The Scientific World Journal / 2014 / Article / Fig 3

Research Article

Voice Activity Detection in Noisy Environments Based on Double-Combined Fourier Transform and Line Fitting

Figure 3

Results of endpoint detection based on frame energy and employing an edge detection filter in a car-noise environment: (a) noisy speech signal at SNR −5 dB, (b) clean speech signal, (c) frame energy of signal (a), and (d) detection output of edge filter with state transition model ( is lower threshold; is upper threshold).
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(a)
146040.fig.003b
(b)
146040.fig.003c
(c)
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(d)