ECE6614_MMC4

ECE6614_MMC4 - Multimedia Communications: Audio Compression...

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Multimedia Communications: Audio Compression mmc4.01
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Bandwidths in Audio Formats mmc4.02
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Frequency Bands Contributing Equally to Articulation mmc4.03
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Examples of Audio Waveforms mmc4.04
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Spectrum of CD-grade Audio Signal mmc4.05
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Techniques for Frequency-Domain Coding mmc4.06 Sub-band Coding Transform Coding Main Advantage: Variable bit allocation for minimizing explicit noise shaping.
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Transform and Sub-band Coding Gain mmc4.07 G TC = P TAM /P TGM G SBC = P SAM /P SGM where AM and GM are arithmetic and geometric means and P T and P S are the powers of transform coefficient and sub-band signals max G TC = max G SBC = max G P = 1/SFM
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Integer Sampling Theorem mmc4.08
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Quadrature Mirror Filter Bank mmc4.09
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ITU Coder for 7 kHz Audio mmc4.10 Bit Allocations (kbps): Lower Sub-band Higher Sub-band Data 48 16 0 40 16 8 32 16 16
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Linear Transform of Order 2 mmc4.11 Basis Vector 1 0.707 [1,1] Basis Vector 2 0.707 [1,-1] Transform Coefficient 1 0.707 [x(1) + x(2)] Transform Coefficient 2 0.707 [x(1) - x(2)] The coefficients have unequal variance, and therefore different resolutions in optimum quantization.
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Basis Vectors for Transform Coding (N=8) mmc4.12
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Bit Allocation in Transform Coding mmc4.13
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Transform Coding Gain mmc4.14
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Block Diagram of Stereo Transform Coder mmc4.15
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Entropy Coding mmc4.16
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Psychoacoustic Model of Human Hearing Used in perceptual coding of audio for threshold calculation Three masking effects: Threshold in quiet Frequency masking Temporal masking mmc4.17
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Threshold in quiet and Frequency masking mmc4.18 www.umiacs.umd.edu/~desin/Speech1/node10.html
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Frequency Masking mmc4.19
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Pre-Echo Distortion in Transform Coding: Temporal masking mmc4.20
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Transform Coding with Long and Short Blocks mmc4.21
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ECE6614_MMC4 - Multimedia Communications: Audio Compression...

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