Digital Signal Processing System Design, Second Edition: by Nasser Kehtarnavaz

By Nasser Kehtarnavaz

This booklet combines textual and graphical programming to shape a hybrid programming technique, allowing a better technique of construction and studying DSP platforms. The hybrid programming technique permits using formerly constructed textual programming strategies to be built-in into LabVIEWs hugely interactive and visible atmosphere, supplying a better and swifter approach for development DSP structures. This e-book is a perfect advent for engineers and scholars trying to improve DSP platforms in speedy time.

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Extra resources for Digital Signal Processing System Design, Second Edition: LabVIEW-Based Hybrid Programming

Example text

The control is labeled as Frequency. The Express VI can be resized to show more terminals at the 41 Lab 2 Figure L2-5: Plot with Loose Fit. bottom of the expandable node. Resize the VI to show an additional terminal below the Sine terminal. Then, click on this new terminal, error out by default, to select Frequency from the list of the displayed terminals. Next, replace the Scaling and Mapping Express VI with a Multiply function (Functions » Programming » Numeric » Multiply). Place another Vertical Pointer Slide control and wire it to the y terminal of the Multiply function to adjust the gain.

This brings up a configuration window, as shown in Figure L2-2. Different types of signals including sine, square, triangle, sawtooth, or DC can be generated with this VI. Enter and adjust the parameters as indicated in Figure L2-2 to simulate a sinewave having a frequency of 200 Hz and an amplitude swinging between –100 and 100. Set the sampling frequency to 8000 Hz. 875 milliseconds (ms) is generated. Note that when the parameters are changed, the modified signal gets displayed instantly in the Result Preview graph window.

Position the While Loop to enclose all the Express VIs and the graph. Now the VI is ready to be run. 39 Lab 2 Figure L2-3: Configuration of Scaling and Mapping Express VI. Run the VI and observe the waveform graph. The output should appear as shown in Figure L2-4. To extend the plot to the right-end of the plotting area, right-click on the waveform graph, choose X Scale, and then uncheck Loose Fit from the shortcut menu. The graph shown in Figure L2-5 should appear. If the plot runs too fast, a delay can be placed in the While Loop.

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