...The technology to compress this amount of data is called voice coding. There are two methods: one is to efficiently compress the voice waveform itself (in the time domain) (the most typical method is the ADPCM method), and the other is to convert the voice waveform into spectrum information and compress it in the frequency domain (the most typical method is the LPC method). The former is used to compress to about 16 kilobits, and the latter to about 4 to 8 kilobits. ... *Some of the terminology that refers to the "LPC method" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このデータ量を圧縮する技術を音声符号化という。音声波形そのものを(時間領域で)効率よく圧縮する方法(代表的なのはADPCM方式)と音声波形をいったんスペクトル情報に変換して周波数領域で圧縮する方法(代表的なのはLPC方式)がある。前者は16キロビット,後者では4~8キロビットくらいの圧縮に用いられる。… ※「LPC 方式」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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