Struct contents reference from a non-struct array object

2019 3 26
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更新时间：2019 3 26
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L=10000;
fs=48000;
[y,fs] = audioread('pp.wav');
left_channel = y(:,1);
right_channel = y(:,2);
b = left_channel - right_channel;
x_noise=b.val(1,1:L)/200;
and i'm getting 'Struct contents reference from a non-struct array object' error in line "x_noise=b.val(1,1:L)/200;". Please tell me the solution.

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