12.10 This exercise focuses on building a digital filter using LabVIEW built-in filtering| functions. Specifically, we...
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12.10 This exercise focuses on building a digital filter using LabVIEW built-in filtering| functions. Specifically, we will build the VI depicted in Figure 12.25, which is 11pt Application Font Ex-10 Function-Gen-with-Filter.vi Front Panel * Frequency (Hz) Noise Amplitude Original Signal Graph 5- 3 0.2 4- Amplitude (V) Cut-off Frequency 2- 2 10 0- Phase 0.00 STOP Offset 0.00 -5- 0.2 0.4 0.6 0.8 Time Noisy Graph Noisy Filtered Filtered N 2.5 2- 2.5- 2- 1.5- 1.5- Amplitude 1- 0.5- 0- -0.5- -1- -1.5- Amplitude 1- 0.5- 0- -0.5- -1- -1.5- -2- -2.5- -2- -2.5- 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 Time Time Figure 12.25 Function generator and filter Front Panel. used to generate a sinusoidal function and after adding noise, filtering the signal, and displaying the filtered signal alongside the original signal. Note that in spite of the scaling factors, the filtered and original signals are of the same range in magni- tude. The figure shows the noise amplitude to be about 10% of the signal ampli- tude but this can be changed as necessary. The filter cut-off signal can also be changed at will. Since the design is rather complicated, the Block Diagram is shown in Figure 12.26. Note that each of the elements used in the Block Diagram can be obtained from the subpalettes of the Function palette although some require a bit of digging in the various subpalettes, which also helps familiarize you with the various functionalities of LabVIEW. Ex-10 Function-Gen-with-Filter.vi Block Diagram 40T 040 11pt Application Font Offset DBL Frequency (Hz) DBL Sine Waveform.vi Amplitude (V) DBE Phase DBL Original Signal Graph w Noisy Graph Noise Amplitude DBL ?!?! Uniform White Noise Waveform.vi In Place Element Structure Convert from Dynamic Data Filter Signal Filtered Signal [] error out 4 error in (no errc Lower Cut-Off ID Cut-off Frequency DBL i Array of Wave Form F]Filtered Graph TEO Figure 12.26 Function generator and filter Block Diagram. 11. 12.10 This exercise focuses on building a digital filter using LabVIEW built-in filtering| functions. Specifically, we will build the VI depicted in Figure 12.25, which is 11pt Application Font Ex-10 Function-Gen-with-Filter.vi Front Panel * Frequency (Hz) Noise Amplitude Original Signal Graph 5- 3 0.2 4- Amplitude (V) Cut-off Frequency 2- 2 10 0- Phase 0.00 STOP Offset 0.00 -5- 0.2 0.4 0.6 0.8 Time Noisy Graph Noisy Filtered Filtered N 2.5 2- 2.5- 2- 1.5- 1.5- Amplitude 1- 0.5- 0- -0.5- -1- -1.5- Amplitude 1- 0.5- 0- -0.5- -1- -1.5- -2- -2.5- -2- -2.5- 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 Time Time Figure 12.25 Function generator and filter Front Panel. used to generate a sinusoidal function and after adding noise, filtering the signal, and displaying the filtered signal alongside the original signal. Note that in spite of the scaling factors, the filtered and original signals are of the same range in magni- tude. The figure shows the noise amplitude to be about 10% of the signal ampli- tude but this can be changed as necessary. The filter cut-off signal can also be changed at will. Since the design is rather complicated, the Block Diagram is shown in Figure 12.26. Note that each of the elements used in the Block Diagram can be obtained from the subpalettes of the Function palette although some require a bit of digging in the various subpalettes, which also helps familiarize you with the various functionalities of LabVIEW. Ex-10 Function-Gen-with-Filter.vi Block Diagram 40T 040 11pt Application Font Offset DBL Frequency (Hz) DBL Sine Waveform.vi Amplitude (V) DBE Phase DBL Original Signal Graph w Noisy Graph Noise Amplitude DBL ?!?! Uniform White Noise Waveform.vi In Place Element Structure Convert from Dynamic Data Filter Signal Filtered Signal [] error out 4 error in (no errc Lower Cut-Off ID Cut-off Frequency DBL i Array of Wave Form F]Filtered Graph TEO Figure 12.26 Function generator and filter Block Diagram. 11.
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