Demonstrating Windowing Using NI SignalExpress Software
PrintOnline demonstration on Windowing using NI SignalExpress
You can create the demo yourself using the NI SignalExpress software by following the steps below. Follow the additional exercises at the bottom of this document to explore more on Windowing.
1. If you do not already have NI SignalExpress® installed on your PC, download and install the evaluation version from here.
2. Launch a new SignalExpress project by navigating to Start>>All programs>>National Instruments>>SignalExpress>>SignalExpress.
3. Follow the steps below to create an example shown in the online demonstration.
a. Add a Create Signal step and select the properties as shown in the figure below. Drop the sine wave on a display.
b. Add a power spectrum step and set the properties as shown in the figure below. Drop the result of this step on another display.
c. Apply Windowing to the original sine wave and take the power spectrum of this modified sine wave. Drop this power spectrum on the second display.
d. Notice the difference between the two power spectrums.
4. Follow the steps below to further explore Windowing:
a. Apply different types of Windowing functions (Hanning, Blackman Harris, Flat Top) to the original signal and see how the affects power spectrum in each case.
b. Change the type and properties of the original signal and explore how it affects the power spectrum after applying the above mentioned Windowing functions.
Related Links:
Windowing: Optimizing FFTs Using Window Functions
Reader Comments | Submit a comment »
Legal
This tutorial (this "tutorial") was developed by National Instruments ("NI"). Although technical support of this tutorial may be made available by National Instruments, the content in this tutorial may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this content with each new revision of related products and drivers. THIS TUTORIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).