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Let me put it this way. You want to filter your input signal, then what determines sample rate is the sample rate when that signal was or is converted in an ADC(originally, assuming no further up or down sampling is done) or it could be your signal is generated digitally (rather than ADC) i.e. playing an LUT in which case the sampling frequency is the clock frequency that reads LUT.
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No i'm still using NCO so the signal is generated digitally. The signal i have has a clock rate of 50Mhz, and a output frequency of 1Mhz. so does that mean it wud sample once every 50 clock cycles? i feel like the Multichannel explaination is too indepth and missing the point of my question.
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