%頻譜圖繪制
%dxt
%EI，HUST
%2008.12
clear?all
clc
[xnFsybitsy]?=?wavread（‘signalnoise.wav‘）;%讀入信號(hào)噪聲文件
y_single=xn（:1）‘;??????????????????????????%讀取一個(gè)聲道
X=fft（y_single‘）;???????????????????????????%進(jìn)行fft變換
Mag=abs（X）;?????????????????????????????????%求幅值
f=（0:length（X）-1）*Fsy/length（X）;????????????%進(jìn)行對(duì)應(yīng)的頻率轉(zhuǎn)換
subplot（311）;
plot（fMag）?????????????????????????????????%畫頻譜圖
xlabel（‘f（Hz）‘）;
ylabel（‘幅值‘）;
title（‘混有噪聲的信號(hào)頻譜‘）;

[nFsybitsy]?=?wavread（‘noise‘）;???????????%讀入噪聲文件
n_single=n（:1）‘;???????????????????????????%讀取一個(gè)聲道
X=fft（n_single‘）;???????????????????????????%進(jìn)行fft變換

Mag=abs（X）;?????????????????????????????????%求幅值
f=（0:length（X）-1）*Fsy/length（X）;????????????%進(jìn)行對(duì)應(yīng)的頻率轉(zhuǎn)換
subplot（312）;
plot（fMag‘r‘）;????????????????????????????%做頻譜圖
xlabel（‘f（Hz）‘）;
ylabel（‘幅值‘）;
title（‘噪聲頻譜‘）;

[sFsybitsy]?=?wavread（‘filter‘）;?????????%讀入濾波后的語音文件
s_single=s（:1）‘;??????????????????????????%單聲道
X=fft（5*s_single‘）;????????????????????????%進(jìn)行fft變換
Mag=abs（X）;????????????????????????????????%求幅值
f=（0:length（X）-1）*Fsy/length（X）;???????????%進(jìn)行對(duì)應(yīng)的頻率轉(zhuǎn)換
subplot（313）;
plot（fMag）????????????????????????????????%做頻譜圖
xlabel（‘頻率（Hz）‘）;
ylabel（‘幅值‘）;
title（‘濾波后的信號(hào)頻譜‘）;

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????????102??2008-12-26?15:55??備注.txt

?????文件?????236278??2008-12-26?09:26??截圖\信號(hào)和噪聲頻譜.bmp

?????文件?????236278??2008-12-26?14:41??截圖\濾波前后的語音信號(hào)1.bmp

?????文件?????236278??2008-12-26?14:49??截圖\濾波后的信號(hào)頻譜.bmp

?????文件?????236278??2008-12-26?12:35??截圖\白噪聲理想的收斂曲線圖.bmp

?????文件?????317742??2008-12-26?16:03??filter_singnal濾波后的語音信號(hào).wav

?????文件???????1348??2008-12-26?23:00??freq_analyse濾波前后頻譜分析圖.m

?????文件?????904364??2008-10-07?16:11??noise.wav

?????文件???????1869??2008-12-26?22:59??RLS.m

?????文件?????635564??2008-10-07?16:13??signalnoise.wav

?????目錄??????????0??2008-12-26?22:58??截圖

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??????????????2806319????????????????????12