clear
%用于提取正常开门声音的特征信号
for i=1:40
tic
dir='sound\zheng';
dir=[dir,num2str(i)];
dir=[dir,'.mat'];
load(dir); %加载外部数据
abs_y=abs(y); %取绝对值
[M,N]=size(y);
SUM=abs_y(1);
MAX=abs_y(1);
for j=2:M
SUM=SUM+abs_y(j); %求和
if MAX<abs_y(j)
MAX=abs_y(j);
end
end
%构造结构数组
character_intime(i).SUM=SUM; %时域中的总和
character_intime(i).average=SUM/M;%时域中的平均值
character_intime(i).MAX=MAX;%时域中的最大值
fft_y=abs(fft(y)); %快速傅里叶变换
[M,N]=size(fft_y);
SUM=fft_y(1);
MAX=fft_y(1);
for j=2:M
SUM=SUM+fft_y(j); %求和
if MAX<fft_y(j)
MAX=fft_y(j);
end
end
%构造结构数组
character_infrequency(i).SUM=SUM; %频域中的总和
character_infrequency(i).average=SUM/M;%频域中的平均值
character_infrequency(i).MAX=MAX;%频域中的最大值
toc
i
end
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