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| View Original: | Mains hum spectrum.png (800x600) | |||
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| Keywords: Mains hum spectrum.png A spectrum analysis of Mains hum generated from an uncompressed file thanks to User Omegatron using Audacity Important to note if comparing this to the other spectrum analyses on Colors of noise is that due to the signal having only a single major frequency component so nearly all of the energy is concentrated in a small frequency band the intensity scale range was increased by about 50 to show the full peak Also the frequency scale was adjusted to include 60Hz and its surrounding frequencies Instructions n set terminal png transparent font /usr/share/fonts/truetype/ttf-bitstream-vera/Vera ttf size 800 600 enhanced set output mains_hum_spectrum png this seems to fix the trailers on the TTF font for the x-label set bmargin 4 enable grid set grid set grid mxtics set up x-axis set logscale x 10 set xrange 20 22000 set xlabel Frequency Hz set xtics border nomirror set up y-axis set yrange -40 30 set ylabel Intensity dB set ytics border nomirror again to deal with bad bboxes on the TTF set key height 1 box plot the output from Audacity plot mains_hum txt title Mains Hum with filledcurves x1 3 Ktims Mains electricity | ||||
