A simple problem in Wave Generation

[Dirichlet123]

Hi there,

              I am new to LabVIEW. 

              I just want to generate a wave whose frequency is higher than fs/2 using the signal Generation VI and take 10 samples.

When I raised the frequency above 500Hz, the Generator on the top refused to work, giving me an erro.

Could anyone give me a hand?

Thanks in advance.

[Norbert_B]

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@Dirichlet123 wrote:

[...]whose frequency is higher than fs/2 [...]

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Ever heared of Nyquist theorem? If not, read about it. It explains the background and is a physical constraint.

Be glad that the waveform generation VI prevents you from trying by throwing an error.

Norbert

[Dirichlet123]

Uhm... I did know that. I intended to violate the Nyquist theorem to see the aliasing.

I just want to take 10 discrete samples from the underlying signal. Thanks anyway!

[Norbert_B]

To see aliasing, you have to "acquire" a signal. What you can do:

Create a signal with higher frequency and the use "resampling" breaking Nyquist.

Norbert

[Dirichlet123]

Thanks, it works. But is there a way to generate an array consisting 10 samples regardless of what sampling frequency I use?

Say I have a analog signal y=sin(2*pi*f0*t) ,I take 10 samples using the sampling frequency fs, so the outputs are y[k]=sin(2*pi*f0*k/fs).