JAIST Repository: Fundamental frequency estimation for noisy speech based on instantaneous amplitude and frequency
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(706) R P !""7 ? $L .0 > , .& > 5 P A S . 4 A !"67 ?
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(752) .
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(754) #8 #:! #8" . #7.
(755) Signal + Noise. F0 estimation using instantaneous amplitude (PHIA). The first stage (Rough F0 estimation). Roughly estimated F0 Time warping to flatten F0. Noise reduction using the comb filter with controllable pass-bands. The second stage (Noise reduction). Time warping to restore F0 Noise-reduced signal F0 estimation using instantaneous frequency. The third stage (Accurate F0 estimation). Estimated F0. * : . #B.
(756) (a) Speech waveform (female /aoi/) 4. 2. x 10. Amplitude. 1 0 -1 -2 0. 100. 200. 300 400 Time [ms]. (b) Instantaneous amplitude obtained using constant Q filterbank. 500. 400 Channel #. Channel #. 700. (c) Instantaneous amplitude obtained using constant bandwidth filterbank. 15 10 5. 300 200 100. 100. 200. 300 400 Time [ms]. 500. 600. 0. (d) F0 distributions from periodicity. 600. 500. 500. 400 300 200 100 0. 100. 200. 300 400 Time [ms]. 500. 600. (e) F0 distributions from harmonicity. 600 Frequency [Hz]. Frequency [Hz]. 600. 400 300 200 100. 100. 200. 300 400 Time [ms]. 500. 600. 0. 100. 200. 300 400 Time [ms]. 500. 600. (f) Integration of F0 distributions Frequency [Hz]. 600 500 400 300 200 100 0. 100. 200. 300 400 Time [ms]. 500. 600. (g) Estimated F0s Frequency [Hz]. 600. 400. 200. 0 0. 100. 200. 300 400 Time [ms]. 500. 600. 700. 0
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(779)
(780)
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(806) 16 14. Channel #. 12 10 8 6 4 2 0. 100. 200. 300 400 Time [ms]. 500. 600. 700. 100. 200. 300 400 Time [ms]. 500. 600. 700. Amplitude. 1500. 1000. 500. 0 0. 4 &
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