mirror of
https://github.com/This-weiyuqing/ECGTest.git
synced 2026-10-18 11:14:07 +08:00
43 lines
1.4 KiB
Matlab
43 lines
1.4 KiB
Matlab
%*********************去除噪声和基线漂移*********************%
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level=8;
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wavename='bior2.6';
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ecgdata=M(:,1);
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figure(2);
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plot(ecgdata(1:points));grid on ;axis tight;axis([1,points,-2,5]);
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title('原始ECG 信号');
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%%%%%%%%%%进行小波变换8 层
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[C,L]=wavedec(ecgdata,level,wavename);
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%%%%%%%提取近似系数，
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A1=appcoef(C,L,wavename,1);
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A2=appcoef(C,L,wavename,2);
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A3=appcoef(C,L,wavename,3);
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A4=appcoef(C,L,wavename,4);
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A5=appcoef(C,L,wavename,5);
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A6=appcoef(C,L,wavename,6);
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A7=appcoef(C,L,wavename,7);
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A8=appcoef(C,L,wavename,8);
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%%%%%%%提取细节系数
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D1=detcoef(C,L,1);
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D2=detcoef(C,L,2);
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D3=detcoef(C,L,3);
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D4=detcoef(C,L,4);
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D5=detcoef(C,L,5);
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D6=detcoef(C,L,6);
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D7=detcoef(C,L,7);
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D8=detcoef(C,L,8);
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%%%%%%%%%%%%重构
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A8=zeros(length(A8),1); %去除基线漂移,8 层低频信息
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RA7=idwt(A8,D8,wavename);
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RA6=idwt(RA7(1:length(D7)),D7,wavename);
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RA5=idwt(RA6(1:length(D6)),D6,wavename);
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RA4=idwt(RA5(1:length(D5)),D5,wavename);
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RA3=idwt(RA4(1:length(D4)),D4,wavename);
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RA2=idwt(RA3(1:length(D3)),D3,wavename);
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D2=zeros(length(D2),1); %去除高频噪声，2 层高频噪声
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RA1=idwt(RA2(1:length(D2)),D2,wavename);
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D1=zeros(length(D1),1);%去除高频噪声，1 层高频噪声
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DenoisingSignal=idwt(RA1,D1,wavename);
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figure(3);
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plot(DenoisingSignal);
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title('去除噪声的ECG 信号'); grid on; axis tight;axis([1,points,-2,5]);
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clear ecgdata; |