User contributions for Superdump
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16 September 2007
- 12:0912:09, 16 September 2007 diff hist +8 AMR-NB-WIP →The LSP vector is converted to LP filter coefficients (c.f. §5.2.4)
15 September 2007
- 08:4808:48, 15 September 2007 diff hist +8 AMR-NB-WIP →Calculation of the quantified fixed gain
- 08:4808:48, 15 September 2007 diff hist +39 N File:Amrnb fixedgain.gif AMR-NB: calculate quantified fixed gain current
- 06:5406:54, 15 September 2007 diff hist −9 AMR-NB-WIP →Pitch gain
- 06:5206:52, 15 September 2007 diff hist −10 AMR-NB-WIP →Fixed gain prediction
- 06:5106:51, 15 September 2007 diff hist +3 AMR-NB-WIP →Pitch sharpening
- 06:5006:50, 15 September 2007 diff hist +37 N File:Amrnb fixvecpitshp.gif AMR-NB: fixed vector pitch sharpening current
- 06:0006:00, 15 September 2007 diff hist +3 AMR-NB-WIP →The available LSP vector(s) are used to linearly interpolate vectors for the other subframes (c.f. §5.2.6)
- 06:0006:00, 15 September 2007 diff hist +6 AMR-NB-WIP →The available LSP vector(s) are used to linearly interpolate vectors for the other subframes (c.f. §5.2.6)
- 06:0006:00, 15 September 2007 diff hist +59 N File:Amrnb lspinterpq3-2.gif AMR-NB: linear interpolation of LSP vector ^q at subframe 3 current
- 05:5905:59, 15 September 2007 diff hist +59 N File:Amrnb lspinterpq2.gif AMR-NB: linear interpolation of LSP vector ^q at subframe 2 current
- 05:5805:58, 15 September 2007 diff hist +59 N File:Amrnb lspinterpq1-2.gif AMR-NB: linear interpolation of LSP vector ^q at subframe 1 current
- 05:5605:56, 15 September 2007 diff hist +59 N File:Amrnb lspinterpq3-1.gif AMR-NB: linear interpolation of LSP vector ^q at subframe 3 current
- 05:5405:54, 15 September 2007 diff hist +59 N File:Amrnb lspinterpq1-1.gif AMR-NB: linear interpolation of LSP vector ^q at subframe 1 current
- 05:5005:50, 15 September 2007 diff hist +137 AMR-NB-WIP →Prediction from the previous frame is added to obtain the mean-removed LSF vector
- 05:5005:50, 15 September 2007 diff hist +394 N File:Amrnb lsfmeanrem2.gif AMR-NB: mean-removed LSF vector ; z_j(n)[i] : the ith coefficient of the mean-removed LSF vector at the jth subframe ; r_j(n)[i] : the ith coefficient of the prediction residual vector of frame n at the jth subframe ; pred_fac[i] : the ith coefficient of current
- 05:4005:40, 15 September 2007 diff hist +24 AMR-NB-WIP →Prediction from the previous frame is added to obtain the mean-removed LSF vectors
- 05:3805:38, 15 September 2007 diff hist −1 AMR-NB-WIP →Prediction from the previous frame is added to obtain the mean-removed LSF vectors
14 September 2007
- 19:3819:38, 14 September 2007 diff hist +26 AMR-NB-WIP →The LSF vectors are converted to cosine domain LSP vectors
- 19:3819:38, 14 September 2007 diff hist +302 N File:Amrnb lspvec.gif AMR-NB: LSP vectors ; q_k[i] : the ith coefficient of the kth line spectral pair (LSP) in the cosine domain ; k : the two lsf vectors give the LSP vectors q2, q4 at the 2nd and 4th subframes; k = 2*j ; f_j[i] : ith coefficient of the jth LSF vector; [0,4 current
- 19:3219:32, 14 September 2007 diff hist +7 AMR-NB-WIP →The mean is added
- 19:3219:32, 14 September 2007 diff hist +173 N File:Amrnb lsfvec.gif AMR-NB: add mean to lsf vectors ; lsf_mean_m : a table of the means of the LSF coefficients ; m : the number of indices parsed according to the mode ; f_j : the LSF vectors current
- 16:3616:36, 14 September 2007 diff hist +45 AMR-NB-WIP →Prediction from the previous frame is added to obtain the mean-removed LSF vectors
- 16:3416:34, 14 September 2007 diff hist +229 N File:Amrnb lsfmeanrem.gif AMR-NB: find the mean-removed LSF vector z_j(n) : a mean-removed LSF vector from the current frame r_j(n) : prediction residual vector of frame n at subframe j ^r_2(n-1) : the quantified 2nd residual vector in the previous frame current
- 16:0916:09, 14 September 2007 diff hist +1 AMR-NB-WIP →Anti-sparseness processing
- 16:0716:07, 14 September 2007 diff hist +1 AMR-NB-WIP →Smoothing of the fixed codebook gain
