📄 cp3.m
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clear all;
[y1,fs,bits]=wavread('F:\noise enhancing\wav\5.wav');
y1=y1/max(abs(y1));%语音信号归一化
wavwrite(y1,8000,8,'F:\noise enhancing\voise\5.wav');
figure(1);
plot(y1);
[noise,fs1,bits1]=wavread('F:\noise enhancing\wav\5_noise.wav');
y=mixsig(y1,noise,10);% 混合
y=y/max(abs(y));%归一化
wavwrite(y,8000,8,'F:\noise enhancing\wav\mymasking_s&w.wav');%0db带噪信号
figure(2);
plot(y);
%clear all;
%[y1,fs,bits]=wavread('8k8bit.wav'); % Actual Signal
%[noise,fs1,bits1]=wavread('8k8bit_noise.wav');
%y=mixsig(y1,noise, 10);
%wavwrite(y,8000,8,'f:\a\mymasking_s&w.wav');
%figure(1);
%plot(y);
frame = 256; % Defining frame size
%for k = 1:2560, % Loop for first 50 frames(0.5 seconds) of noise
% y_temp(k) = y(k);
%end;
shift=128;
win=hamming(256);
%a=length(y),a=18800
for j1 = 1:length(y),
signal(j1) = y(j1);
end;
ps_noise=zeros(length(signal)/frame,frame);
frame_temp = zeros(length(signal)/frame,frame);
%length1 = length(y_temp); % length of the noise samples(first 4000 samples)
%ps_noise = zeros(length1/frame,frame);
%frame_temp = zeros(length1/frame,frame);
%hh = 0;
% for k = 1 : length1/frame,
% for l = 1 : frame,
% b(l) = y_temp(hh+l);
% end;
% hh = hh + frame;
% frame_temp(k,1:frame) = fft(b); %fft for the first 50 frames
% ps_noise(k,1:frame) = (frame_temp(k,1:frame).*conj(frame_temp(k,1:frame)))/frame;
% A(1,k) = (sum(ps_noise(k,1:frame))); % Sum of the power spectral densities of samples within a frame
% end;
%threshold = sum(A)*frame/length1; % setting the threshold for the noise(frame noise)
hh = 0;
for k = 1 : 5,
for l = 1 : frame,
b(l) = signal(hh+l);
end;
hh = hh + frame;
frame_temp(k,1:frame) = abs(fft(b)); %fft for the first 50 frames
ps_noise(k,1:frame) = (frame_temp(k,1:frame).*conj(frame_temp(k,1:frame)))/frame;
%ps_noise(1,1:frame)= (sum(ps_noise(1:k,l))/20); % Sum of the power spectral densities of samples within a frame
end;%语音前五真早声能量
%ps_noise=zeros(length(signal)/frame,frame);
%ps_noise(1,1:frame)= sum(A)/20; % setting the threshold for the noise(frame noise)
ps_noise(1,1:frame)= (sum(ps_noise(1:k,1:frame))/5);
%
head = 0;
mm=1;
nn=1;
% START OF THE NOISE ELIMINATION THROUGH SPECTRAL SUBTRACTION BASED ON THE THRESHOLD SET
for k = 1 : length(signal)/frame,
for m = 1 : frame,
abc1(m) = signal(head+m);
%abc1=abc1.*win';
end;
head = head +frame;
frame_temp(k,1:frame) = abs(fft(abc1));% FFT OF THE SIGNAL + NOISE FRAME BY FRAME
frame_angle(k,1:frame) = angle(fft(abc1));% ANGLE OF FFT OF THE SIGNAL + NOISE FRAME BY FRAME
ps_signal(k,1:frame) = (frame_temp(k,1:frame).*conj(frame_temp(k,1:frame)))./frame;
ps_temp=zeros(1,frame);
ps_temp(1,1:frame)=ps_signal(k,1:frame);
if k==1
ps_noise(k,1:frame)=0.98*ps_noise(1,1:frame)+0.02*ps_signal(k,1:frame);
% ps_signal(k,1:frame)=0.98*ps_signal(k,1:frame)+0.02*ps_signal(k,1:frame);
else
ps_noise(k,1:frame)=ps_noise(1,1:frame);%0.99*ps_noise(1,1:frame)+0.01*ps_signal(k,1:frame);
