How to define SNR of tonal component?

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cydi

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How do we define the SNR of a sinusoid, when the bandwidth of interest is of the order of a few kHz? Is it possible to measure using FFT techniques? Or for a real world signal, using a DSA?
 

you can use a FFT. How do you plan to measure the noise?
BRM
 

As i have mentioned, using a spectrum analyser. There comes the confusion with bandwidth. Nois is over a specific band. Tonal for single freq....
 

sine power is detereministic. So if you happen to know the amplitude of the sine, you can find its power (v^2/2). Assume noise is additive. Find total power of the captured signal by squaring, summing and averaging over all samples. Subtract away the calculated sine power. Will this work?
-b

Added after 46 seconds:

sine power is detereministic. So if you happen to know the amplitude of the sine, you can find its power (v^2/2). Assume noise is additive. Find total power of the captured signal by squaring, summing and averaging over all samples. Subtract away the calculated sine power. Will this work?
-b
 

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