loudness

Japanese: loudness
loudness

...If monophonic intelligibility is around 80%, sentence intelligibility in normal conversations that contain redundancy will be nearly 100%.
[Loudness]
This is an evaluation method that focuses on the volume of the received voice. This is a type of sensory level that is determined as a measure of the sensory strength of the received sound, taking into account the characteristics of the human ear. In general communication systems with a good level of transmission characteristics, the louder the received voice volume, the better the communication quality can be determined.

*Some explanations of terms that mention "loudness" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…単音明りょう度が80%程度あれば,冗長性があるふつうの会話での文章了解度はほぼ100%満たされる。
[ラウドネスloudness]
 受話音量の大きさに着目した評価法である。これは人間の耳の特性をも考慮した受聴音の感覚的な強さの尺度として定められた感覚レベルの一種であり,伝送特性がある程度以上良好な一般の通信系では,受話音量が大きいほど通話品質としては優れていると判断できる。…

※「loudness」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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