Signal processing method for USB bus based built-in virtual instrument

Abstract

This invention relates to imbed computer technique and the signal process method based on USB bus virtual device, which comprises signal collecting module, signal modulation module and display screen and the method comprises multi-channel signal collection method, modulation method and data wave display method, wherein, the method is to collect signal for digital filter wave into specific curve composed of data buffer and speed matching method, signal arbitrary and control method.

Description

technical field [0001] The invention belongs to the field of computer application technology, in particular to a signal processing method of an embedded virtual instrument based on a USB bus using embedded computer technology and computer signal acquisition technology. Background technique [0002] Virtual Instrument (Virtual Instrument, referred to as VI) is a computer instrument system that is designed and defined by the user on a hardware platform with a general-purpose computer as the core, has a virtual panel, and has test functions realized by test software. The user can operate the hardware platform of the computer system by clicking on the virtual panel with the mouse, just like using a special electrical measuring instrument. Virtual instrument is a computer instrument system, which uses the display function of PC monitor (CRT) to simulate the control panel of traditional instruments, expresses and outputs test results in various forms, and uses the powerful softwar...

AI Technical Summary

Problems solved by technology

[0011] (1) The degree of automation of the test system is not high, still relying on manual adjustment and testing, and some parameters cannot be automatically tested;

[0012] (2) The signal measurement accuracy is low, the following speed is slow, the real-time performance is poor, and the anti-interference ability of the test system is poor. It needs to be analyzed and improved by using advanced test theory and test methods;

[0013] (3) The environment of the test site is poor, and the signals to be tested are basically weak electric signals with many noise signals. At present, the data processing method of the general test system is simple, so the reliability and authenticity of the measured data are not high. Advanced data processing methods for data processing;

[0014] (4) Traditional virtual instrument systems are often based on PC bus, VXI bus, PXI bus, and serial ports. Data transmission is slow and it is difficult to meet the requirements of modern testing tasks; at the same time, virtual instrument systems designed using these bus methods are often It is troublesome to install and inconvenient to carry. For industrial test tasks or experiments that need to change positions constantly, the virtual instrument of this structure is very inconvenient to use;

[0015] (5) Traditional virtual instruments can only collect and process single-channel data in real time. For high-speed industrial real-time test tasks or experiments that require multi-channel test data, traditional virtual instrument signal processing methods cannot meet the requirements

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