Content for TS 26.190 Word version: 16.0.0
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 Word‑p. 7
3.3 Abbreviations Word‑p. 12
4 Outline description
4.1 Functional description of audio parts
4.2 Preparation of speech samples Word‑p. 13
4.3 Principles of the adaptive multi-rate wideband speech encoder
4.4 Principles of the adaptive multi-rate speech decoder Word‑p. 16
4.5 Sequence and subjective importance of encoded parameters
5 Functional description of the encoder
5.1 Pre-processing
5.2 Linear prediction analysis and quantization Word‑p. 17
5.2.1 Windowing and auto-correlation computation
5.2.2 Levinson-Durbin algorithm
5.2.3 LP to ISP conversion Word‑p. 18
5.2.4 ISP to LP conversion Word‑p. 19
5.2.5 Quantization of the ISP coefficients Word‑p. 20
5.2.6 Interpolation of the ISPs Word‑p. 21
5.3 Perceptual weighting
5.4 Open-loop pitch analysis Word‑p. 22
5.4.1 6.60 kbit/s mode
5.4.2 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 and 23.85 kbit/s modes Word‑p. 23
5.5 Impulse response computation Word‑p. 24
5.6 Target signal computation
5.7 Adaptive codebook
5.8 Algebraic codebook Word‑p. 26
5.8.1 Codebook structure
5.8.1.1 23.85 and 23.05 kbit/s mode
5.8.1.2 19.85 kbit/s mode
5.8.1.3 18.25 kbit/s mode Word‑p. 27
5.8.1.4 15.85 kbit/s mode
5.8.1.5 14.25 kbit/s mode
5.8.1.6 12.65 kbit/s mode Word‑p. 28
5.8.1.7 8.85 kbit/s mode
5.8.1.8 6.60 kbit/s mode
5.8.2 Pulse indexing Word‑p. 29
5.8.3 Codebook search Word‑p. 32
5.9 Quantization of the adaptive and fixed codebook gains Word‑p. 35
5.10 Memory update Word‑p. 36
5.11 High-band gain generation
6 Functional description of the decoder
6.1 Decoding and speech synthesis Word‑p. 37
6.2 High-pass filtering, up-scaling and interpolation Word‑p. 39
6.3 High frequency band Word‑p. 40
7 Detailed bit allocation of the adaptive multi-rate wideband codec
8 Homing sequences Word‑p. 47
9 Bibliography Word‑p. 50
$ Change history Word‑p. 51
