher Frequencies of Speech". The goal of this study was to evaluate the accuracy of the acoustic wave propagation in the vocal tract in a source-filter synthesis paradigm with two perceptual experiments. The high frequencies (above 4 kHz) of the stimuli were generated by three different methods: a source-filter method relying on a 1D and a 3D acoustic model, and a bandwith extension algorithm with no physical basis. The low frequency portion was generated with a 3D acoustic model in each case. The data and code used to generate the stimuli are provided in this dataset.