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MPEG Surround

Student: Shang-Yu Yeh Adviser : H.-M. Hang 2007/12/17. MPEG Surround. Outline. MPEG Surround Introduction T/F Resolution and DataMode Adaptive Parameter Smoothing Experimental Results. MPEG Surround Introduction.

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MPEG Surround

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  1. Student: Shang-Yu Yeh Adviser : H.-M. Hang 2007/12/17 MPEG Surround

  2. Outline • MPEG Surround Introduction • T/F Resolution and DataMode • Adaptive Parameter Smoothing • Experimental Results

  3. MPEG Surround Introduction • Low-bitrate parametric coding technology for multi-channel audio signal • Backward compatibility to stereo equipment • Exploits inter-channel differences in level, phase and coherence equivalent to the spatial cues to capture the spatial image of a multi-channel audio signal • Spatial cues: CLD, ICC, CPC

  4. Spatial Audio Coding Encoder: Decoder:

  5. MPEG Surround Encoder Architecture:

  6. T/F Resolution and DataMode • Parameter extraction • reduce the accuracy of samples parameter bands 71 hybrid subbands parameter sets

  7. T/F Resolution and DataMode New Architecture: Time Resolution Decision DataMode & Freq Resolution Decision AdaptiveParameter Smooth

  8. T/F Resolution • “Resolution” refers to the number of parameters 0 0 1 2 3 Frequency (pb) pbStride Time (ps)

  9. Time Resolution Decision • Choose the number of parameter sets for a frame • Can be fixed or variable 0 1 2 3 0 1 2 3

  10. DataMode Decision • Exploit the correlation between subsequent sets • 4 modes: default, keep, interpolation and lossless data set 0 1 2 3 0 1 2 parameter set

  11. Freq Resolution Decision • Choose a stride that make the decoding error minimum • Exploit correlation between bands • pbStride can be: 1, 2, 5, 28 data set 0 1 2 stride stride stride

  12. Freq Resolution Decision • Pairing: grouping of 2 parameter subsets to share some data (QP, pbStride…) • Pairing of non-neighboring sets will not have gain data set 0 1 2 pair

  13. Combination of 2 modules

  14. Adaptive Parameter Smoothing • For artifacts from coarse quantization and low up-date rate of spatial cues • Especially in the case of stationary and tonal signals • First order IIR filtering of the parameter bands

  15. Adaptive Parameter Smoothing Smooth strengh: A B

  16. Adaptive Parameter Smoothing • Configure for each parameter set • Error estimation: • Parameter normalization:

  17. Experimental Results • Add DataMode and Freq Resolution Decision Modules without any loss • Bitrate reduction(%): (pb=10)

  18. Experimental Results • DataMode Decision: • Bitrate reduction(%): (ps=1, pb=10)

  19. Experimental Results • Freq Resolution Decision: • Bitrate reduction(%): (ps=1, pb=10)

  20. Experimental Results • Overall Bitrate reduction(%): (pb=10)

  21. Experimental Results

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