IEEE 1857.5-2015

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IEEE Standard for Advanced Mobile Speech and Audio

Published By	Publication Date	Number of Pages
IEEE	2015

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Description

New IEEE Standard – Active. A set of tools to support specific audio coding functions including ACELP/TVC compression, bandwidth extension, stereo coding, frame erasure concealment, etc. is defined in this standard. The tool set defined in this standard provides high quality and efficient coding tool sets for compression, decompression, processing, and representation of speech, music or mixed audio signals to save transmission bandwidth and storage space.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std 1857.5™-2015 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
8	Introduction
9	Contents
11	1. Overview 1.1 Scope 1.2 Purpose 1.3 Audio-coding tools 1.4 Document structure
12	2. Normative references 3. Definitions, symbols, and abbreviations 3.1 Definitions
13	3.2 Symbols and abbreviations
14	3.2.1 Arithmetic operators
15	3.2.2 Logic operators 3.2.3 Relational operators 3.2.4 Bitwise operators
16	3.2.5 Assignment 3.2.6 Constants 3.2.7 Abbreviations
17	4. General overview 4.1 Input signal 4.2 Module composition 4.3 Internal sampling frequency and bit rate
18	4.4 Structure of encoder and decoder
20	4.4.1 LP analysis and synthesis of low frequency 4.4.2 ACELP/TVC module 4.4.3 Stereo coding 4.5 Low complexity operation 4.6 Frame erasure concealment
21	4.7 Bit allocation 4.7.1 Bit allocation for ACELP/TVC encoding
22	4.7.2 Bit allocation for stereo encoder
23	5. Encoder 5.1 Input signal pre-processing 5.1.1 Sampling frequency conversion filter
24	5.1.2 High-pass filtering 5.1.3 Stereo signal downmixing
25	5.2 Hybrid ACELP/TVC encoding mode 5.2.1 Outline description 5.2.2 Timing chart of the ACELP and TVC modes
26	5.2.3 ACELP/TVC mode combinations and mode encoding
27	5.2.4 ACELP/TVC closed loop mode selection
28	5.2.5 ACELP/TVC open loop mode selection 5.2.6 Signal classifier 5.2.6.1 Algorithm
29	5.2.6.2 Encoder parameters extraction
31	5.2.6.3 Initial classification
32	5.2.6.4 Feature parameter extraction
33	5.2.6.5 Signal type decision
38	5.3 ACELP/TVC hybrid coding module 5.3.1 Pre-emphasis 5.3.2 LP analysis, interpolation and quantify 5.3.2.1 LP analysis
39	5.3.2.2 Windowing and auto correlation computation
42	5.3.2.3 Levinson-Durbin algorithm 5.3.2.4 LP to ISP conversion
43	5.3.2.5 ISP to LP conversion
44	5.3.2.6 Quantization of the ISP coefficient
49	5.3.2.7 Interpolation of the ISPs
50	5.3.3 Perceptual weighting
51	5.3.4 ACELP excitation coding 5.3.4.1 Open-loop pitch search
56	5.3.4.2 Impulse response calculation 5.3.4.3 Target signal computation
57	5.3.4.4 Adaptive codebook
59	5.3.4.5 Fixed codebook
62	5.3.4.6 Pre-filter before the Algebraic codebook search 5.3.4.7 Algebraic codebook search
66	5.3.4.8 Encoding method of codebook vector
72	5.3.4.9 Adaptive and algebraic codebook gain quantization
74	5.3.5 TVC Excitation encoder
76	5.3.5.1 Computation of target signal 5.3.5.2 Switch the encoder mode
78	5.3.5.3 Pre shaping for peak value
79	5.3.5.4 Multi-scale control
80	5.3.5.5 Split multi-rate lattice VQ
93	5.3.5.6 Gain balance 5.3.5.7 De-shaping for peak value 5.3.5.8 Global gain
94	5.4 Mono signal high-band encoding (BWE)
96	5.5 Parameters stereo encoding in frequency domain 5.5.1 Encoding principle 5.5.2 Linear prediction filter
97	5.5.3 Signal type analysis 5.5.4 Signal estimation
98	5.5.5 Time frequency transform
100	5.5.6 Frequency extraction 5.5.7 Low-frequency encoding 5.5.8 High-frequency gain control
101	5.5.9 Bit stream control
102	5.6 Streaming format 5.6.1 TVC encoding parameter transmission
103	5.6.1.1 Multiplexing concept of single binary table
104	5.6.1.2 Multiplexing of multiple binary table
106	5.6.2 Packing process of all parameters
107	5.6.3 TVC gain multiplex
108	5.6.4 Stereo encoding parameters packaging format 6. Decoder 6.1 Mono low frequency synthesis 6.1.1 ACELP mode decoding and signal synthesis
111	6.1.2 TVC decoder
113	6.1.3 Decoding the quantization values
117	6.1.3.1 Gain balance and the de-shaping for peak value
118	6.1.3.2 Switching of the decoder mode
119	6.1.4 Post processing of mono low-band signal 6.2 Mono signal high-band synthesis
121	6.3 Stereo low-frequency synthesis 6.3.1 Decoding principle
122	6.3.2 Linear prediction filtering 6.3.3 Signal estimation
123	6.3.4 Time frequency transform 6.3.5 Frequency extraction 6.3.6 Low frequency reconstruction 6.3.7 High frequency reconstruction
124	6.3.8 Combination frequency coefficient
125	6.3.9 Frequency time transformation 6.3.10 Linear prediction synthesize
126	6.4 Packet loss concealment 6.4.1 Mode extrapolation 6.4.2 ACELP packet loss concealment 6.4.2.1 Pitch delay parameter extrapolation
127	6.4.2.2 ISF parameters extrapolation 6.4.2.3 Fixed codebook extrapolation
128	6.4.2.4 Adaptive codebook gain and fixed codebook gain parameters extrapolation 6.4.3 TVC dropped frames handling 6.4.3.1 Extrapolation
130	6.4.3.2 ISF parameters inferred 6.5 Post processing
131	6.6 Producing output signal 7. Detailed bit allocation
139	8. Storage and transport interface formats 8.1 Encode mode and bit rates
140	8.2 Transport format 8.3 Storage format
143	Annex A (normative)Tables of stereo parameters
148	Annex B (informative)Comfortable noise model B.1 Summary B.2 Encoder function
149	B.3 Background noise parameters calculation
150	8.3.1 Background noise stability analysis B.4 Decoder function
151	B.5 Comfort noise generation and update
152	Annex C (normative)Voice activity detection C.1 Summary C.2 Function description
156	Back cover