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Uses of the pitch-scaled harmonic filter in speech processing

Uses of the pitch-scaled harmonic filter in speech processing. by Philip Jackson * and Christine Shadle †. School of Electronic and Electrical Engineering, University of Birmingham Department of Electronics and Computer Science, University of Southampton. Prologue.

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Uses of the pitch-scaled harmonic filter in speech processing

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  1. Uses of the pitch-scaled harmonic filter in speech processing by Philip Jackson* and Christine Shadle† • School of Electronic and Electrical Engineering, University of Birmingham • Department of Electronics and Computer Science, University of Southampton

  2. Prologue • Much Ado About Nothing (Act 2) Balthasar: “Note this before my notes: There’s not a note of mine that’s worth the noting.”

  3. Pitch-scaled harmonic filter • Developed to study turbulence noise during voicing • Many potential speech applications: • coding • analysis • perception • recognition

  4. Spectral smearing • Effect of rectangular windowing

  5. Spectral smearing • Effect of Hann windowing

  6. Minimising spectral smearing • Influence of negative frequencies

  7. Minimising spectral smearing • Influence of higher harmonics

  8. Decomposition Harmonic filter: Interpolation:

  9. PSHF decomposition

  10. Performance measure Synthesis: Change in Signal-to-Error Ratio: where

  11. Evaluation - HNR aperiodic periodic

  12. Evaluation (periodic) +10 dB

  13. Evaluation (aperiodic) +10 dB

  14. Time series for /ax-v:/

  15. Short-time power for /ax-v:/

  16. Power spectra for /v:/ F0 F1 F2 F3

  17. LPC spectra for /v:/ F0 F1 F2 F3

  18. MFCC spectra for /v:/ MFCC LPC F0 F1 F2 F3 F0 F1 F2 F3

  19. Power spectra for /zh:/ F2

  20. Fricative spectra for /zh:/ F2

  21. LPC spectra for /zh:/ LPC MFCC Z1 Z1

  22. Summary • Pitch-scaled harmonic filter: • Benefits of pitch scaling • Case for interpolation • Periodic + aperiodic for TD and FD • Evaluated on synthetic speech • Applied to real data: • Time series • Power spectra • Short-time power • LPC • MFCC

  23. Epilogue • Much Ado About Nothing (Act 2) Balthasar: “Then sigh not so, but let them go, And be you blithe and bonny; Converting all your sounds of woe Into Hey nonny nonny [aka. HNNs].”

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