Digital oscilloscope with variable-order digital filter

A digital oscilloscope and digital filter technology, applied in the direction of digital variable display, etc., can solve the problems of interfering noise, occupying a lot of resources, and inconvenient to carry a computer with you.

Active Publication Date: 2011-05-11
SUZHOU RIGOL PRECISION ELECTRIC TECH
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AI Technical Summary

Problems solved by technology

[0008] For an oscilloscope with a non-adjustable digital filter, it may not be possible to clearly display the signal in some environments with complex interference signals
For example, if the input signal is mixed with low-frequency interference noise, then a low-pass filter such as bandwidth limitation or FilterVU will obviously not work.
[0009] In addition, although the digital oscilloscopes of Agilent and Tek provide extended calculation software that can be used for digital filter calculation on the computer, these software occupy a large amount of resources and can only be run on the computer.
However, in the field test, it is not convenient to carry the computer with you
[0010]

Method used

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Embodiment Construction

[0032] The variable-order digital filter in the present invention uses FPGA to realize the function of digital filtering, which solves the problem of low operation speed when using DSP-based software to realize digital filtering. Since the instructions are executed serially in DSP, digital hardware can only be used alone to realize the operation mode of parallel operation in order to shorten the time of the whole filtering operation. For example, it takes 10 steps to perform a filtering operation. If the DSP-based software design method is used, it takes 10 clock cycles to complete a calculation; if the parallel design method of digital hardware is used, 10 computing modules are used for parallel computing, and only 1 clock cycle is required. That's it. If 5 parallel computing modules are used for parallel computing, 2 clock cycles are required. In this way, although the time is doubled, the hardware resources used will be reduced by half. All in all, how many parallel comput...

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Abstract

The invention discloses a digital oscilloscope with a variable-order digital filter. The digital oscilloscope comprises an input module and a control processing module with an external memory, and also comprises the variable-order digital filter, wherein the input module and the variable-order digital filter are connected with the control processing module respectively; the input module is used for generating a configuration indication; and the control processing module is used for generating a corresponding filter coefficient according to the configuration indication and outputting the filter coefficient to the variable-order digital filter. By using the variable-order digital filter in the digital oscilloscope, the digital oscilloscope can perform digital filter operation without a special computer so as to greatly facilitate site testing and other applications.

Description

technical field [0001] The invention relates to a digital oscilloscope with a variable-order digital filter, belonging to the technical field of electromagnetic measuring instruments. Background technique [0002] A filter is a signal processing device that performs waveform processing on the input signal to filter out unnecessary signals and retain the required signals. According to the nature of the processed signal, the filter can be divided into two types: analog filter and digital filter. Among them, due to the development of computer technology and large-scale integrated circuit technology, digital filters can be realized by computer software, and can also be realized by large-scale digital hardware circuits. Digital filters have the advantages of high precision, high reliability, controllability, and easy implementation. Therefore, digital filters are very important components in digital signal processing systems. In addition, the filter can be divided into four typ...

Claims

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Application Information

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IPC IPC(8): G01R13/02
Inventor 王悦王铁军李维森
Owner SUZHOU RIGOL PRECISION ELECTRIC TECH
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