Recently, I heard one of my colleague said "the 16-bits ADC is enough for us, we can use 'oversampling' tech…". Finally I figured out his "oversampling tech" means to sample many many cycles (AC sampling). But I wonder if we don't improve the sample rate, what is the benefit from sampling many cycles? Can it increase the resolution of the ADC? So my question is:
- I think "oversampling" means to improve the sample rate. Right?
- What is the benefit from multiple cycle sampling?
My colleague's "oversampling" is as below:
If we want to measure 50 Hz AC signal, we set ADC's sample rate to 1000 Hz, and sample 10 cycles, that is (1000 Hz / 50 Hz) x 10 = 200 samples. If the result is not good, increase the cycles to 100, etc. Yes, he only increases the samples, but not the sample rate!