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set term png
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set output "kadai2-1dft.png"
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fs = 16000.0
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N_fft = 512.0
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set xlabel "Frequency [kHz]"
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set ylabel "Amplitude"
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set xrange [0:8]
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set grid
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plot "sample01_dft.txt" using ($0 * fs / N_fft / 1000):1 \
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with lines notitle
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