ps_signal(k,1:frame)=ps_signal(k,1:frame);%0.99*ps_signal(k,1:frame)+0.01*ps_noise(1,1:frame);%+0.01*ps_signal(k-1,1:frame);
end
frame_ps(1,k) = (sum(ps_signal(k,1:frame)));%一阵内信号能量之和
frame_pn(1,k)=sum(ps_noise(k,1:frame));
%ps_final(1,k) = frame_ps(1,k) - threshold;
%aa=0.8;
ps_final(1,k) = frame_ps(1,k)- 0.8*frame_pn(1,k);
%短点检测
yeta(1,k)=sum( ps_signal(k,1:frame)/(abs(ps_signal(k,1:frame)-ps_noise(k,1:frame))) );
%yeta(1,k)=frame_ps(1,k)/(frame_ps(1,k)- frame_pn(1,k));
if(yeta(1,k)>40),
ps_final(1,k) =0.1;
else
if(yeta(1,k)>1)
ps_final(1,k)=(abs(frame_ps(1,k)-frame_pn(1,k)));
else
if ps_final(1,k)< 0,
ps_final(1,k) =0.1;
else
ps_final(1,k) = ps_final(1,k);
end;
end;
end;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
T=zeros(1,256);
b=zeros(1,22);c=zeros(1,22);o=zeros(1,22);
sf=zeros(22,22);
for i1=1:3,
b(1)=b(1)+ps_signal(k,i1);
end;
for i1=4:6,
b(2)=b(2)+ps_signal(k,i1);
end;
for i1=7:10,
b(3)=b(3)+ps_signal(k,i1);
end;
for i1=11:13,
b(4)=b(4)+ps_signal(k,i1);
end;
for i1=14:16,
b(5)=b(5)+ps_signal(k,i1);
end;
for i1=17:20,
b(6)=b(6)+ps_signal(k,i1);
end;
for i1=21:25,
b(7)=b(7)+ps_signal(k,i1);
end;
for i1=26:29,
b(8)=b(8)+ps_signal(k,i1);
end;
for i1=30:35,
b(9)=b(9)+ps_signal(k,i1);
end;
for i1=36:41,
b(10)=b(10)+ps_signal(k,i1);
end;
for i1=42:47,
b(11)=b(11)+ps_signal(k,i1);
end;
for i1=48:55,
b(12)=b(12)+ps_signal(k,i1);
end;
for i1=56:64,
b(13)=b(13)+ps_signal(k,i1);
end;
for i1=65:74,
b(14)=b(14)+ps_signal(k,i1);
end;
for i1=75:86,
b(15)=b(15)+ps_signal(k,i1);
end;
for i1=87:101,
b(16)=b(16)+ps_signal(k,i1);
end;
for i1=102:118,
b(17)=b(17)+ps_signal(k,i1);
end;
for i1=119:141,
b(18)=b(18)+ps_signal(k,i1);
end;
for i1=142:170,
b(19)=b(19)+ps_signal(k,i1);
end;
for i1=171:205,
b(20)=b(20)+ps_signal(k,i1);
end;
for i1=206:246,
b(21)=b(21)+ps_signal(k,i1);
end;
for i1=247:256,
b(22)=b(22)+ps_signal(k,i1);
end;
for i1=1:22,
for j1=1:22,
sf(i1,j1)=15.81+7.5*((i1-j1)+0.474)-17.5*sqrt(1+((i1-j1)+0.474)*((i1-j1)+0.474)); %$ (18)
sf(i1,j1)=power(10,sf(i1,j1)/(20)); %$ transform from dB
end;
end;
% for j1=1:22,
% c(j1)=0;
% for i1=1:22,
% c(j1)=c(j1)+b(i1)*sf(i1,j1); %$ (19)
% end;
% end;
cc_temp=conv2(b,sf);
for i1=1:22
for j1=1:22
c(i1)=sum(cc_temp(i1,j1));
end;
end;
temp_value=0.0;
for i1=1:22,
temp_value=temp_value+b(i1);
end;
ua=temp_value/256.0;
temp_value=0;
for i1=1:256,
temp_value=temp_value+log10(ps_signal(k,i1));
end;
temp_value=temp_value/256.0;
uj=power(10,temp_value);
sfm=-10*log10(uj/ua); %$ (20)
u=min(sfm/(-60),1); %$ (21)
for i1=1:22,
O(i1)=u*(14.5+i)+(1-u)*5.5;
T(i1)=power(10,log10(c(i1))-O(i1)/10);
c(i1)=T(i1);%c[i]暂存T[i]
end;
for i1=1:3,
T(i1)=c(1);
end;
for i1=4:6,
T(i1)=c(2);
end;
for i1=7:10,
T(i1)=c(3);
end;
for i1=11:13,
T(i1)=c(4);
end;
for i1=14:16,
T(i1)=c(5);
end;
for i1=17:20,
T(i1)=c(6);
end;
for i1=21:25,
T(i1)=c(7);
end;
for i1=26:29,
T(i1)=c(8);
end;
for i1=30:35,
T(i1)=c(9);
end;
for i1=36:41,
T(i1)=c(10);
end;
for i1=42:47,
