… Digital audio discs are new discs that incorporate digital technology, and are expected to replace traditional records because of their good sound quality. At the development stage in the 1970s, there were three DAD formats: the compact disc format (CD format), the audio high density disc format (AHD format), and the mini disc format (MD format). Signals over a wide range of frequencies, from about 20 Hz to 20,000 Hz, are converted to PCM (pulse code modulation) and recorded on the disc. … *Some of the terminology explanations that mention "AHD" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ディジタルオーディオディスクは,ディジタル技術を導入した新しいディスク(円盤)で,再生される音の品質もよく従来のレコードに代わるものと期待されている。1970年代の開発の段階では,DADには,コンパクトディスク方式(CD方式),オーディオハイデンシティディスク方式(AHD方式),ミニディスク方式(MD方式)の3方式があった。約20Hzから2万Hzに及ぶ広い帯域の信号がPCM(パルス符号変調)化されてディスクに記録される。… ※「AHD」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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