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- 振幅包絡
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- 將音訊振幅分為數階。
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.
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- 儲存音階差，以減少使用 bit 數。
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- 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。
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- 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。
