7 Detailed bit allocation of the adaptive multi-rate wideband codec
26.1903GPPAdaptive Multi-Rate - Wideband (AMR-WB) speech codecSpeech codec speech processing functionsTranscoding functionsTS
The detailed allocation of the bits in the adaptive multi-rate wideband speech encoder is shown for each mode in table 12a-12i. These tables show the order of the bits produced by the speech encoder. Note that the most significant bit (MSB) of each codec parameter is always sent first.
Table 12a: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 477 bits/20 ms, 23.85 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s68 |
Codebook Index1 for track 1 |
|
s69 – s79 |
Codebook Index1 for track 2 |
|
ss80 –s90 |
Codebook Index1 for track 3 |
|
s91-s101 |
Codebook Index1 for track 4 |
|
s102-s112 |
Codebook Index2 for track 1 |
|
s113-s123 |
Codebook Index2 for track 2 |
|
s124 – s134 |
Codebook Index2 for track 3 |
|
s135 – s145 |
Codebook Index2 for track 4 |
|
s146 – s152 |
codebook gains |
|
s153 – s156 |
High-band energy |
|
subframe 2 |
|
|
s157 – s162 |
adaptive codebook index (relative) |
|
s163 – s262 |
same description as s57 – s156 |
|
subframe 3 |
|
|
s263 – s371 |
same description as s48 – s156 |
|
subframe 4 |
|
|
s372 – s477 |
same description as s157 – s262 |
Table 12b: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 461 bits/20 ms, 23.05 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s68 |
Codebook Index1 for track 1 |
|
s69 – s79 |
Codebook Index1 for track 2 |
|
ss80 –s90 |
Codebook Index1 for track 3 |
|
s91-s101 |
Codebook Index1 for track 4 |
|
s102-s112 |
Codebook Index2 for track 1 |
|
s113-s123 |
Codebook Index2 for track 2 |
|
s124 – s134 |
Codebook Index2 for track 3 |
|
s135 – s145 |
Codebook Index2 for track 4 |
|
s146 – s152 |
codebook gains |
|
subframe 2 |
|
|
s153 – s158 |
adaptive codebook index (relative) |
|
s159 – s254 |
same description as s57 – s152 |
|
subframe 3 |
|
|
s255 – s359 |
same description as s48 – s152 |
|
subframe 4 |
|
|
s360 – s461 |
same description as s153 – s254 |
Table 12c: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 397 bits/20 ms, 19.85 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s67 |
Codebook Index1 for track 1 |
|
s68 – s77 |
Codebook Index1 for track 2 |
|
s78 – s79 |
Pulse Selector for track 3 |
|
s80 – s81 |
Pulse Selector for track 4 |
|
s82 – s91 |
Codebook index2 for track 1 |
|
s92 – s101 |
Codebook index2 for track 2 |
|
s102 – s115 |
Codebook index for track 3 |
|
s116 – s129 |
Codebook index for track 4 |
|
s130 – s136 |
VQ gain |
|
subframe 2 |
|
|
s137 – s142 |
adaptive codebook index (relative) |
|
s143 – s222 |
same description as s57 – s136 |
|
subframe 3 |
|
|
s223 – s311 |
same description as s48 – s136 |
|
subframe 4 |
|
|
s312 – s397 |
same description as s137 – s222 |
Table 12d: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 365 bits/20 ms, 18.25 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s59 |
Pulse Selector for track 1 |
|
s60 – s61 |
Pulse Selector for track 2 |
|
s62 – s63 |
Pulse Selector for track 3 |
|
s64 – s65 |
Pulse Selector for track 4 |
|
s66 – s79 |
Codebook index for track 1 |
|
s80 – s93 |
Codebook index for track 2 |
|
s94 – s107 |
Codebook index for track 3 |
|
s108 – s121 |
Codebook index for track 4 |
|
s122 – s128 |
VQ gain |
|
subframe 2 |
|
|
s129 – s134 |
adaptive codebook index (relative) |
|
s135 – s206 |
same description as s57 – s128 |
|
subframe 3 |
|
|
s207 – s287 |
same description as s48 – s128 |
