Hello friends
I have a diagram of the walking gait signal related to the left and right force signal feet of people. This signal is measured by an analog to digital converter 12 bit , so the vertical axis of this diagram is in terms of voltage and the horizontal axis is in terms of the number of samples. Now I want to know how I can change the vertical axis from voltage to force(m/s^2)? (Through what code in MATLAB?)
I use this code for display signal for neurodegenerative disease in physionet site:
fileID1=fopen('control1.let','r');
A= fread(fileID1, [3, 45000], 'uint8')'; % matrix with 3 rows, each 8 bits long, = 2*12bit
fclose(fileID1);
M2H= bitshift(A(:,2), -4);
M1H= bitand(A(:,2), 15);
PRL=bitshift(bitand(A(:,2),8),9); % sign-bit
PRR=bitshift(bitand(A(:,2),128),5); % sign-bit
M( : , 1)= bitshift(M1H,8)+ A(:,1)-PRL;
M( : , 2)= bitshift(M2H,8)+ A(:,3)-PRR;
N1 = reshape(M',[90000,1]);
subplot(2,4,1);plot(N1);title('Healthy control'); ylabel('left force');
