How i enter the ECG signal to the lab view through the sound card

first i open the help and find example the display the signal of the mic
and i enter the ECG signal through the mic and displaied
but when displaied the ECG appearied only one period on the chart so on if the chart with full screen you can see only one period
and when i change the x scale the signal compressed in a part of chart and the remain part of the chart empity
so how i display at least three periods of ECG
Attachments:
ECG with sound card.vi ‏20 KB
Untitled.jpg ‏37 KB

I do not have LabVIEW version 9, only 8.6
Without looking at your program can take a guess. Have you set the property "chart history length" of the graph? If you consider that an individual has a heart rate of up to 50Hz, or period of 20ms. Soon the number of points required is (3 * 20ms) / (sample time).
If this is not the problem, you could send the converted code to version 8.6 of LabVIEW?

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bhardoo wrote:
My project involves this particular detail where i have to sample a simulated sine wave and get the samples and compare them so as to select a particular length for hanning window.Then it also requires me to experiment with the window size so as to get more efficient data out of the sampled signals. please help me with the sampling part and guide me as to how to perform a hanning window operation on the sampled signal. I have directly used the spectral analysis tool which involves getting a FFT spectrum by a default hanning window setting. But since i have to experiment with the window size and variations, guide me with the sampling part and applying a separate hanning window. Thank you.
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