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Acoustical Pre Processing for Robust Speech Recognition

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Figure

Figure 1 compares averaged spectra from the Alphanumeric database for frames believed to contain speech and background noise from each of the two microphones
Table I. Baseline performance of the Sphinx system when trained and tested on the Alphanumeric vocabulary using each of the two microphones
Figure 2 Comparison of recognition accuracy obtained using the baseline signal processing, spectral subtraction, and spectral normalization, and each of the two microphones

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