* [[wp>MIDI]]
  * [[wp>Analog-to-digital converter]]
  * [[wp>Envelope (waves)]]
    * 振幅包絡

  * [[wp>Pulse-code modulation|Pulse-code modulation (PCM)]]
    * 將音訊振幅分為數階。
    * <q>In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps.</q>
  * [[wp>Differential pulse-code modulation|Differential pulse-code modulation (DPCM)]]
    * 儲存音階差，以減少使用 bit 數。
  * [[wp>Adaptive differential pulse-code modulation|Adaptive differential pulse-code modulation (ADPCM)]]
    * 透過建表，進一步減少使用 bit 數。但因表格大小限制，誤差會比較大。

  * [[wp>Sampling|取樣率]]
    * 10Khz 代表每秒對音頻取 10K 個樣本。一般會取音頻頻寬兩倍的樣本，方能從樣本重建回原本音頻。

====== 外部連結 ======
  * [[http://www.midi.twmail.net/ltu01.htm|認識數位音訊]]
  * [[http://202.197.191.206:8080/13/text/catlog.htm|多媒體技術基礎]]
  * [[wp>Cakewalk (sequencer)|Cakewalk]]