1
General
1.1
Scope and outline description
1.2
Functional description of the audio parts
1.3
Possible modes of operation and implications of inserting data
1.4
Functional description of the SB-ADPCM encoder
1.5
Functional description of the SB-ADPCM decoder
1.6
Timing requirements
2
Transmission characteristics
2.1
Characteristics of the audio ports and the test points
2.2
Overload point
2.3
Nominal reference frequency
2.4
Transmission characteristics of the 64 kbit/s (7 kHz) audio codec
2.5
Transmission characteristics of the audio parts
2.6
Transcoding to and from 64 kbit/s PCM
3 SB-ADPCM
encoder principles
3.1 Transmit
QMF
3.2 Difference
signal computation
3.3 Adaptive
quantizer
3.4 Inverse
adaptive quantizers
3.5 Quantizer
adaptation
3.6 Adaptive
prediction
4 SB-ADPCM
decoder principles
4.1 Inverse
adaptive quantizer
4.2 Quantizer
adaptation
4.3
Adaptive prediction
4.4
Receive QMF
5
Computational details for QMF
5.1
Input and output signals
5.2
Description of variables and detailed specification of sub-blocks
6
Computational details for lower and higher sub-band ADPCM
6.1
Input and output signals
6.2
Description of variables and detailed specification of sub-blocks
Annex A – Testing signal-to-total distortion ratio for 7 kHz
audio-codecs at 64 kbit/s Recommendation ITU-T G.722 connected
back-to-back
Annex B – Superwideband embedded extension for ITU-T G.722
B.1
Scope
B.2
Normative references
B.3
Abbreviations and acronyms
B.4
Conventions
B.5
General description of the coder
B.6
Functional description of the encoder
B.7
Functional description of the decoder
B.8
Bit-exact description of the ITU-T G.722 superwideband extension coder
Annex C – Floating-point implementation of ITU-T G.722 Annex B
C.1 Algorithmic
description
C.2 ANSI C
code
Annex D – Stereo embedded extension for ITU-T G.722
D.1
Scope
D.2
References
D.3
Abbreviations and acronyms
D.4
Conventions
D.5
General description of the coder
D.6
Functional description of the encoder
D.7
Functional description of the decoder
D.8
Bit-exact description of the ITU-T G.722 stereo extension coder
Appendix I – Networking aspects
I.1
Network characteristics
I.2
Integration into the telecommunications network
I.3
Audio performance of the 64 kbit/s (7 kHz) audio-coding system
I.4
Audio performance when interconnected with other coding systems on an
analogue basis
I.5
Audio performance under mode switching
I.6
Auxiliary data channel performance
I.7
Multi-point conference configuration
I.8
Digital transcoding between the 64 kbit/s (7 kHz) audio-coding system
and 64 kbit/s PCM
Appendix II – Digital test sequences
II.1
Input and output signals
II.2
Configurations for the application of test sequences
II.3
Test sequences
II.4
Format for test sequence distribution
Appendix III – A high-quality packet loss concealment algorithm for
ITU-T G.722
III.1
Scope
III.2
References
III.3
Abbreviations and acronyms
III.4
Conventions
III.5
General description of the PLC algorithm
III.6
WB PCM PLC – Waveform extrapolation of ITU-T G.722 output
Page
III.7
Re-encoding of PLC output
III.8
Monitoring signal characteristics and their use for PLC
III.9
Time lag computation
III.10
Re-phasing
III.11
Time-warping
III.12
Bit-exact description of the ITU-T G.722 PLC algorithm
Appendix IV – A low-complexity algorithm for packet-loss concealment
with ITU-T G.722
IV.1
Scope
IV.2
References
IV.3
Abbreviations and acronyms
IV.4
Notations and conventions
IV.5
General description of the ITU-T G.722 PLC algorithm
IV.6
Functional description of the ITU-T G.722 PLC algorithm
IV.7
Bit-exact description of the ITU-T G.722 PLC algorithm
Appendix V – Mid-side stereo coding
V.1
Scope
V.2
Description of the mid-side stereo coding
V.3
Computational complexity