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数字信号处理的课程设计。题目是语音信号滤波去噪——使用双线性变换法设计的切比雪夫II型滤波器-Digital signal processing design curriculum. Topics are filtering denoising speech signals- the use of bilinear transform design Chebyshev Type II Filter
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录制一段个人的语音信号,并对录制的信号进行采样;画出采样后语音信号的时域波形和频谱图;给定滤波器的性能指标,采用双线性变换法和窗函数法设计滤波器,并画出滤波器的频率响应;然后用自己设计的滤波器对采集的信号进行滤波,画出滤波后信号的时域波形和频谱,并对滤波前后的信号进行对比,分析信号的变化;回放语音信号;最后,设计一个信号处理系统界面。-Record a personal voice signal, and recording the signal is sampled draw sampled
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本文简要介绍了语音信号采集与分析的发展史以及语音信号的特征、采集与分析方法,并通过PC机录制自己的一段声音,运用Matlab进行仿真分析,最后加入噪声进行滤波处理,比较滤波前后的变化。-This paper introduces the voice signal acquisition and analysis of the history and characteristics of speech signals, sampling and analysis methods, and thro
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在本文中,我们将提出一种分离语音组成部分的程序进行讨论。该程序是基于对非加性信号的非线性滤波的方法,也被称作广义线性滤波。- In this paper, a procedure for separating the components of speech is proposed and discussed. The procedure is based on an approach to nonlinear filtering of signals which have been n
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Normally speech signals are contaminated with noise and interference that reduces the intelligibility of speech during communication. In order to make speech
signals eective and useful, they need to be enhanced from the noisy speech signal.
In s
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MATLAB软件平台下,利用函数wavread对语音信号进行采样,记住采样频率和采样点数;
2)画出语音信号的时域波形,对采样后的语音进行fft变换,得到信号的频谱特性;对语音信号分别加入正弦噪声和白噪声,画出加噪信号的时域波形和频谱图;
3)根据对加噪语音信号谱分析结果,确定滤除噪声滤波器的技术指标,设计合适的数字滤波器,并画出滤波器的频域响应;
4)用所设计的滤波器对加噪的信号进行滤波,在同一个窗口画出滤波前后信号的时域图和频谱图,对滤波前后的信号进行对比,分析信号变化;
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语音信号的延时和混响
1)利用Windows下的录音机或其他软件,录制一段自己的语音信号,时间控制在1s左右,并对录制的信号进行采样;
2)语音信号的频谱分析,画出采样后语音信号的时域波形和频谱图;
3)将信号加入延时和混响,再分析其频谱,并与原始信号频谱进行比较;
4)设计几种特殊类型的滤波器:单回声滤波器,多重回声滤波器,全通结构的混响器,并画出滤波器的频域响应;
5)用自己设计的滤波器对采集的语音信号进行滤波;
6)分析得到信号的频谱,画出滤波后信号的时域波形和频谱
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用于混响背景语音分离的结构稀疏模型(Strutured sparisty model)方法-To further tackle the ambiguity
of the reflection ratios, we propose a novel formulation of the
reverberation model and estimate the absorption coefficients
through a convex optimization exploiting
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