Abstract
The signal processing available in digital storage oscilloscopes (DSOs) takes one of the two basic forms: pre-processing and post processing. Pre-processing takes place at acquisition time while post processing is performed upon the stored data in the display memory. Another distinction is between processing which is applied on a per channel basis, and processing that inherently involves two channels. Averaging and smoothing are important techniques as they can both reduce the effect of noise accompanying the wanted signal and improve the signal to noise ratio. Averaging is used for reducing noise on multiple acquisitions. Smoothing can also be used with repetitive acquisitions, but it acts on each acquired waveform independently. Therefore, unlike averaging, it can be used on a single shot acquisition.
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