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音の波形で遊ぼう! - Creators MeetUp 18
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2014/07/19 第18回 Creators MeetUp 発表用資料
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音の波形で遊ぼう! - Creators MeetUp 18
1.
音の波形で遊ぼう! 柊 -
Creators MeetUp 18
2.
自己紹介 • HN :
柊(Hiiragi) • Twitter : @Hiiragi3 • Job : FlashDeveloper ! • Fav : お酒とFalcomゲーム • Deemo
3.
登壇者たちの悪ノリ 開場10分前 「好きなエディタをスライドに入れよう!」
4.
登壇者たちの悪ノリ 好きな 使っているエディタ (Win)秀丸, (Mac)Fraise Flash
は FlashBuilder で作っているので・・・。
5.
アジェンダ • 音とは何か • 波形を知ろう
6.
1.音とは何か?
7.
物体の振動です
8.
例えば「音 」(343円(税抜))
9.
例えば「スピーカー」
10.
振動のグラフ表現方法
11.
「振動」とは「揺れ」
12.
揺れを表現するには ! 時間軸と、その瞬間ごとの値の推移
13.
時間軸と、その瞬間ごとの値の推移
14.
音(振動)は波として表現できる
15.
音を構成している要素
16.
音の三大要素 • 大きさ • 高さ •
音色
17.
波形で表すと • 大きさ =
振幅 • 高さ = 周波数 • 音色 = 波形
18.
波形で表すと • 大きさ =
振幅 • 高さ = 周波数 • 音色 = 波形
19.
波形で表すと • 大きさ =
振幅 • 高さ = 周波数 • 音色 = 波形
20.
波形で表すと • 大きさ =
振幅 • 高さ = 周波数 • 音色 = 波形
21.
音の大きさ = 波の振幅 •
実際に変化を実感してみましょう
22.
音の高さ = 周波数 •
波の密度が高ければ音が高くなる • 密度が低ければ音は低くなる
23.
2.波形を知ろう
24.
音色 = 波形 •
一例 • 正弦波 • のこぎり波
25.
正弦波 - SineWave •
丸い音 • 純音
26.
ノコギリ波 - SawtoothWave •
鋸歯状波(きょしじょうは)とも言う • ブザーみたいな音
27.
ここでやっとチップチューンでの紹介
28.
チップチューン 「チープな電子音を組み合わせて作られた音楽」 ! まぁ、昔のゲームの曲っぽい感じ
29.
ファミコンで説明しましょう
30.
ファミコンが扱う事が出来る波形 • 三角波 *
1 • 矩形波 * 2 • ノイズ * 1 • DPCM * 1 • 拡張音源
31.
三角波 - TriangleWave •
正弦波よりちょっと尖った音が入っている • ファミコンの三角波は独特のため、疑似三角波とも呼 ばれる。
32.
矩形波 - PulseWave(SquareWave) •
4種類の音(比率が違うだけ)が用意されている • 1:1 • 1:3 • 1:7 • 3:1
33.
ノイズ - Noise •
特定の法則に則って様々な周波数をランダムに再生す る • 長周期ノイズと短周期ノイズがある • ドラムとか、衝突音とか、爆発とか、階段音とか、 ビームとか。
34.
DPCM - Differential
Pulse-Code Modulation • 差分パルス符号変調 • 今までは波形を生成してきたが、これは元からある波形デー タを再生する • 今までの音では再現できないものを再生できる • 音声 • 豪華な音 • 容量を食ってしまうのがデメリット
35.
拡張音源 • RP2C33(FDS) • NAMCOT
16x(N160/N163) • MMC5 • SUNSOFT 5B (FME-7互換チップ) • VRC6 • VRC7
36.
最後に • ちょっと波形をカスタマイズしてみましょう
37.
以上です
38.
ご清聴ありがとうございました
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