Significant efforts have been made in the investigation of possibilities for nonaliased discrete-time Cohen's class of time-frequency distribution's calculation of a signal sampled according to the Nyquist rate. This paper will present a method of calculating the nonaliased L-Wigner distribution, which is using the shot-time Fourier transform (STFT) as a basic step. It is easy extended to nonaliased realizations of other high order time-frequency distribution.

Through standard I/O interface, VISA can be the communication channel between zero-slot controller module and instrument. It is the kernel to make virtual instrument system open and interchange. While studying on the VPP specification in deeply, this paper discuss the design method of VISA resource template and node template, resource manager, I/O function, event handling, resource lock and etc. The applying results show this method has good property in system reliability and transplantable.

This paper provides a method of VXIbus instrument driver designing environment. Based on the Microsoft Windows operation system, it makes use of Visual C++ and Microsoft Access as programming tools to generate implementation interface, program interface and I/O interface for instrument driver. The realization of it is important to design test software platform for VXIbus.

As the software platform of the CAT (Computer Aided Test) Workstation, Visual ATE (Automated Test Environment) and virtual instrument can not only improve the efficiency of testing software development, but also take advantage of the resource of PC. This paper provides a method in developing test software automatic generation environment under Microsoft Windows. Through building visual instrument driver database, the test software that based on structural flow chart designing idea can generate.