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General Engineering
Confused about the Signal to Noise Ratio
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[QUOTE="tech99, post: 6051325, member: 477979"] Signal to Noise ratio, by convention, refers to power, not amplitude, so the ratio in decibels will be 10 times the log of the power ratio. The power definition removes any issue about the wave shape. If we use amplitude, there is a problem when the noise is statistical and the signal is sinusoidal. (In any case, for amplitude we need to take 20 times the log of the amplitudes, not 10 times). With amplitude, there is also a complication where the signal source is not matched to a noisy receiver, because the decibel definition for amplitudes presumes equal impedances,. It is also common to really mean Signal+Noise / Noise ration, as a pure signal is not usually obtainable in practice. [/QUOTE]
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Engineering
General Engineering
Confused about the Signal to Noise Ratio
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