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

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

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

Introduction (cont ’ d)

Internet Traffic

Internet Traffic (cont ’ d)

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

Internet Traffic (cont ’ d)

Transformation-Based Reconstruction Algorithms

Transformation-Based Reconstruction Algorithms (cont ’ d)

Experimental Results

Experimental Results (cont ’ d)

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.