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Old Aug 28, 2008, 10:13 PM   #11
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Thanks folks, looks like it is a positive step towards increased SNR. I will wait for G10 to try it.

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Old Aug 29, 2008, 8:10 AM   #12
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TCav wrote:
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No. This is the averaging in hardware. It increases the signal to noise ratio, but it doesn't increase the signal.
...
True, though increasing the SNR does means that more amplification can be done without noise becoming dominate. In effect increasing the signal. Averaging is very old, very standard method of extracting a signal from noise.

Or looking at it another way, consider totaling the signal from different sensors. That will mean an increased signal from each of the smaller number of psuedosensors. Since the noise is random, some will subtract, some will add so the noise will increase at the rate of the square root of the ratio of psuedosensor/sensor while the signal will increase a the rate of the ratio. So the SNR will increase at the rate of the square root.

It is also true that averaging does not increase the number of photons reaching the sensor. Using a better sensor also does not increase the number of photons reaching it, but a better sensor does increase the signal produced by those photons. So the signal can be increased without increasing the number of photons reaching the sensor by changing the properties of the sensor.

There is a limit to how much improvement can be made, but I doubt we are anywhere near that limit.

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