how can i get back the original song into the program below?

Question

parthasarathi ghorai 2015-5-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/216825-how-can-i-get-back-the-original-song-into-the-program-below

关闭： MATLAB Answer Bot 2021-8-20

partha.m

[y,fs]=wavread('khuddar.wav');
a=zeros(100,2);
j=1;
for i=round(rand(1)*(10000-1)+1):round(rand(1)*(10000-1)+1)
    a(j,:)=y(i,:);
    j=j+1;
end
mi=min(a);
ma=max(a);
dif=ma(1,:)-mi(1,:);
c=dif(1)/255;
a=mi;
b=a+c;
x=zeros(255,2);
for i=1:255
    x(i,:)=a;
    a=a+c;
end
s=0;
for i=1:10
    s=s+x(i,:);
end
a=s
 z=0;
 for(i=10:20)
     z=z+x(i,:);
 end
 b=z
 A=0;
 for(i=20:30)
     A=A+x(i,:);
 end
 c=A
 B=0;
 for(i=30:40)
     B=B+x(i,:);
 end
 d=B
C=0;
 for(i=40:50)
     C=C+x(i,:);
 end
 e=C
 D=0;
 for(i=50:60)
     D=D+x(i,:);
 end
 m=D
 E=0;
 for(i=60:70)
     E=E+x(i,:);
 end
 g=E
 F=0;
 for(i=70:80)
     F=F+x(i,:);
 end
 h=F
 G=0;
 for(i=80:90)
     G=G+x(i,:);
 end
 n=G
 H=0;
 for(i=90:100)
     H=H+x(i,:);
 end
 j=H
transfromed=fft(y);
f=abs(transfromed);
plot(f)
x=find(y<=20);
y(x);
y(x(1))=a(1);
y(x(2))=b(1);
 y(x(3))=c(1);
 y(x(4))=d(1);
 y(x(5))=e(1);
 y(x(6))=m(1);
 y(x(7))=g(1);
 y(x(8))=h(1);
 y(x(9))=n(1);
 y(x(10))=j(1);
 y(1:10)
   plot(y)

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Answer 1

Walter Roberson 2015-5-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/216825-how-can-i-get-back-the-original-song-into-the-program-below#answer_179277

You cannot. You overwrite the first 10 locations in the first channel of y without having saved the previous contents. They are gone and cannot be recovered except by reading in the file again.

The rest of the song after the 10th entry is still there untouched in y(11:end,:), and any channel beyond the first is untouched.