Content for TS 46.010 Word version: 16.0.0
3 Functional description of the RPE-LTP codec
4 Codec homing
5 Computational details of the RPE-LTP codec
6 Digital test sequences
A Codec performance
B Test sequence disks
$ Change History
3 Functional description of the RPE-LTP codec
3.1 Functional description of the RPE-LTP encoder
3.1.1 Offset compensation Word‑p. 14
3.1.2 Pre-emphasis
3.1.3 Segmentation
3.1.4 Autocorrelation Word‑p. 15
3.1.5 Schur Recursion
3.1.6 Transformation of reflection coefficients to Log.-Area Ratios
3.1.7 Quantization and coding of Log.-Area Ratios
3.1.8 Decoding of the quantized Log.-Area Ratios Word‑p. 16
3.1.9 Interpolation of Log.-Area Ratios
3.1.10 Transformation of Log.-Area Ratios into reflection coefficients
3.1.11 Short term analysis filtering
3.1.12 Sub-segmentation Word‑p. 17
3.1.13 Calculation of the LTP parameters
3.1.14 Coding/Decoding of the LTP lags
3.1.15 Coding/Decoding of the LTP gains Word‑p. 18
3.1.16 Long term analysis filtering
3.1.17 Long term synthesis filtering
3.1.18 Weighting Filter Word‑p. 19
3.1.19 Adaptive sample rate decimation by RPE grid selection
3.1.20 APCM quantization of the selected RPE sequence
3.1.21 APCM inverse quantization Word‑p. 20
3.1.22 RPE grid positioning Word‑p. 21
3.2 Decoder
4 Codec homing Word‑p. 25
4.1 Functional description
4.2 Definitions
4.3 Encoder homing Word‑p. 26
4.4 Decoder homing
4.5 Encoder home state Word‑p. 27
4.6 Decoder home state
5 Computational details of the RPE-LTP codec
5.1 Data representation and arithmetic operations
5.2 Fixed point implementation of the RPE-LTP coder Word‑p. 29
5.2.0 Scaling of the input variable Word‑p. 30
5.2.1 Downscaling of the input signal
5.2.2 Offset compensation
5.2.3 Pre-emphasis
5.2.4 Autocorrelation Word‑p. 31
5.2.5 Computation of the reflection coefficients
5.2.6 Transformation of reflection coefficients to Log.-Area Ratios Word‑p. 32
5.2.7 Quantization and coding of the Log.-Area Ratios Word‑p. 33
5.2.8 Decoding of the coded Log.-Area Ratios
5.2.9 Computation of the quantized reflection coefficients Word‑p. 34
5.2.9.1 Interpolation of the LARpp[1..8] to get the LARp[1..8]
5.2.9.2 Computation of the rp[1..8] from the interpolated LARp[1..8]
5.2.10 Short term analysis filtering
5.2.11 Calculation of the LTP parameters Word‑p. 35
5.2.12 Long term analysis filtering Word‑p. 36
5.2.13 Weighting filter
5.2.14 RPE grid selection Word‑p. 37
5.2.15 APCM quantization of the selected RPE sequence
5.2.16 APCM inverse quantization Word‑p. 38
5.2.17 RPE grid positioning Word‑p. 39
5.2.18 Update of the reconstructed short term residual signal dp[-120..-1]
5.3 Fixed point implementation of the RPE-LTP decoder
5.3.1 RPE decoding clause
5.3.2 Long term synthesis filtering Word‑p. 40
5.3.3 Computation of the decoded reflection coefficients
5.3.4 Short term synthesis filtering clause
5.3.5 De-emphasis filtering Word‑p. 41
5.3.6 Upscaling of the output signal
5.3.7 Truncation of the output variable
5.4 Tables used in the fixed point implementation of the RPE-LTP coder and decoder Word‑p. 42
6 Digital test sequences Word‑p. 43
6.1 Input and output signals Word‑p. 44
6.2 Configuration for the application of the test sequences
6.3 Test sequences Word‑p. 45
A Codec performance Word‑p. 53
A.1 Performance of the RPE-LTP
A.1.1 Introduction
A.1.2 Speech performance
A.1.2.1 Single encoding
A.1.2.2 Speech performance when interconnected with coding systems on an analogue basis Word‑p. 54
A.1.3 Non-speech performance Word‑p. 55
A.1.3.1 Performance with single sine waves
A.1.3.2 Performance with DTMF tones
A.1.3.3 Performance with information tones
A.1.3.4 Performance with voice-band data
A.1.4 Delay
A.1.5 Bibliography Word‑p. 57
A.2 Subjective relevance of the speech coder output bits
A.3 Format for test sequence distribution Word‑p. 59
B Test sequence disks Word‑p. 62
$ Change History Word‑p. 63
