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Understanding Digital Signal Processing, Third Edition by Richard G. Lyons

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Chapter Eleven. Signal Averaging

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How do we determine the typical amount, a valid estimate, or the true value of some measured parameter? In the physical world, it’s not so easy to do because unwanted random disturbances contaminate our measurements. These disturbances are due to both the nature of the variable being measured and the fallibility of our measuring devices. Each time we try to accurately measure some physical quantity, we’ll get a slightly different value. Those unwanted fluctuations in a measured value are called noise, and digital signal processing practitioners have learned to minimize noise through the process of averaging. In ...

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