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(a)
146040.fig.0011b
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146040.fig.0011c
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146040.fig.0011d
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Figure 11: Results of the proposed algorithm in the environment of high speed driving on highway: (a) noisy speech signal at SNR −8 dB, (b) speech obtained manually by applying noise reduction [19] to (a) signal, (c) the proposed feature, and (d) edge detection filter output based on the proposed feature.