Real-time data acquisition and data plot problem

I' ve been having problems to acquire data and plot it in real time. I' ve been able to plot a graph that has a moving x-axis with the help of function drawnow nd by translating the x-axis with the help of function xlim. Now I' ve been wondering if there is a way to read acquisited data one by one (bite per bite), and to plot it in real - time using the same method. Also I' m wondering if the same method could be aplied to generate a signal and send it to an analog output(example winsound), but to make it go outside bit by bite.

function pushbutton3_Callback(hObject, eventdata, handles)

 handles.StopGenSignal = 0;
 guidata(hObject,handles);
amp=str2double(get(handles.edit7,'String'));
frek=str2double(get(handles.edit6,'String'));

% ao=analogoutput('winsound');
% addchannel(ao,1);
% set(ao,'StandardSampleRates',8000);
% set(ao,'TriggerType','Immediate');
% set(ao,'SampleRate',2*8000);
h=animatedline;
xlabel('Vrijeme [sec]');
ylabel('Amplituda [V]');
title('Generisani signal');
%axis([0 3 -amp-1 amp+1]);
%set(gca,'XLim','auto','YLim',[-amp-1 amp+1]);
axis([0 3 -amp-1 amp+1]);
grid on;
t=0;

while handles.StopGenSignal==0
    y=amp*sin(2*pi*frek*t);
    %putdata(ao,y);
   
    if(t>3)
      axis([t-2.9 t+0.1 -amp-1 amp+1]);
    end
    addpoints(h,t,y);
    drawnow
    pause(0.01);
    t=t+0.01;
    handles = guidata(hObject);
end

function pushbutton5_Callback(hObject, eventdata, handles)
 handles.StopGenSignal = 1;
 guidata(hObject,handles);
 
 

The given code represents the generated signal, my question is whether there is a way to make an analogoutput object (or analog input) and to send data (or recieve) data bite per bite (with a refresh period) so that I can use the same metod as in the shown while loop to plot date in real time, and to send it to winsound (or mcc). Thanks in advance.

Answer 1

[Benjamin Thompson]

If the frequency of the signal is maybe 50 Hz or less it might look OK. Windows and Linux processes typically can only handle events every 10-15 ms. For higher sampling rates and more precise timing you need hardware that buffers data for receiving in Windows or for displaying.