T(i1)=c(11);
end;
for i1=48:55,
T(i1)=c(12);
end;
for i1=56:64,
T(i1)=c(13);
end;
for i1=65:74,
T(i1)=c(14);
end;
for i1=75:86,
T(i1)=c(15);
end;
for i1=87:1010,
T(i1)=c(16);
end;
for i1=102:118,
T(i1)=c(17);
end;
for i1=119:141,
T(i1)=c(18);
end;
for i1=142:170,
T(i1)=c(19);
end;
for i1=171:205,
T(i1)=c(20);
end;
for i1=206:246
T(i1)=c(21);
end;
for i1=247:256,
T(i1)=c(22);
end;
%////计算绝对听阈////
mm=0.0;
for i1=1:256,
f(i1)=mm;
mm=mm+8/256;
end;
f(1)=f(2);
for i1=1:256,
%f(i1)=(3.64*power(f(i1),-0.8)-6.5*exp(-0.6*power((f(i1)-3.3),2))+0.001*power(f(i1),4));
f(i1)=3.64*(f(i1).^(-0.8))- 6.5*exp(-0.6*((f(i1)-3.3).^2))+0.001*(f(i1).^4);
end;
for i1=1:256,
T(i1)=max(T(i1),f(i1));
end;
tmax=0;
tmin=0;
for i1=1:256,
if(T(i1)>tmax)
tmax=T(i1);
end;
if(T(i1)<tmin)
tmin=T(i1);
end;
end;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%frame_ps(1,k) = (sum(ps_signal(k,1:frame)));% Sum of the power spectral densities of samples within a frame
%ps_final(1,k) = frame_ps(1,k) - threshold;% Elimination of noise from the corrupted signal
%h(1,k)=abs(ps_final(1,k)/frame_ps(1,k));
%aa=0.6;bb=2;
aa=0.7;bb=2;
h(1,k)=power(ps_final(1,k)/(ps_final(1,k)+aa*frame_pn(1,k)),bb);
frame1(k,1:frame) = h(1,k).*(frame_temp(k,1:frame));%为那滤波
for k1=1:256,
%ps_noise[k]=0.98*ps_noise[k]+0.02*ps_signal[k];
alfa(k1)=(tmax*6-T(k1)*6+1*T(k1)-1*tmin)/(tmax-tmin);
beita(k1)=(tmax*0.02-T(k1)*0.02+0*T(k1)-0*tmin)/(tmax-tmin);
% temppow=threshold/256/abs(frame1(k,k1));
temppow=abs(ps_noise(k,k1))/abs(frame1(k,k1));
if(power(temppow,2)<(1.0/(alfa(k1)+beita(k1))))
%if(1-alfa[k]*pow(temppow,2)>0)
frame1( k,k1)=sqrt(power(1-alfa(k1)*power(temppow,2),0.5))*frame1(k,k1);
else
frame1(k,k1)=sqrt(power(beita(k1)*power(temppow,2),0.5))*frame1(k,k1);
end;
end;
frame1(k,1:frame) = frame1(k,1:frame).*(exp(i*frame_angle(k,1:frame)));
frame2(k,1:frame)=ifft(frame1(k,1:frame));
signal(1,(((k-1)*frame)+1):(k*frame)) = frame2(k,1:frame); % Retriving back the signal(after spectral subtraction)
end;
signal((length(y)-1000):(length(y)))=[]; %give up 4 frames in the end
y1((length(y1)-1000):(length(y1)))=[];
figure(3);
plot(1:length(frame_ps),frame_ps,1:length(ps_final),ps_final);
figure(4);
signal=signal';
signal=signal/max(abs(signal));%归一化
plot(1:length(signal),signal);
%以下画语谱图
%map=(log10(1:0.1:10))';
%map=[map map map ];
%subplot(2,2,1)
%spgrambw( noise,8000);title('noise Specgram');colormap(1-map);
%subplot(2,2,2)
%spgrambw(y1,8000);title('sig Specgram');colormap(1-map);
%subplot(2,2,3)
%spgrambw(y,8000);title('mixsig Specgram');colormap(1-map);
%subplot(2,2,4)
%spgrambw(signal,8000);title('Proposed Algorithm Specgram');colormap(1-map);
%spgrambw(sig,8000);title('pure Specgram');colormap(1-map);
%[overall_snr2,seg_nr2]=snr(y1,signal)
overall_snr = 10*log10(sum(abs(y1).^2)/sum((abs(y1-signal)).^2))
wavwrite(signal,8000,8,'F:\noise enhancing\wav\mymasking21(10db).wav');⌨️ 快捷键说明
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