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Spectrum Enhancement

Spectrum Enhancement. Speech Processing Dec. 11, 2006 YOUNG-CHAN LEE. Spectrum enhancement. Goal : find noiseless spectrum for speech signal Regard corrupted signal consist of noise, pure signal and background noise. Same spectrum components. Equation-method(1). Spectrum enhancement.

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Spectrum Enhancement

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  1. Spectrum Enhancement Speech Processing Dec. 11, 2006 YOUNG-CHAN LEE

  2. Spectrum enhancement • Goal : find noiseless spectrum for speech signal • Regard corrupted signal consist of noise, pure signal and background noise. Same spectrum components

  3. Equation-method(1) • Spectrum enhancement Global information (average) Local information (average) Estimate of background

  4. Spectrogram

  5. New Equation – method-(2) • Analysis of each component and find parameters Part – 1 (Global energy) Part – 2 (local energy) Part – 3 (Background estimate) Part – 4 (Floor)

  6. Additive Noise Suppression • Suppress noise compare to speech signal

  7. Part - 1 • Spectrum and global energy

  8. Part - 2 • Spectrum and local energy

  9. Part - 3 • Spectrum and background estimate

  10. Estimate of Background Before background estimate New background estimate

  11. Part - 4 • Spectrum and floor

  12. Overall spectrum

  13. Comparison of enhanced spectrum

  14. Examples • File list (used same parameters) • CCW170007_000.ulaw • CCW170007_001.ulaw • CCW170007_002.ulaw • CCW170007_003.ulaw • CCW170007_004.ulaw • CCW170007_005.ulaw • CCW170007_006.ulaw • CCW170007_007.ulaw • CCW170007_008.ulaw • CCW170007_009.ulaw

  15. Example1(CCW1700007_000.ulaw)

  16. Continue (spectrum)

  17. Example2(CCW1700007_001.ulaw)

  18. Continue (spectrum)

  19. Example3(CCW1700007_002.ulaw)

  20. Continue (spectrum)

  21. Example4(CCW1700007_003.ulaw)

  22. Continue (spectrum)

  23. Example5(CCW1700007_004.ulaw)

  24. Continue (spectrum)

  25. Example6(CCW1700007_005.ulaw)

  26. Continue (spectrum)

  27. Example7(CCW1700007_006.ulaw)

  28. Continue (spectrum)

  29. Example8(CCW1700007_007.ulaw)

  30. Continue (spectrum)

  31. Example9(CCW1700007_008.ulaw)

  32. Continue (spectrum)

  33. Example10(CCW1700007_009.ulaw)

  34. Continue (spectrum)

  35. Conclusions • Global energy, local energy, background estimate greatly affected to build enhanced spectrum. • Part3 and part4 showed good spectrum estimation. • In new method, we don’t need to change parameter values according to input files.

  36. MATLAB Demo

  37. Thank you! • Merry Christmas

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