mirror of
https://github.com/This-weiyuqing/ECGTest.git
synced 2026-10-18 11:14:07 +08:00
151 lines
5.8 KiB
Matlab
151 lines
5.8 KiB
Matlab
clc; clear all;
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%------ SPECIFY DATA ------------------------------------------------------
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%%选择文件名称
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stringname='111';
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%选择你要处理的信号点数
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points=10000;
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PATH= 'W:\ecgmalab\data'; % path, where data are saved 记得更改此path
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HEADERFILE= strcat(stringname,'.hea'); % header-file in text format
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ATRFILE= strcat(stringname,'.atr'); % attributes-file in binary format
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DATAFILE=strcat(stringname,'.dat'); % data-file
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SAMPLES2READ=points; % number of samples to be read
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% in case of more than one signal:
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% 2*SAMPLES2READ samples are read
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%------ LOAD HEADER DATA --------------------------------------------------
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fprintf(1,'\\n$> WORKING ON %s ...\n', HEADERFILE);
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signalh= fullfile(PATH, HEADERFILE);
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fid1=fopen(signalh,'r');
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z= fgetl(fid1);
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A= sscanf(z, '%*s %d %d %d',[1,3]);
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nosig= A(1); % number of signals
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sfreq=A(2); % sample rate of data
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clear A;
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for k=1:nosig
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z= fgetl(fid1);
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A= sscanf(z, '%*s %d %d %d %d %d',[1,5]);
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dformat(k)= A(1); % format; here only 212 is allowed
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gain(k)= A(2); % number of integers per mV
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bitres(k)= A(3); % bitresolution
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zerovalue(k)= A(4); % integer value of ECG zero point
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firstvalue(k)= A(5); % first integer value of signal (to test for errors)
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end;
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fclose(fid1);
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clear A;
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%------ LOAD BINARY DATA --------------------------------------------------
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if dformat~= [212,212]
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error('this script does not apply binary formats different to 212.');
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end
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signald= fullfile(PATH, DATAFILE); % data in format 212
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fid2=fopen(signald,'r');
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A= fread(fid2, [3, SAMPLES2READ], 'uint8')'; % matrix with 3 rows, each 8 bits long, = 2*12bit
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fclose(fid2);
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%% 移位操作，得到相邻两个信号的高4 位
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%对第二字节做右位移运算，位移距离4
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%得到第二字节左四位，即sign2 的高四位
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M2H= bitshift(A(:,2), -4);
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%对第二字节和00001111 做与运算，
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%保留第二字节右四位，即sign1 的低四位，包括符号位,左高信息
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M1H= bitand(A(:,2), 15);
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%对第二字节和00001000 做与运算，
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%保留第二字节右边第四位，获取sign2 符号位,并向左位移九位，与整体sign1 进行运算
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PRL=bitshift(bitand(A(:,2),8),9); % sign-bit
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%对第二字节和10000000 做与运算，
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%保留第二字节右边第四位，获取sign1 符号位，并向左位移5 位，与整体sign2 进行运算
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PRR=bitshift(bitand(A(:,2),128),5); % sign-bit
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%计算两个信号的幅值
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M( : , 1)= bitshift(M1H,8)+ A(:,1)-PRL;
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M( : , 2)= bitshift(M2H,8)+ A(:,3)-PRR;
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if M(1,:) ~= firstvalue, error('inconsistency in the first bit values'); end;
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switch nosig
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case 2
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M( : , 1)= (M( : , 1)- zerovalue(1))/gain(1);
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M( : , 2)= (M( : , 2)- zerovalue(2))/gain(2);
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TIME=(0:(SAMPLES2READ-1))/sfreq;
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case 1
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M( : , 1)= (M( : , 1)- zerovalue(1));
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M( : , 2)= (M( : , 2)- zerovalue(1));
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M=M';
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M(1)=[];
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sM=size(M);
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sM=sM(2)+1;
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M(sM)=0;
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M=M';
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M=M/gain(1);
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TIME=(0:2*(SAMPLES2READ)-1)/sfreq;
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otherwise % this case did not appear up to now!
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% here M has to be sorted!!!
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disp('Sorting algorithm for more than 2 signals not programmed yet!');
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end;
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clear A M1H M2H PRR PRL;
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fprintf(1,'\\n$> LOADING DATA FINISHED \n');
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%------ LOAD ATTRIBUTES DATA ----------------------------------------------
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atrd= fullfile(PATH, ATRFILE);
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% attribute file with annotation data
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fid3=fopen(atrd,'r');
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A= fread(fid3, [2, inf], 'uint8')';
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fclose(fid3);
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ATRTIME=[];
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ANNOT=[];
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sa=size(A);
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saa=sa(1);
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i=1;
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while i<=saa
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annoth=bitshift(A(i,2),-2);
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if annoth==59
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ANNOT=[ANNOT;bitshift(A(i+3,2),-2)];
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ATRTIME=[ATRTIME;A(i+2,1)+bitshift(A(i+2,2),8)+...
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bitshift(A(i+1,1),16)+bitshift(A(i+1,2),24)];
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i=i+3;
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elseif annoth==60
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% nothing to do!
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elseif annoth==61
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% nothing to do!
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elseif annoth==62
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% nothing to do!
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elseif annoth==63
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hilfe=bitshift(bitand(A(i,2),3),8)+A(i,1);
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hilfe=hilfe+mod(hilfe,2);
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i=i+hilfe/2;
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else
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ATRTIME=[ATRTIME;bitshift(bitand(A(i,2),3),8)+A(i,1)];
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ANNOT=[ANNOT;bitshift(A(i,2),-2)];
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end
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i=i+1;
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end
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ANNOT(length(ANNOT))=[]; % last line = EOF (=0)
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ATRTIME(length(ATRTIME))=[]; % last line = EOF
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clear A;
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ATRTIME= (cumsum(ATRTIME))/sfreq;
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ind= find(ATRTIME <= TIME(end));
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ATRTIMED= ATRTIME(ind);
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ANNOT=round(ANNOT);
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ANNOTD= ANNOT(ind);
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%------ DISPLAY DATA ------------------------------------------------------
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figure(1); clf, box on, hold on ;grid on ;
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plot(TIME, M(:,1),'r');
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if nosig==2
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plot(TIME, M(:,2),'b');
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end
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for k=1:length(ATRTIMED)
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text(ATRTIMED(k),0,num2str(ANNOTD(k)));
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end
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xlim([TIME(1), TIME(end)]);
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xlabel('Time / s'); ylabel('Voltage / mV');
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string=['ECG signal ',DATAFILE];
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title(string);
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fprintf(1,'\\n$> DISPLAYING DATA FINISHED \n');
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% -------------------------------------------------------------------------
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fprintf(1,'\\n$> ALL FINISHED \n'); |