…Even if there are slight differences in the level settings during compression and expansion, there is an advantage that there is no degradation, just a change in the output level, but for devices with high noise levels, the noise breathing phenomenon can be a problem. The Dolby system is one of the most representative NR systems. Emphasis is the process of boosting the frequency characteristics of the band where the system noise is high on the input side, and de-emphasis is the process of attenuating the opposite characteristics on the output side, and is used for noise reduction. … *Some of the terminology used to refer to the "Dolby system" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…圧縮時,伸長時のレベル設定に多少の相違があっても,出力レベルの変化があるだけで劣化が生じない利点があるが,雑音レベルの高い機器に対しては,雑音の息づき現象が問題になることもある。 ドルビー方式Dolby system代表的なNRシステムの一つである。入力側で系の雑音が大きい帯域の周波数特性をもち上げておくことをエンファシスemphasis,出力側で逆特性の減衰を行うことをディエンファシスde‐emphasisといい,雑音低減に用いられる。… ※「Dolby system」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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