1. Transformation-Based Reconstruction for Real- Time Voice Transmissions over the Internet Hung, Kuo-EnNTHU/CS, Visual Communication Lab. Benjamin W.Wah, Fellow, IEEE, and Dong Lin

2. Outline Introduction Internet Traffic Experiments Transformation-Based Reconstruction Algorithms Experimental Results Conclusion

3. Introduction Loss-concealment mechanisms Receiver-based Sender- and receiver-based Signal-to-Noise Ratio (SNR)

4. Introduction (cont ’ d)

7. Internet Traffic

8. Internet Traffic (cont ’ d)

9. n s : Total number of lost Pr: Conditional probability j: consecutive losses of length i: interleaving factor : loss happen times

10. Internet Traffic (cont ’ d)

11. Transformation-Based Reconstruction Algorithms

12. Transformation-Based Reconstruction Algorithms (cont ’ d)

15. Experimental Results

16. Experimental Results (cont ’ d)

23. Conclusion Proposed a new transformation-base reconstruction algorithm for real-time low-delay voice transmissions over the internet. This algorithm is general and can be extended easily to other interpolation-based reconstruction algorithms. Future work is extending the method to low-bit rate compression methods, such as CELP.