The 4.0 kbit/s speech codec described in this paper is based on a
Frequency Domain Interpolative (FDI) coding technique, which
belongs to the class of prototype waveform Interpolation (PWI)
coding techniques. The codec also has an integrated voice
activity detector (VAD) and a noise reduction capability. The
input signal is subjected to LPC analysis and the prediction
residual is separated into a slowly evolving waveform (SEW) and
a rapidly evolving waveform (REW) components. The SEW
magnitude component is quantized using a hierarchical
predictive vector quantization approach. The REW magnitude is
quantized using a gain and a sub-band based shape. SEW and
REW phases are derived at the decoder using a phase model,
based on a transmitted measure of voice periodicity. The spectral
(LSP) parameters are quantized using a combination of scalar
and vector quantizers. The 4.0 kbits/s coder has an algorithmic
delay of 60 ms and an estimated floating point complexity of
21.5 MIPS. The performance of this coder has been evaluated
using in-house MOS tests under various conditions such as
background noise. channel errors, self-tandem. and DTX mode
of operation, and has been shown to be statistically equivalent to
ITU-T (3.729 8 kbps codec across all conditions tested.
资源简介：The 4.0 kbit/s speech codec described in this paper is based on a Frequency Domain Interpolative (FDI) coding technique, which belongs to the class of prototype waveform Interpolation (PWI) coding techniques. The codec also has an integrate...
上传时间： 2018-04-08
上传用户：kilohorse
资源简介：基于TM1300的嵌入式网络视频编码器的设计
上传时间： 2013-12-26
上传用户：caozhizhi
资源简介：是MATLAB关于c\c++的使用和应用（英文）。
上传时间： 2013-12-16
上传用户：cazjing
资源简介：基于凌阳单片机的简易语音数字频率计源码.实验了语音播报测量的频率,幅度值等.
上传时间： 2014-09-06
上传用户：jiahao131
资源简介：一种基于多项式插值改进的亚像素细分算法 文中对传统的sobel进行了8个方向的扩展
上传时间： 2016-09-17
上传用户：zwei41
资源简介：数值分析的实验文档和源程序 包含 1.样条插值 2.非线性方程求根 3.函数逼近和拟合 4.矩阵特征值计算 5.舍入误差分析 程序在相应文档中
上传时间： 2016-12-17
上传用户：fanboynet
资源简介：基于MELP的水下实时语音通信机的研究与实现
上传时间： 2013-11-08
上传用户：1966649934
资源简介：1）动态加载中间（2）规范化中间层接口 （3）解释本地文件系统（4）基于数据库的数据提供（5）数据库设计（6）优化数据提供逻辑（7）程序框架结构图
上传时间： 2015-03-25
上传用户：CHINA526
资源简介：用C语言来实现的。牛顿插值法对一些函数作近似的替代，是N个节点数的插值函数。
上传时间： 2013-12-31
上传用户：lo25643
资源简介：三弯矩插值法 lagrange多项式插值 多项式最小二乘法 龙贝格积分法 分段线性插值 三转角插值 这些是数值分析中常用的集中经典方法，运用matlab展示出来！
上传时间： 2015-05-02
上传用户：vodssv
