set terminal pngcairo size 800,600 font "Arial,12"

# 課題1
set output 'kadai1.png'
set xlabel "Time [msec]"
set ylabel "Normalized Amplitude"
set xrange [0:30]
set yrange [-1:1]
set grid
plot 'kadai1.txt' using 1:2 with lines title "sample01.sw"

# 課題2 (リニア)
set output 'kadai2_linear.png'
set xlabel "Frequency [Hz]"
set ylabel "Amplitude"
set xrange [0:8000]
set autoscale y
set grid
plot 'kadai2_dft.txt' using 1:2 with lines title "DFT", \
     'kadai2_fft.txt' using 1:2 with lines title "FFT"

# 課題2 (dB)
set output 'kadai2_db.png'
set xlabel "Frequency [Hz]"
set ylabel "Amplitude [dB]"
set xrange [0:8000]
set yrange [-90:0]
set grid
plot 'kadai2_dft.txt' using 1:3 with lines title "DFT", \
     'kadai2_fft.txt' using 1:3 with lines title "FFT"

# 課題3 (リニア)
set output 'kadai3_linear.png'
set xlabel "Frequency [Hz]"
set ylabel "Amplitude"
set xrange [0:8000]
set autoscale y
set grid
plot 'kadai2_fft.txt' using 1:2 with lines title "No Window", \
     'kadai3_window.txt' using 1:2 with lines title "Hanning Window"

# 課題3 (dB)
set output 'kadai3_db.png'
set xlabel "Frequency [Hz]"
set ylabel "Amplitude [dB]"
set xrange [0:8000]
set yrange [-90:0]
set grid
plot 'kadai2_fft.txt' using 1:3 with lines title "No Window", \
     'kadai3_window.txt' using 1:3 with lines title "Hanning Window"

# 課題4 (dB - 各母音個別)
set xlabel "Frequency [Hz]"
set ylabel "Amplitude [dB]"
set xrange [0:8000]
set yrange [-90:0]
set grid

set output 'kadai4_a_db.png'
plot 'kadai4_a.txt' using 1:3 with lines title "/a/"

set output 'kadai4_i_db.png'
plot 'kadai4_i.txt' using 1:3 with lines title "/i/"

set output 'kadai4_u_db.png'
plot 'kadai4_u.txt' using 1:3 with lines title "/u/"

set output 'kadai4_e_db.png'
plot 'kadai4_e.txt' using 1:3 with lines title "/e/"

set output 'kadai4_o_db.png'
plot 'kadai4_o.txt' using 1:3 with lines title "/o/"

# 発展課題1 (スペクトログラム)
set pm3d map
set xlabel "Time [sec]"
set ylabel "Frequency [Hz]"
set xrange [0:*]
set yrange [0:8000]
set zrange [-90:0]
set cbrange [-90:0]
set cblabel "Amplitude [dB]"

# モノクロ表示（大きいところが黒、小さいところが白）
set palette defined (-90 "white", 0 "black")
set output 'hatten1_mono.png'
splot 'spectrogram.txt' using 1:2:3 notitle

# カラー表示（Jet風カラーマップ）
set palette rgbformulae 22,13,-31
set output 'hatten1_color.png'
splot 'spectrogram.txt' using 1:2:3 notitle