Constant OverLap-Add
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短时傅立叶变换
- w(n) - Window function, length M.
- R - Hop size
为使
窗函数w(n)满足Constant OverLap-Add, COLA。
测试代码:(Scilab 5.0.2)
//
// COLA
//
M=32; // Window length
R=M/2; // Hop size
N=3*M; // Overlap-Add span
wbar=window('hm',M+1);
w=wbar(1:M); // Window function with endpoint removed, similar to Matlab function hamming(M, 'periodic')
s=zeros(1,N);
wzp=zeros(1,N);
f=scf(0);
for so=0:R:N-M
ndx=so+1:so+M;
s(ndx)=s(ndx)+w;
wzp(ndx)=w;
plot2d(0:N-1,wzp, style=color('red'));
end
scf(f);
plot2d(0:N-1,s, style=color('blue'));
set(f,'Figure_name','COLA');
a=gca();
a.grid=[1,1]*color('gray');
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