A digital oscilloscope with configurable multiplexing digital interpolation and digital filtering functions

Abstract

The invention discloses a digital oscilloscope capable of configuring multiplex digital interpolating and digital filtering functions. The digital oscilloscope comprises a digital interpolating and filtering module realized by an FPGA (field programmable gate array), wherein, the digital interpolating and filtering module determines the current operation mode according to an interpolating / filtering gating signal, receives and stores input data, transfers the delayed data and filtering coefficients into a multiply and accumulate (MAC) calculating unit for calculation, and then transfers calculated results into a subsequent calculating unit; the subsequent calculating unit decides whether accumulation is required according to the current operation mode; when the operation mode is digital interpolating operation, the calculated results are directly taken as interpolation results to be output; and when the operation mode is digital filtering operation, digital filtering operation results are output after accumulation. The digital oscilloscope combines two signal processing modes such as digital interpolating and digital filtering into one by means of multiplexing mode configuration, thus effectively saving internal resources of the FPGA and being very economical and efficient.

Description

technical field [0001] The invention relates to a digital oscilloscope, in particular to a digital oscilloscope capable of configuring multiplexing digital interpolation and digital filtering functions, and belongs to the technical field of electromagnetic measuring instruments. Background technique [0002] Digital oscilloscope is a new type of oscilloscope composed of data acquisition unit, A / D converter, scanning oscillator, etc. It plays a very important role in scientific research and production. In addition to conventional waveform sampling functions, digital oscilloscopes should also have waveform analysis and display functions. Therefore, it is very useful to realize waveform reconstruction through digital interpolation technology under the hour base position of the digital oscilloscope. [0003] Digital interpolation is a technique to generate interpolation points between actual waveform sampling points, and it is an important function of digital oscilloscopes. Cu...

AI Technical Summary

Problems solved by technology

At present, most digital oscilloscopes cannot provide digital interpolation and digital filtering functions at the same time

Although individual digital oscilloscopes can provide digital interpolation and digital filtering functions at the same time, they are all calculated separately through DSP, and the calculation overhead is very considerable.

Especially when the DSP is also responsible for other control and calculation tasks of the digital oscilloscope, the DSP resources occupied by the digital filtering operation will cause the running speed of the entire oscilloscope to drop.

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