Content for TS 26.190 Word version: 18.0.0
4 Outline description
5 Functional description of the encoder
6 Functional description of the decoder
7 Detailed bit allocation of the adaptive multi-rate wideband codec
8 Homing sequences
9 Bibliography
$ Change history
3.2 Symbols p. 7
3.3 Abbreviations p. 12
4 Outline description p. 12
4.1 Functional description of audio parts p. 12
4.2 Preparation of speech samples p. 13
4.3 Principles of the adaptive multi-rate wideband speech encoder p. 13
4.4 Principles of the adaptive multi-rate speech decoder p. 16
4.5 Sequence and subjective importance of encoded parameters p. 16
5 Functional description of the encoder p. 16
5.1 Pre-processing p. 16
5.2 Linear prediction analysis and quantization p. 17
5.2.1 Windowing and auto-correlation computation p. 17
5.2.2 Levinson-Durbin algorithm p. 17
5.2.3 LP to ISP conversion p. 18
5.2.4 ISP to LP conversion p. 19
5.2.5 Quantization of the ISP coefficients p. 20
5.2.6 Interpolation of the ISPs p. 21
5.3 Perceptual weighting p. 21
5.4 Open-loop pitch analysis p. 22
5.4.1 6.60 kbit/s mode p. 22
5.4.2 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 and 23.85 kbit/s modes p. 23
5.5 Impulse response computation p. 24
5.6 Target signal computation p. 24
5.7 Adaptive codebook p. 24
5.8 Algebraic codebook p. 26
5.8.1 Codebook structure p. 26
5.8.1.1 23.85 and 23.05 kbit/s mode p. 26
5.8.1.2 19.85 kbit/s mode p. 26
5.8.1.3 18.25 kbit/s mode p. 27
5.8.1.4 15.85 kbit/s mode p. 27
5.8.1.5 14.25 kbit/s mode p. 27
5.8.1.6 12.65 kbit/s mode p. 28
5.8.1.7 8.85 kbit/s mode p. 28
5.8.1.8 6.60 kbit/s mode p. 28
5.8.2 Pulse indexing p. 29
5.8.3 Codebook search p. 32
5.9 Quantization of the adaptive and fixed codebook gains p. 35
5.10 Memory update p. 36
5.11 High-band gain generation p. 36
6 Functional description of the decoder p. 36
6.1 Decoding and speech synthesis p. 37
6.2 High-pass filtering, up-scaling and interpolation p. 39
6.3 High frequency band p. 40
7 Detailed bit allocation of the adaptive multi-rate wideband codec p. 41
8 Homing sequences p. 47
8.1 Functional description p. 47
8.2 Definitions p. 48
8.3 Encoder homing p. 48
8.4 Decoder homing p. 48
9 Bibliography p. 50
$ Change history p. 51
