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Amplitude, Frequency and Phase Modulation
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You can use SigGen modules to generate a modulating signal, AM, FM, PM, and use the Plot module to display them. The following example generates four sine waves, uses one to modulate the other three and plots them. You can also use other modules to process the generated data. For example, you can save the data in binary or text format and also perform various measurements. Open the Modulation-All.dsp project in DspSee to see this example in action. Click to download DspSee dsp software. Below is a description of the Modulation-All.dsp project file. Feel free to change it to try different things. |
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//Modulation-All.dsp
//Copyright www.aubraux.com
//DspSee sample file. Shows generation of amplitude, frequency & phase modulations with SigGen module.
//Requires SigGen and Plot modules.
| //AM Signal Generator | |
| load sgam="SigGen" | //Loads the SigGen module. This module can generate waveforms of different shapes. |
| sgam.type="sine" | //Sets signal type as sine |
| sgam.freq=10.01M | //Sets frequency to 10.01 MHz |
| sgam.pk2pk=2 | //Sets peak-peak voltage to 2V |
| sgam.offset=0 | //Sets DC offset voltage to 0V |
| sgam.am.on=1 | //Enables amplitude modulation |
| sgam.am.gain=1 | //Sets the AM port gain |
| sgam.gui.more=1 | //Shows more advanced settings |
| sgam.gui.wnd="sg" | //Sets the gui window name |
| sgam.gui.title="SigGen Setup" | //Sets the gui window title |
| sgam.gui.move(500,0) | //Moves the window to (x=500, y=0) |
| //FM Signal Generator | |
| load sgfm="SigGen" | //Loads the SigGen module. This module can generate waveforms of different shapes. |
| sgfm.type="sine" | //Sets signal type as sine |
| sgfm.freq=10.01M | //Sets frequency to 10.01 MHz |
| sgfm.pk2pk=2 | //Sets peak-peak voltage to 2V |
| sgfm.offset=0 | //Sets DC offset voltage to 0V |
| sgfm.fm.on=1 | //Enables frequency modulation |
| sgfm.fm.gain=5M | //Sets the FM port gain |
| sgfm.gui.more=1 | //Shows more advanced settings |
| sgfm.gui.wnd="sg" | //Sets the gui window name |
| sgfm.gui.title="SigGen Setup" | //Sets the gui window title |
| sgfm.gui.move(500,0) | //Moves the window to (x=500, y=0) |
| //PM Signal Generator | |
| load sgpm="SigGen" | //Loads the SigGen module. This module can generate waveforms of different shapes. |
| sgpm.type="sine" | //Sets signal type as sine |
| sgpm.freq=10.01M | //Sets frequency to 10.01 MHz |
| sgpm.pk2pk=2 | //Sets peak-peak voltage to 2V |
| sgpm.offset=0 | //Sets DC offset voltage to 0V |
| sgpm.pm.on=1 | //Enables phase modulation |
| sgpm.pm.gain=10 | //Sets the PM port gain |
| sgpm.gui.more=1 | //Shows more advanced settings |
| sgpm.gui.wnd="sg" | //Sets the gui window name |
| sgpm.gui.title="SigGen Setup" | //Sets the gui window title |
| sgpm.gui.move(500,0) | //Moves the window to (x=500, y=0) |
| //Modulating Signal Generator | |
| load wm="SigGen" | //Loads the SigGen module. This module can generate waveforms of different shapes. |
| wm.type="sine" | //Sets signal type as sine |
| wm.freq=999K | //Sets frequency to 999 KHz |
| wm.samplerate=100M | //Sets sample rate to 100 MSPS |
| wm.pk2pk=2 | //Sets peak-peak voltage to 2V |
| wm.offset=0 | //Sets DC offset voltage to 0V |
| wm.reclen=1000 | //Sets record length to 1000 |
| link sgam.am=wm.out | //Links sgam synth's AM input port to mod synth's output port |
| link sgfm.fm=wm.out | //Links sgfm synth's FM input port to mod synth's output port |
| link sgpm.pm=wm.out | //Links sgpm synth's PM input port to mod synth's output port |
| wm.gui.wnd="sg" | //Sets the gui window name |
| wm.gui.title="SigGen Setup" | //Sets the gui window title |
| wm.gui.move(500,0) | //Moves the window to (x=500, y=0) |
| //Plot | |
| load p1="Plot" | //Loads the Plot module. This module can display input data in various formats. |
| p1.plot.title="Plot Window" | //Sets the title of the plot window to "Plot Window" |
| p1.setup.title="Plot Setup" | //Sets the title of the plot setup window to "Plot Setup" |
| link p1.src.ch1=wm.out | //Links the mod signal output to Plot input |
| link p1.src.ch2=sgam.out | //Links the sgam output to Plot input |
| link p1.src.ch3=sgfm.out | //Links the sgfm output to Plot input |
| link p1.src.ch4=sgpm.out | //Links the sgpm output to Plot input |
| p1.ch1.label="Mod Input" | //Sets the Plot ch1 label |
| p1.ch2.label="AM Output" | //Sets the Plot ch2 label |
| p1.ch3.label="FM Output" | //Sets the Plot ch2 label |
| p1.ch4.label="PM Output" | //Sets the Plot ch2 label |
| p1.ch1.vposition=2 | //Sets ch1 vertical position to 0 |
| p1.ch2.vposition=0 | //Sets ch2 vertical position to 0 |
| p1.ch3.vposition=-2 | //Sets ch3 vertical position to 0 |
| p1.ch4.vposition=-4 | //Sets ch4 vertical position to 0 |
| p1.ch1.vscale.auto=0 | //Sets ch1 vertical scale auto to OFF |
| p1.ch2.vscale.auto=0 | //Sets ch2 vertical scale auto to OFF |
| p1.ch3.vscale.auto=0 | //Sets ch3 vertical scale auto to OFF |
| p1.ch4.vscale.auto=0 | //Sets ch4 vertical scale auto to OFF |
| p1.ch1.vscale=1 | //Sets ch1 vertical scale to 1V/div |
| p1.ch2.vscale=2 | //Sets ch2 vertical scale to 2V/div |
| p1.ch3.vscale=1 | //Sets ch3 vertical scale to 1V/div |
| p1.ch4.vscale=1 | //Sets ch4 vertical scale to 1V/div |
| p1.setup.move(280,0) | //Moves the plot setup gui to (x=280, y=0) |
| p1.plot.move(0,220) | //Moves the plot window to (x=0, y=220) |
| p1.plot.size(1000,420) | //Resizes the plot window to (width=1000, height=420) |
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