|
subframe 4 |
|
|
s288 – s365 |
same description as s129 – s206 |
Table 12e: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 317 bits/20 ms, 15.85 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s70 |
Codebook index for track 1 |
|
s71 – s83 |
Codebook index for track 2 |
|
s84 – s96 |
Codebook index for track 3 |
|
s97 – s109 |
Codebook index for track 4 |
|
s110 – s116 |
VQ gain |
|
subframe 2 |
|
|
s117 – s122 |
adaptive codebook index (relative) |
|
s123 – s182 |
same description as s57 – s116 |
|
subframe 3 |
|
|
s183 – s251 |
same description as s48 – s116 |
|
subframe 4 |
|
|
s252 – s317 |
same description as s117 – s182 |
Table 12f: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 285 bits/20 ms, 14.25 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s70 |
Codebook index for track 1 |
|
s71 – s83 |
Codebook index for track 2 |
|
s84 – s92 |
Codebook index for track 3 |
|
s93 – s101 |
Codebook index for track 4 |
|
s102 – s108 |
VQ gain |
|
subframe 2 |
|
|
s109 – s114 |
adaptive codebook index (relative) |
|
s115 – s166 |
same description as s57 – s108 |
|
subframe 3 |
|
|
s167 – s227 |
same description as s48 – s108 |
|
subframe 4 |
|
|
s228 – s285 |
same description as s109 – s166 |
Table 12g: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 253 bits/20 ms, 12.65 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s56 |
adaptive codebook index |
|
s57 |
LTP-filtering-flag |
|
s58 – s66 |
Codebook index for track 1 |
|
s67 – s75 |
Codebook index for track 2 |
|
s76 – s84 |
Codebook index for track 3 |
|
s85 – s93 |
Codebook index for track 4 |
|
s94 – s100 |
VQ gain |
|
subframe 2 |
|
|
s101 – s106 |
adaptive codebook index (relative) |
|
s107 – s150 |
same description as s57 – s100 |
|
subframe 3 |
|
|
s151 – s203 |
same description as s48 – s100 |
|
subframe 4 |
|
|
s204 – s253 |
same description as s101 – s150 |
Table 12h: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 177 bits/20 ms, 8.85 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 ‑ s23 |
index of 3rd ISP subvector |
|
s24 – s30 |
index of 4th ISP subvector |
|
s31 – s37 |
index of 5th ISP subvector |
|
s38 – s42 |
index of 6th ISP subvector |
|
s43 – s47 |
index of 7th ISP subvector |
|
subframe 1 |
|
|
s48 – s55 |
adaptive codebook index |
|
s56 – s60 |
Codebook index for track 1 |
|
s61 – s65 |
Codebook index for track 2 |
|
s66 – s70 |
Codebook index for track 3 |
|
s71 – s75 |
Codebook index for track 4 |
|
s76 – s81 |
VQ gain |
|
subframe 2 |
|
|
s82 – s86 |
adaptive codebook index (relative) |
|
s87 – s112 |
same description as s56 – s81 |
|
subframe 3 |
|
|
s113 – s146 |
same description as s48 – s81 |
|
subframe 4 |
|
|
s147 – s177 |
same description as s82 – s112 |
Table 12i: Source encoder output parameters in order of occurrence and bit allocation within the speech frame of 132 bits/20 ms, 6.60 kbit/s mode
|
Bits (MSB‑LSB) |
Description |
|
s1 |
VAD-flag |
|
s2 – s9 |
index of 1st ISP subvector |
|
s10 – s17 |
index of 2nd ISP subvector |
|
s18 – s24 |
index of 3rd ISP subvector |
|
s25 – s31 |
index of 4th ISP subvector |
|
s32 – s37 |
index of 5th ISP subvector |
|
subframe 1 |
|
|
s38 – s45 |
adaptive codebook index |
|
s46 – 57 |
Codebook Index |
|
s58 – s63 |
VQ gain |
|
subframe 2 |
|
|
s64 – s68 |
adaptive codebook index (relative) |
|
s69 – s86 |
same description as s46 – s63 |
|
subframe 3 |
|
|
s87 – s109 |
same description as s64 – s86 |
|
subframe 4 |
|
|
s110 – s132 |
same description as s64 – s86 |