Why my calculation result is not matrix result？

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ZHU z 2022-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1692870-why-my-calculation-result-is-not-matrix-result

评论： ZHU z 2022-4-13

123.zip

The result of my matla calculation is a numerical value instead of a matrix result, so I can't draw the relevant graph(figure3)：

——The output of AweightedSPL and SPL is a numerical rather than a matrix result,So I can't plot the "frequency-AweightedSPL "spectrum. Input audio has been uploaded

can someone help me see where the code can go wrong?How should I change it?

thanks~

[x,fs] = audioread('123.wav'); 
L = length(x);
y=fft(x); 
f  =fs/2.*linspace(0,1,L/2+1);
y = y(1:L/2+1);
plot(f,abs(y),'b'); 
A= filterA(f);
yweighted = A'.*y; 
figure(1);
plot(f,abs(yweighted),'r');
xweighted = ifft(yweighted);
xweighted = real(xweighted); 
tempdata = xweighted;
tempL = length(tempdata);
temp1 = fft(tempdata)/tempL*2;
figure(2);
plot(f,abs(temp1),'g');
linelevel =1.8;
preampout = abs(xweighted.*1.8);
preampin = preampout;
pressure = 1000.*preampin./22.78;
pref = 0.00002;
pressure = sqrt(mean(pressure.^2));
AweightedSPL  =20.*log10(pressure/pref);
figure(3);
plot(f,AweightedSPL,'b');grid