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# What is the difference between CNR and SNR ?

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CNR and SNR

what is CNR and SNR?their differences?how to measure them?

Re: CNR and SNR

Carrier to Noise Ratio (CNR) is a measure of the received carrier strength relative to the strength of the received noise.

CNR[dB] = 10 log10(Pc/Pn)
where
Pc - incoming carrier strength in microwatts
Pn - noise level in microwatts

Signal to Noise Ratio (SNR), is a measure of signal strength relative to background noise.

SNR[dB] = 20 log10(Vs/Vn)
where
Vs - incoming signal strength in microvolts
Vn - noise level in microvolts

Re: CNR and SNR

Why CNR use 10log10(xxx) but SNR use 20log10(xxx) ??

vfone said:
Carrier to Noise Ratio (CNR) is a measure of the received carrier strength relative to the strength of the received noise.

CNR[dB] = 10 log10(Pc/Pn)
where
Pc - incoming carrier strength in microwatts
Pn - noise level in microwatts

Signal to Noise Ratio (SNR), is a measure of signal strength relative to background noise.

SNR[dB] = 20 log10(Vs/Vn)
where
Vs - incoming signal strength in microvolts
Vn - noise level in microvolts

Re: CNR and SNR

Because in this case one uses ratio of powers, and other ratio of voltages.

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