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Description: this document investigates on the quantization effect of implementing the adaptive algorithms for echo cancellers in fixedpoint DSP. Results show that the theoretical error is manifested at the ERLE of the canceller.-this document investigates on the quantization effect of implementing the adaptive algorithms for echo cancellers in fixedpoint DSP. Results show that the theoretical error is manifested at the ERLE of the canceller.
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Author: mocordel |
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Description: 阐述回声消除技术原理,介绍自适应回声消除器基本结构,分析两类消除回声的基本算法,并提出基于两类算法的几种改进型算法,为提高IP电话的话音质量提供一定的参考。- The element of the echo cancellation and the configuration of the adaptive echo canceller is first in troduced in this paper. It also analyzed two kinds of basical go rithms on echo cancellation , then based on which a
few improving algorithms were provided . These can
provide reference for improving speech quality on IP.
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Author: 李丽 |
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Description: This application note surveys selected echo cancellation techniques for use in TDM telephony/packet telephony applications. An echo canceller is a system encompassing many interconnected sub-blocks incorporating DSP algorithms and control operations.
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Author: Alex |
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Description: Echoes occur in telephone networks because of impedance mismatches of network elements and electro-acoustical coupling within voice terminals (telephone sets). A line/network echo canceller controls/cancels echoes caused by impedance mismatches
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Author: Alex |
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Description: The (a) section of Figure 1 illustrates the Line Echo Canceller (LEC) residing in the access network where echoes occur. Other voice processing modules, such as Automatic Level Control (ALC) and Noise Reduction (NR), are shown merely for illustration purposes. On the terminal side, both acoustic and electrical echo can occur. If the voice terminal is a speaker telephone set with an open acoustical path from the speaker to the microphone, the effect of acoustical echo is combined with the effect of the network echo. Because there is only a miniscule delay between the electrical signal and its echo, the speaker/listener is exposed to an effect known as side tone. Typically, instead of mounting a LEC at the terminal, side tone circuitry is placed to control the amount of the returned energy. The (b) section of Figure 1 shows examples of echo canceller signals representing the following:
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Author: Alex |
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Description: matlab program for echo canceller
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Size: 357376 |
Author: vk |
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Description: 程序为自适应回波抵消汇编代码，基于TI54x系列-Adaptive echo canceller assembly code based TI54x
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Size: 2048 |
Author: 周严 |
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Description: 回声对消实例，并有RLS，LMS源程序，有兴趣的可以-Echo canceller instance, and the RLS, the LMS source are interested can look at
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Size: 1117184 |
Author: liubin |
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Description: Speex 一个开源的声学回声消除器(Acoustic EEcho Cancellation) ，
-Speex open source acoustic echo canceller (Acoustic EEcho Cancellation)
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Size: 1308672 |
Author: 明白的 |
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Description: verilog hdl, quartus.64阶的简单回声抵消器，采用的是基本的LMS算法，简单改进，可用于初期了解。功能背景是对通信领域中，比如打电话时自己的声音到达对方经对方环境多径反射又传回自己这边，即回声。为将回声消除采用回声抵消装置。-64 steps a simple echo canceller is used in the basic LMS algorithm, a simple improvement, can be used for the initial understanding. Functional background in the field of communication, such as a call to reach the other environmental multipath reflections after each other and return to their side, that echo of their own voice. To echo cancellation echo cancellation device.
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Size: 40244224 |
Author: yy |
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Description: verilog写的回波抵消程序，相当于写了个回波抵消的芯片，不是dsp，可编译后下载于FPGA,绝对原创，写了很长时间。-Verilog echo canceller written procedures, wrote the equivalent of echo canceller chip, not dsp, can be downloaded from the compiled FPGA, absolute originality, writing for a long time.
-Verilog echo canceller written procedures, wrote the equivalent of echo canceller chip, not dsp, can be downloaded from the compiled FPGA, absolute originality, writing for a long time.
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Size: 4096 |
Author: gsder |
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Description: Echo canceller based on the MDF algorithm see below.
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Size: 12288 |
Author: buelahao |
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Description: 这是一篇关于回波抵消各种方法描述、分析、验证的一篇文中，讲解了LMS、nlms,等各种方法-This is an echo canceller on a variety of methods to describe, analyze, validate a text to explain the LMS, nlms, other methods
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Size: 393216 |
Author: 张远俊 |
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Description: verilog写的回波抵消程序，相当于写了个回波抵消的芯片，不是dsp，可编译后下载于FPGA,绝对原创，写了很长时间。-Verilog echo canceller written procedures, wrote the equivalent of echo canceller chip, not dsp, can be downloaded from the compiled FPGA, absolute originality, writing for a long time.
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Size: 5120 |
Author: arourd |
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Description: verilog写的回波抵消程序，相当于写了个回波抵消的芯片，不是dsp，可编译后下载于FPGA,绝对原创，写了很长时间。-Verilog echo canceller written procedures, wrote the equivalent of echo canceller chip, not dsp, can be downloaded from the compiled FPGA, absolute originality, writing for a long time.
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Size: 5120 |
Author: chaoxin |
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Description: OSLEC - A line echo canceller. This code is being developed against and partially complies with G168. Using code SpanDSP.
-OSLEC - A line echo canceller. This code is being developed against and partially complies with G168. Using code SpanDSP.
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Size: 1024 |
Author: ypjailui |
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Description: The attached source code is the implemenation of acoustic echo canceller and noise reduction.
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Size: 680960 |
Author: nana |
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Description: OSLEC - A line echo canceller. This code is being developed against and partially complies with G168. Using code SpanDSP.
-OSLEC - A line echo canceller. This code is being developed against and partially complies with G168. Using code SpanDSP.
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Size: 1024 |
Author: qfjspg |
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Description: webrtc 的回声抵消(aec、aecm)算法主要包括以下几个重要模块：1.回声时延估计 2.NLMS(归一化最小均方自适应算法) 3.NLP（非线性滤波） 4.CNG(舒适噪声产生），一般经典aec算法还应包括双端检测(DT)。考虑到webrtc使用的NLMS、NLP和CNG都属于经典算法范畴，故只做简略介绍，本文重点介绍webrtc的回声时延估计算法,这也是webrtc回声抵消算法区别一般算法(如视频会议中的算法)比较有特色的地方。-webrtc echo canceller (aec, aecm) algorithm includes the following important modules: 1 echo delay estimation 2.NLMS (normalized least mean square adaptive algorithm) 3.NLP (nonlinear filtering) 4.CNG ( comfort noise generation), usually classical aec algorithm should also include double end detector (DT). Taking into account the NLMS webrtc use, NLP and CNG belong to the category of classical algorithms, it is only a brief introduction, this article focuses on the echo time delay estimation algorithm webrtc, which is the difference between general webrtc echo cancellation algorithm algorithm (such as video conferencing in the algorithm) compare interesting places.
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Size: 573440 |
Author: xiaofeng |
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Description: echo canceller mfile
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Size: 1024 |
Author: omid |
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