MPEG USAC Minjie Xie Huawei Technologies
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1 MPEG USAC Minjie Xie Huawei Technologies HUAWEI TECHNOLOGIES CO., LTD. HUAWEI TECHNOLOGIES CO., LTD. Page 1
2 Overview of Main MPEG Audio Standards MPEG-1: standardized in 1992 MPEG-2: standardized in MPEG-4: standardized in MPEG Surround: standardized in 2006 MPEG Unified Speech and Audio Coding (USAC): ongoing HUAWEI TECHNOLOGIES CO., LTD. Page 2
3 MPEG-1 Audio Standard Layer I: provides broadcast quality at 192 kbps per channel Layer II: provides broadcast quality at 128 kbps per channel Layer III (MP3): provides broadcast quality at 96 kbps per channel HUAWEI TECHNOLOGIES CO., LTD. Page 3
4 MPEG-2 Audio Standard MPEG-2: low sampling rate (16 khz, khz, and 24 khz) and multichannel MPEG-2 Advanced Audio Coding (AAC): provides broadcast quality at 64 kbps per channel - Sampling rate : 8 96 khz - Bit rate: kbps HUAWEI TECHNOLOGIES CO., LTD. Page 4
5 MPEG-4 Audio Standard MPEG-4 Low-Delay AAC (AAC-LD): 10-ms frame length at a sampling rate of 48 khz MPEG-4 High-Efficiency AAC (HE-AAC): combination of an AAC coder with bandwidth extension HUAWEI TECHNOLOGIES CO., LTD. Page 5
6 MPEG Surround Spatial parameter coding: side information for multichannel Core coder: stereo downmix from Surround 48 kbps for 5.1 channel (9.6 kbps per channel) HUAWEI TECHNOLOGIES CO., LTD. Page 6
7 MPEG USAC Call for Proposals was issued at the 82 nd MPEG meeting in October, 2007 USAC Reference Model 0 (RM0) was selected at the 85 th MPEG meeting in July, 2008 Development of a USAC MPEG Reference Encoder was proposed and agreed at the 86 th MPEG meeting in October, 2008 HUAWEI TECHNOLOGIES CO., LTD. Page 7
8 Envisioned Use Cases Multimedia download to mobile devices Mobile TV Digital Radio Audio books HUAWEI TECHNOLOGIES CO., LTD. Page 8
9 Requirements for USAC Bit rate: kbps Channel: mono and stereo Signal: speech, music, and mixed content Quality: better than 3GPP AMR-WB+ or eaac+ (HE-AAC v2) Delay: not specified Complexity: not specified HUAWEI TECHNOLOGIES CO., LTD. Page 9
10 Core Experiments (CEs) on USAC More than 20 CEs contributions on Reference Model were submitted Four missing modules for USAC MPEG Reference Encoder were contributed: 3 contributions from Huawei and 1 contribution from Qualcomm HUAWEI TECHNOLOGIES CO., LTD. Page 10
11 MPEG USAC Encoder (RM0) Signal Classifier ACELP/TCX (LPD) Input audio MPEG Surround esbr Quantization and Coding AAC Tools (FD) Bitstream Multiplexer Coded data HUAWEI TECHNOLOGIES CO., LTD. Page 11
12 Common Pre-processing Signal classification - Indicate signal category speech or music MPEG Surround - Create downmix mono from the stereo signal as input to Core Coder - Extract spatial parameters as side information SBR - Bandwidth extension for high frequencies HUAWEI TECHNOLOGIES CO., LTD. Page 12
13 Frequency-Domain Encoding (AAC) Selected to code music at lower bit rates and both speech and music at higher bit rates AAC tools - TW-MDCT, Block switching, Perceptual model, Temporal Noise Shaping (TNS), Bit-reservoir, M/S, Quantization and coding, etc. HUAWEI TECHNOLOGIES CO., LTD. Page 13
14 LP-Domain Encoding (ACELP/TCX) Selected to code speech signal for lower bit rates ACELP - Algebraic codebook, AVQ-based LPC TCX - MDCT-based transform coding, transform coefficients quantized and coded with AAC tools as in FD Mode HUAWEI TECHNOLOGIES CO., LTD. Page 14
15 MPEG USAC Decoder (RM0) Coded data Bitstream De-multiplexer ACELP/TCX (LPD) De-quantization and Decoding esbr MPEG Surround Output audio AAC Tools (FD) HUAWEI TECHNOLOGIES CO., LTD. Page 15
16 Decoding of MPEG USAC Decoding the quantized and coded spectra (FD), OR LP parameters with the quantized and coded spectra (TCX) or coded TD excitation (ACELP) Filterbank control information esbr control information MPEG Surround control information Other control information HUAWEI TECHNOLOGIES CO., LTD. Page 16
17 Summary Provide best audio quality for all signal types Be used for audio storage and streaming Continue the CE process Continue the development of the USAC MPEG Reference Encoder Be finalized in 2011 (???) HUAWEI TECHNOLOGIES CO., LTD. Page 17
18 Thank You HUAWEI TECHNOLOGIES CO., LTD. Page 18
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