Digital oscilloscope with real-time digital signal processor.

摘要

A real-time digital signal processor (32) is capable of providing increased vertical resolution of digital input signals, including single-shot input signals. In a preferred embodiment, the digital signal processor is employed in a digital oscilloscope (10) having an analog-to-digital converter (30) that generates and delivers to the signal processor successive digital input words representing an input electrical signal during a sampling period. The signal processor selectively averages successive ones of the digital input words and delivers an averaged digital word to a waveform memory circuit (34). The process of averaging increases the vertical resolution by accumulating a sum of the digital input words. The sum contains more digits than the original digital input words. The sum is then divided by shifting to generate the averaged digital word in which the extra accumulated digits become a fractional remainder that provides the additional resolution. <IMAGE>