4.3 Generating the Filter Output

To generate the filter output, complete the following steps:

  1. To configure the input frequencies and coefficients, click the icon to connect as shown in the following figure.
    Figure 4-5. Connect
  2. After clicking the icon , the GUI prompts you to press the SW1 on the board and to click OK as shown in the following figure.
    Figure 4-6. Establish Communication
  3. After clicking OK, click the icon to start as shown in the following figure.
    Figure 4-7. Start
  4. After clicking the icon, the filter operation completes. The GUI displays the Operation Completed message and plots the filtered data and the FFT data on the Filter Output tab as shown in the following figure. As the low-pass filter option was selected, the high-frequency component is suppressed while the low-frequency signal is preserved. This is observable in the frequency spectrum of the output signal.
    Figure 4-8. Filter Output Tab
    Important: The accuracy of frequencies represented in the frequency plot depends on the frequency resolution used (sampling rate and FFT length).
  5. Zoom-in or zoom-out the waveform using the options shown in the following figure.
    Figure 4-9. Zooming the Filter Output
  6. The Text Viewer displays the filter coefficients, input signal, output signal, and FFT output data values, as shown in the following figure.
    Figure 4-10. Text Viewer
  7. Close the GUI.

This concludes DSP FIR Filter demo.