랩세미나 20070920

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랩세미나 20070920

  1. 1. Session: Wideband Speech Coding Presenter: Young Han Lee
  2. 2. <ul><li>Objective Analysis of the Effect of Memory Inclusion on Bandwidth Extension of Narrowband Speech </li></ul><ul><li>Artificial Bandwidth Extension without Side Information for ITU-T G.729.1 </li></ul><ul><li>The Effect of Highband Harmonic Structure in the Artificial Bandwidth Expansion of Telephone Speech </li></ul>
  3. 3. <ul><li>Artificial Bandwidth Extension for Speech Signals using Speech Recognition </li></ul><ul><li>Voicing-Based Codebook in Low-Rate Wideband CELP Coding </li></ul><ul><li>Performance of Speaker-Dependent Wideband Speech Coding </li></ul>
  4. 4. <ul><li>Main Idea </li></ul><ul><ul><li>Wideband Extension without extra information </li></ul></ul>< Proposed structure >
  5. 5. <ul><li>Original BWE Scheme </li></ul><ul><li>HF Parameter Estimation </li></ul><ul><ul><li>MMSE Estimation for TDBWE parameter </li></ul></ul>
  6. 6. <ul><li>Result </li></ul><ul><ul><li>Spectrum </li></ul></ul><ul><ul><li>No Listening test </li></ul></ul><ul><ul><ul><li>Worse than original </li></ul></ul></ul><ul><ul><ul><li>Muffled, limited dynamic range. </li></ul></ul></ul>
  7. 7. <ul><li>Main Idea </li></ul><ul><ul><li>Reproduce voiced sounds </li></ul></ul>
  8. 8. <ul><li>Main Idea </li></ul><ul><ul><li>Ptich-adaptive modulation </li></ul></ul>
  9. 9. <ul><li>Result </li></ul><ul><ul><li>AMR-WB based </li></ul></ul><ul><ul><li>Finnish and Chinese </li></ul></ul><ul><ul><li>CCR test </li></ul></ul>
  10. 10. <ul><li>Result </li></ul><ul><ul><li>ABX test </li></ul></ul>
  11. 11. <ul><li>Main Idea </li></ul><ul><ul><li>Wideband Estimate from speech recognition </li></ul></ul>
  12. 12. <ul><li>Proposed method </li></ul>
  13. 14. <ul><li>Result </li></ul>
  14. 15. <ul><li>Main Idea </li></ul><ul><ul><li>New Vocing-based Vector Quantization </li></ul></ul><ul><ul><ul><li>1/3 codebook entry </li></ul></ul></ul><ul><ul><ul><li>Processing delay is reduced </li></ul></ul></ul><ul><ul><ul><li>Implemented in an ACELP Wideband coder </li></ul></ul></ul>
  15. 16. <ul><li>Main Idea </li></ul>
  16. 17. <ul><li>Main Idea </li></ul><ul><ul><li>Conditional Codebook </li></ul></ul><ul><ul><ul><li>Voiced-speech CodeBook </li></ul></ul></ul><ul><ul><ul><li>Unvoiced-speech CodeBook </li></ul></ul></ul><ul><ul><ul><li>Third CodeBook </li></ul></ul></ul><ul><ul><ul><ul><li>For transition speech. </li></ul></ul></ul></ul>
  17. 18. <ul><li>Result </li></ul><ul><ul><li>SegSBR </li></ul></ul><ul><ul><li>Spectral Distortion </li></ul></ul>

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