Description: 英文版G.729语音压缩标准。
GENERAL ASPECTS OF DIGITAL TRANSMISSION
SYSTEMS
CODING OF SPEECH AT 8 kbit/s
USING CONJUGATE-STRUCTURE
ALGEBRAIC-CODE-EXCITED
LINEAR-PREDICTION (CS-ACELP) Platform: |
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Author:guxiao |
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Description: ITU-T G.729语音压缩算法。
description:
Fixed-point description of commendation G.729 with ANNEX B Coding of Speech at 8 kbit/s using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) with Voice Activity Decision(VAD), Discontinuous Transmission(DTX), and Comfort Noise Generation(CNG).-ITU-T G.729 voice compression algorithms. description: Fixed-point description of commendation G.729 with ANNEX B Coding of Speech at 8 kbit/s using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) with Voice Activity Decision (VAD), Discontinuous Transmission ( DTX), and Comfort Noise Generation (CNG). Platform: |
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Author:kevin |
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Description: 英文版G.729语音压缩标准。
GENERAL ASPECTS OF DIGITAL TRANSMISSION
SYSTEMS
CODING OF SPEECH AT 8 kbit/s
USING CONJUGATE-STRUCTURE
ALGEBRAIC-CODE-EXCITED
LINEAR-PREDICTION (CS-ACELP)-The English version of G.729 voice compression standards. GENERAL ASPECTS OF DIGITAL TRANSMISSIONSYSTEMSCODING OF SPEECH AT 8 kbit/sUSING CONJUGATE-STRUCTUREALGEBRAIC-CODE-EXCITEDLINEAR-PREDICTION (CS-ACELP) Platform: |
Size: 277504 |
Author:guxiao |
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Description: Implementation of a speech codec based on coding of speech at 8 kbit/s
using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP)
- We took .wav files that is sampled at 8000 Hz using 16-bit linear PCM. The encoding process is done every 10ms frame or 80 samples. For the preprocessing stage, the samples are high passed with cut-off frequency of 140 Hz and scaled down by 2. A total of 240 samples are buffer for windowing and autocorrelation computation. The autocorrelation coefficients are used to calculate the LP filter coefficients using the Levinson-Durbin algorithm. The LP filter coefficients are converted to Line Spectral Pair (LSP) coefficients. LSP coefficients are converted back to the LP filter coefficients, which is just the reverse process of the conversion from LP to LSP. This module is exactly what the decoder will need in order to convert the LSP coefficients to LP coefficients. We decided not to implement the LSF quantization module because we did not have the codebook information when we designed our system.
The open-loop pitch delay is calculated first for each frame. Then the closed-loop pitch Platform: |
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Author:coco |
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Description: 这个包实现了ITU - T的G.723.1语音编码器和解码器在Matlab。该方案的目标是提供一个良好的记录和模块化设计方案，实验和研究，以方便使用为基础的实际编码器。
编码器实现了G.723.1的多脉冲模式（在6.3 kb / s的运行）。解码器可以解码的5.3 kb / s的，在6.3 kb的多脉冲/秒，连续传输，数据包丢失隐藏）编码器（所有的ACELP方式。
该编码器和解码器之间的标准接口是位文件（同位文件由ITU - T参考代码产生兼容）。第二个选项之间传递的编码器和解码器使用Matlab的数据信息文件。此选项允许测试通过传递量化或unquantized之间的编码器和解码器的信息。
有报道[1]描述了G.723.1编码与Matlab实现与分布包括在内。 ITU - T建议G.723.1的[2]在线提供。该建议含-This package implements the ITU-T G.723.1 speech coder and decoder in Matlab. The goal of the package is to provide a well-documented and modular program that was designed to facilitate experimentation and research using a practical coder as a base.
The coder implements the multipulse mode of G.723.1 (running at 6.3 kb/s). The decoder can decode all modes of the coder (ACELP at 5.3 kb/s, multipulse at 6.3 kb/s, discontinuous-transmission, packet loss concealment).
The standard interface between the coder and decoder is a bit file (compatible with the bit files generated by the ITU-T reference code). A second option passes information between the coder and decoder using a Matlab data file. This option allows for testing by passing quantized or unquantized information between the coder and the decoder.
A report [1] describing the G.723.1 and the Matlab implementation is included with the distribution. ITU-T Recommendation G.723.1 [2] is available on-line. The recommendation incl Platform: |
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Author:zaaa |
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Description: ITU-T G.729 Source codeITU-T G.729 Annex B ANSI-C Source CodeVersion 1.4 Last modified: November, 2000 */TITLE-----Fixed-point description of Recommendation G.729 with ANNEX BCoding of Speech at 8 kbit/s using Conjugate-StructureAlgebraic-Code-Excited Linear-Prediction (CS-ACELP) withVoice Activity Decision(VAD), Discontinuous Transmission(DTX), and Comfort Noise Generation(CNG).SOFTWARE AND INTELLECTUAL PROPERTY----------------------------------This software package is provided as part of ITU-T Recommendation G.729B.Copyright (c) 1996, AT&T, France Telecom, Lucent Technologies, NTT, Rockwell International, Universite de Sherbrooke.All rights reserved.The copy of the source C code, version 1.4, is given under Copyright of the authors, only for the purpose of establishing the specification of a codec.VERSION-------This is version 1.4.-ITU-T G.729 Source codeITU-T G.729 Annex B ANSI-C Source CodeVersion 1.4 Last modified: November, 2000*/TITLE-----Fixed-point description of Recommendation G.729 with ANNEX BCoding of Speech at 8 kbit/s using Conjugate-StructureAlgebraic-Code-Excited Linear-Prediction (CS-ACELP) withVoice Activity Decision(VAD), Discontinuous Transmission(DTX), and Comfort Noise Generation(CNG).SOFTWARE AND INTELLECTUAL PROPERTY----------------------------------This software package is provided as part of ITU-T Recommendation G.729B.Copyright (c) 1996, AT&T, France Telecom, Lucent Technologies, NTT, Rockwell International, Universite de Sherbrooke.All rights reserved.The copy of the source C code, version 1.4, is given under Copyright of the authors, only for the purpose of establishing the specification of a codec.VERSION-------This is version 1.4. Platform: |
Size: 115712 |
Author:丁一 |
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Search - speech code using acelp