Synth Keyboard ❤️

synth keyboard

八度(英語:Octave,亦稱為完全八度)是音程的一種,它的組成是由2個相同音名但來自不同音域所組成。兩音的距離為 12半音,而頻率的比例是 2:1,換而言之,較高音的頻率為較低音的兩倍

Pitch Formula

計算音頻的公式:

pitch =a2n12\boxed{\text{pitch }=a\cdot 2^{\frac{n}{12}}}

  • aa: 440 Hz ( pitch of A4A_4)

  • nn: number of notes above or below A4A_4

Notes

Live Demo

Code

💾 replit

<!-- 
 store the note value in a custom `note` attribute 
 so it’s easy to access in JavaScript

 our keyboard covers just over an octave, 
 starting at C₃ and ending at F₄.
-->
<ul id="keyboard">
  <li note="C"  octave="3" class="white no-offset">A</li>
  <li note="C#" octave="3" class="black">W</li>
  <li note="D"  octave="3" class="white">S</li>
  <li note="D#" octave="3" class="black">E</li>
  <li note="E"  octave="3" class="white">D</li>
  <li note="F"  octave="3" class="white no-offset">F</li>
  <li note="F#" octave="3" class="black">T</li>
  <li note="G"  octave="3" class="white">G</li>
  <li note="G#" octave="3" class="black">Y</li>
  <li note="A"  octave="4" class="white">H</li>
  <li note="A#" octave="4" class="black">U</li>
  <li note="B"  octave="4" class="white">J</li>
  <li note="C2" octave="4" class="white no-offset">K</li>
  <li note="C#2" octave="4" class="black">O</li>
  <li note="D2" octave="4" class="white">L</li>
  <li note="D#2" octave="4" class="black">P</li>
  <li note="E2" octave="4" class="white">;</li>
  <li note="F2" octave="4" class="white no-offset">'</li>
</ul>

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