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# Can you get the cos(n) from cos(t) signal ?

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#### purnapragna

##### Advanced Member level 4
cos from cos(t)

Hi,

is it possible to get the discrete-time signal $\cos$ from the continuous-time signal $\cos(t)$?

thnx

purna!

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cos from cos(t)

If you sample cos(t) for all integer values of t, and
store those values. you will have cos.

Re: cos from cos(t)

$\cos$ makes no sense to me! If $n$ is taking on integer values, what values do you get for $\cos$? Try it on your calculator!

On the other hand if you take a time-domain signal like $\cos(t)$ and sample it every $T_s$ seconds then you can write $\cos(n T_s)$. Note that the period of $\cos(t)$ is $2 \pi$ so you have to choose $T_s$ to be much smaller that this to have proper discritezation.

Best regards,
v_c

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Re: cos from cos(t)

hey what i mean is, is it possible to sample $\cos(t)$ to get the discrete-time signal $\cos$?

thnx

purna!

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