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Description: 4.8 Kbps CELP Coder
Each frame is divided into 4 subframes. In each subframe, the codebook contains 512 codevectors.
The gain is quantized using 5 bits per subframe.
The LSP parameters are quantized using 34 bits similar to the LPC Vocoder
Platform: |
Size: 198656 |
Author: 黄豈荣 |
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Description: 为了满足数字通信及其它商业应用的需求，语音压缩编码技术得到了迅速发展。介绍了目前语音压缩编码技术
的研究进展，主要包括连续可变斜率增量调制(CVSD)、小波分析、多脉冲激励线性预测编码、散布脉冲码激励线性预
测(DP-CELP)、多重脉冲散布非均匀代数码本激励线性预测(MPD-USACELP)、波形内插(Ⅷ)、线谱对(频率)(LSP)的量化-In order to satisfy deman凼of the digital communication and other commercial applicatiOils，
the speech compression technology has been developed rapidly．The present research progress in speech
compression technology is introduced in this paper including CVSD， wavelet analysis and its application
to speech coding，MPLPC，DP-CELP，MPD-USACELP，Ⅷand quantification of LSF．These algorithins
Platform: |
Size: 309248 |
Author: 杨亚欣 |
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Description: 语音CELP压缩解压源代码（C语音)- Pronunciation CELP compression decompression source code (C pronunciation) -
* 4800 bps CELP Characteristics
*
* Spectrum Pitch Code Book
* ------------- --------------- -----------------
* Update 30 ms 30/4 = 7.5 ms 30/4 = 7.5 ms
* ll=240 lp=60 l=60
*
* Order 10 256 (max) x 60 512 (max) x 60
* 1 gain 1 gain
*
* Analysis Open loop Closed loop Closed loop
* Correlation Modified MSPE MSPE VQ
* 30 ms Hamming VQ, weight=0.8 weight=0.8
* no preemphasis range 20 to 147 shift by 2
* 15 Hz BW exp (w/ fractions) 77 sparsity
*
* Bits per 34 indep LSP index: 8+6+8+6 index: 9*4
* Frame [3444433333] gain(-1,2): 5*4 gain(+/-): 5*4
*
* Bit Rate 1133.3 bps 1600 bps 1866.67 bps
*
* NOTE: The remaining 200 bps are used as follows: 1 bit per frame
* for synchronizatio
Platform: |
Size: 109568 |
Author: lcd |
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