MAKE A MEME
View Large Image
| View Original: | In-phase and quadrature components of angle modulation.gif (912x431) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: In-phase and quadrature components of angle modulation.gif en Example of how an angle-modulated sinusoid can be decomposed into or synthesized from two amplitude-modulated sinusoids 2013-10-27 11 26 45 own Bob K Octave script <source lang Matlab > graphics_toolkit gnuplot N 500; length of plot sams 0 N; cycles 0 25; 1/4 cycle of phi t cyc_per_sam cycles/N; phi pi/2 sin 2 pi cyc_per_sam sams ; cycles 4; 4 cycles of carrier wave cyc_per_sam cycles/N; z cos 2 pi cyc_per_sam sams + phi ; carrier x cos 2 pi cyc_per_sam sams cos phi ; in-phase y cos 2 pi cyc_per_sam sams + pi/2 sin phi ; quadrature figure plot sams sin phi 'color' 'red' 'linewidth' 3 envelope ylim -1 2 1 2 ; box off hold on plot sams cos phi 'color' 'blue' 'linewidth' 3 envelope plot sams x 'color' 'blue' plot sams y 'color' 'red' plot sams z 'color' 'green' 'linewidth' 2 set gca 'xaxislocation' 'zero' set gca 'yaxislocation' 'zero' set gca 'xgrid' 'on' ; set gca 'ygrid' 'off' ; set gca 'ytick' 0 ; cycles_per_tick 0 25; sam_per_tick cycles_per_tick/cyc_per_sam; set gca 'xtick' 0 16 sam_per_tick ; set gca 'XTickLabel' ' 0'; ' '; '2'; ' '; '4'; ' '; '6'; ' '; '8'; ' '; ' '; '11'; ' '; '13'; ' '; '15'; ' ' green 0 170 0/256; text 400 9 '\uparrow sin \phi t ' 'color' 'red' text 30 86 '\uparrow cos \phi t ' 'color' 'blue' text 147 44 '\leftarrow I t ' 'color' 'blue' text 165 30 'Q t \rightarrow' 'color' 'red' text 121 1 '\leftarrow cos 2\pift + \phi t \rightarrow' 'color' green text 146 87 ' I t +Q t ' 'color' green title 'In-phase and quadrature components example ' 'fontsize' 12 ; xlabel '\leftarrow time t \rightarrow' 'fontsize' 12 ylabel 'amplitude' 'fontsize' 10 </source> cc-zero Uploaded with UploadWizard Signal processing | ||||