- 16:0616:06, 14 September 2007 diff hist −118 AMR-NB-WIP No edit summary
- 15:5715:57, 14 September 2007 diff hist +218 AMR-NB-WIP →Other modes - vector quantised gains
- 12:3312:33, 14 September 2007 diff hist +172 AMR-NB-WIP →Smoothing of the fixed codebook gain
- 12:2912:29, 14 September 2007 diff hist +6 AMR-NB-WIP →Smoothing of the fixed codebook gain
- 12:2912:29, 14 September 2007 diff hist +549 AMR-NB-WIP →Smoothing of the fixed codebook gain
- 12:2812:28, 14 September 2007 diff hist +133 N File:Amrnb smoothfac.gif AMR-NB: fixed gain smoothing factor k_m - fixed gain smoothing factor K_1 - 0.4 K_2 - 0.25 diff_m - difference measure at subframe m current
- 12:2512:25, 14 September 2007 diff hist +147 N File:Amrnb meangc.gif AMR-NB: averaged fixed gain used for fixed gain smoothing \bar{g}(m) - mean fixed gain at subframe m ^g_c(k) - quantified fixed gain at subframe k current
- 12:2212:22, 14 September 2007 diff hist +171 N File:Amrnb lspsmooth.gif AMR-NB: averaged LSP vector used for fixed gain smoothing \bar{q}(n) - averaged LSP vector at frame n \hat{q}_4(n) - quantified LSP vector for the 4th subframe at frame n current
- 12:1812:18, 14 September 2007 diff hist +184 N File:Amrnb lspdiff.gif AMR-NB: difference measure for adaptive fixed gain smoothing j - loops over LSPs m - loops over subframes \bar{q} - averaged LSP vector \hat{q}_m - quantified LSP vector at subframe m current
- 12:0912:09, 14 September 2007 diff hist +113 N File:Amrnb gcsmooth.gif AMR-NB: fixed gain smoothing ^g_c - quantified fixed gain k_m - smoothing factor \bar{g_c} - averaged fixed gain current
12 September 2007
- 21:3021:30, 12 September 2007 diff hist +1,066 AMR-NB-WIP →Other modes - vector quantised gains
- 18:2718:27, 12 September 2007 diff hist +19 AMR-NB-WIP →Fixed gain prediction
- 13:1813:18, 12 September 2007 diff hist +460 AMR-NB-WIP →Dequantisation of the gains
- 09:5809:58, 12 September 2007 diff hist +114 AMR-NB-WIP →Decoding of the pitch and fixed codebook gains
- 08:1308:13, 12 September 2007 diff hist −679 AMR-NB-WIP →Fixed gain prediction
- 08:1208:12, 12 September 2007 diff hist +1,536 AMR-NB-WIP →12.2kbps and 7.95kbps - scalar quantised gains
- 08:1008:10, 12 September 2007 diff hist +148 N File:Amrnb meaniner.gif AMR-NB: calculated mean innovation (fixed) energy E_I - calculated mean innovation (fixed) energy N - subframe size 40 c(n) - fixed codebook vector current
- 07:0707:07, 12 September 2007 diff hist +169 N File:Amrnb predener.gif AMR-NB: predicted energy \tilde{E} - predicted energy b = [0.68, 0.58, 0.34, 0.19] - 4-tap MA prediction coefficients ^R(k) - quantified prediction errors at subframe k current
- 06:5106:51, 12 September 2007 diff hist +228 N File:Amrnb fixedgainpred.gif AMR-NB: fixed gain prediction g_c' - predicted fixed gain \tilde{E} - predicted energy \bar{E} - desired mean innovation (fixed) energy (pre-specified, differs with mode) E_I - actual mean innovation (fixed) energy (calculated) current
11 September 2007
- 18:0818:08, 11 September 2007 diff hist +204 AMR-NB-WIP →Decoding of the adaptive and fixed codebook gains
- 16:3216:32, 11 September 2007 diff hist +6 AMR-NB-WIP →Adaptive codebook vector is found by interpolating the past excitation at the pitch lag using an FIR filter
- 16:3016:30, 11 September 2007 diff hist +226 N File:Amrnb pitchvector.gif Finding the adaptive code book vector v(n) by interpolating the past excitation, u(n), at the pitch lag, k, using the b60 FIR filter based on a Hamming windowed sinc function truncated at ±59 and zero-padded at ±60. (AMR-NB) current
- 16:2316:23, 11 September 2007 diff hist +3 AMR-NB-WIP →Computing the reconstructed speech
- 16:1816:18, 11 September 2007 diff hist +210 N File:Amrnb excitation.gif AMR-NB how to construct the excitation vector u(n) - excitation vector ^g_p - quantified pitch gain ^g_c - quantified fixed code book gain v(n) - adaptive (pitch) code book vector c(n) - fixed code book vector current
