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Improved frame erasure concealment for CELP-based coders

Improved frame erasure concealment for CELP-based coders. Juan Carlos De Martin, Takahiro Unno, Vishu Viswanathan DSPS R&D, Texas Instruments Dallas, Texas Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on , Volume: 3 , 2000.

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Improved frame erasure concealment for CELP-based coders

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  1. Improved frame erasure concealment for CELP-based coders Juan Carlos De Martin, Takahiro Unno, Vishu Viswanathan DSPS R&D, Texas Instruments Dallas, Texas Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on , Volume: 3 , 2000 Chin-Kai Wu, CS, NTHU

  2. Outline • Introduction • G.729 Decoder • Concealment in G.729 • Repetition-based Concealment • Muting of Excitation Signal • Jittering of Pitch Delay • LPC Bandwidth Expansion • Interpolative Concealment • Experiment Result Chin-Kai Wu, CS, NTHU

  3. Introduction • G.729 Decoder Chin-Kai Wu, CS, NTHU

  4. Introduction (Cont’d) • Concealment in G.729 • Replaces the missing excitation signal with one of similar characteristics, while gradually decaying its energy • Specific steps • Repetition of the synthesis filter parameters • Attenuation of adaptive and fixed-codebook gains • Attenuation of the memory of the gain predictor • Generation of the replacement excitation Chin-Kai Wu, CS, NTHU

  5. Ge Pitch Delay Jitter Generator LPC Bandwidth Expander Repetition-based Concealment • Proposed Decoder Chin-Kai Wu, CS, NTHU

  6. Muting Factor Muting of Excitation Signal Muting Counter Chin-Kai Wu, CS, NTHU

  7. Muting of Excitation Signal (Cont’d) Chin-Kai Wu, CS, NTHU

  8. Jittering of Pitch Delay Chin-Kai Wu, CS, NTHU

  9. Bad frame applied to last good frame Good frame applied to received good frame LPC Bandwidth Expansion Chin-Kai Wu, CS, NTHU

  10. Interpolative Concealment Chin-Kai Wu, CS, NTHU

  11. Interpolative Concealment (Cont’d) • Adaptive Codebook Parameter • Gain was interpolative between past and future parameters • Median smoothing was applied to codebook index. • Voice classification is the same manner as in G.729 • Fixed Codebook • The same as G.729 Chin-Kai Wu, CS, NTHU

  12. Experiment Result • Repetition-based Concealment • Proposed method does not work well on large packet • Improvement is clearer for female speakers than male speakers Chin-Kai Wu, CS, NTHU

  13. Experiment Result (Cont’d) • Interpolative Concealment Chin-Kai Wu, CS, NTHU

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