sample times of a product block

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Owen 2013-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/71427-sample-times-of-a-product-block

Hi,

I have to use the "Product" block as a mixer. Somehow I get this knowledge: The sample times of two inputs must not have arbitrary values or there is an error:

"Cannot determine a sample time for block Product."

It seems they must be the same or have multiple relations. Does anyone know this issue?

Thank you

Senmeis

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Honglei Chen 2013-4-10

Could you clarify your question a little more. What are the two signals you want to mix? What is the reason that they are sampled at different rate?

Owen 2013-4-11

One input comes from a signal with sample time = 5.2083e-008 (this seems strange but it is made by packetting, coding, filtering and so on), the other input is connected with a local oscillator (Sine Wave block) with a frequency = 20000000000 and a sample time = 1/80000000000.

I am not sure if the sample time of the oscillator shall depend on its own frequency or the sample time of the other input.

Senmeis

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