loudly

　 　

WordNet

1. with relatively high volume; "the band played loudly"; "she spoke loudly and angrily"; "he spoke loud enough for those at the back of the room to hear him"; "cried aloud for help" (同)loud, aloud
2. characterized by or producing sound of great volume or intensity; "a group of loud children"; "loud thunder"; "her voice was too loud"; "loud trombones"

PrepTutorEJDIC

1. 『大声で』,『騒々しく』,声高に / はでに,けばけばしく
2. (音・声が)『大きい』,大きな音を出す / 『騒々しい』;はでな,人目を引く / 『大声で』,声高に

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/12/20 01:38:57」(JST)

wiki en

[Wiki en表示]

For the Japanese band, see Loudness (band).

See also: Louder (disambiguation)

Loudness is the characteristic of a sound that is primarily a psychological correlate of physical strength (amplitude). More formally, it is defined as "that attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud".

Loudness, a subjective measure, is often confused with objective measures of sound strength such as sound pressure, sound pressure level (in decibels), sound intensity or sound power. Filters such as A-weighting attempt to adjust sound measurements to correspond to loudness as perceived by the typical human. However, loudness perception is a much more complex process than A-weighting.

Loudness is also affected by parameters other than sound pressure, including frequency, bandwidth and duration.

Explanation

The perception of loudness is related to both the sound pressure level and duration of a sound. The human auditory system averages the effects of sound pressure level (SPL) over a 600–1000 ms interval. A sound of constant SPL will be perceived to increase in loudness as samples of duration 20, 50, 100, 200 ms are heard, up to a duration of about 1 second at which point the perception of loudness will stabilize. For sounds of duration greater than 1 second, the moment-by-moment perception of loudness will be related to the average loudness during the preceding 600–1000 ms.

For sounds having a duration longer than 1 second, the relationship between SPL and loudness can be approximated by a power function in which SPL has an exponent of 0.6, while that between SPL and intensity can be approximated by a power function with an exponent of 0.3(Stevens' power law). More precise measurements indicate that loudness increases with a higher exponent at low and high levels and with a lower exponent at moderate levels.

Units used to measure loudness:

• Sone (loudness N)
• Phon (loudness level L)

The horizontal axis shows frequency in Hz

The sensitivity of the human ear changes as a function of frequency, as shown in the equal-loudness graph. Each line on this graph shows the SPL required for frequencies to be perceived as equally loud. It also shows that humans with good hearing are most sensitive to sounds around 2–4 kHz, with sensitivity declining to either side of this region. A complete model of the perception of loudness will include the integration of SPL by frequency and the duration of each.

Hearing loss

When sensorineural hearing loss (damage to the cochlea or in the brain) is present, the perception of loudness is altered. Sounds at low levels (often perceived by those without hearing loss as relatively quiet) are no longer audible to the hearing impaired, but interestingly, sounds at high levels often are perceived as having the same loudness as they would for an unimpaired listener. This phenomenon can be explained by two theories: Loudness grows more rapidly for these listeners than normal listeners with changes in level. This theory is called "loudness recruitment" and has been accepted as the classical explanation. More recently, it has been proposed that some listeners with sensorineural hearing loss may in fact exhibit a normal rate of loudness growth, but instead have an elevated loudness at their threshold. That is, the softest sound that is audible to these listeners is louder than the softest sound audible to normal listeners. This theory is called "softness imperception", a term coined by Mary Florentine.

Compensation

Main article: Loudness compensation

The "loudness" control on some consumer stereos alters the frequency response curve to correspond roughly with the equal loudness characteristic of the ear. Loudness compensation is intended to make the recorded music sound more natural when played at a lower sound pressure level.

Normalization

Loudness normalization equalizes perceived level such that, for instance, commercials do not sound louder than television programs. Loudness normalisation schemes exist for a number of audio applications.

Broadcast

• Commercial Advertisement Loudness Mitigation Act
• European Broadcasting Union R128

Movie and home theaters

• Dialnorm

Music playback

• Sound Check in iTunes
• ReplayGain

Measurement

Relative loudness monitoring in production is measured in accordance with ITU-R BS.1770 in units of LKFS.

See also

• Loudness war
• Sending loudness rating
• Volume in acoustics is related to:
  • Amplitude
  • Sound pressure
  • Dynamics

References

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Related Links

• loudlyの意味 - 英和辞書 - goo辞書

loudlyとは。意味や和訳。[副]声高に, 騒々しく；はでに, けばけばしく. - goo辞書は国語、 英和、和英、中国語、百科事典等からまとめて探せる辞書検索サービスです。

• loudly - ウィクショナリー日本語版 - Wiktionary

loudly. 出典: フリー多機能辞典『ウィクショナリー日本語版（Wiktionary）』. 移動: 案内、 検索 ... He spoke loudly so that his brother could hear him from across the street. 彼は大声で話したので、通りの向こう側にいた彼の兄弟にも聞くことができた。

• Loud - Definition and More from the Free Merriam-Webster Dictionary

a : marked by intensity or volume of sound. b : producing a loud sound. 2. : clamorous, noisy. 3. : obtrusive or offensive in appearance or smell : obnoxious. — loud adverb. — loud·ly adverb. See loud defined for English-language learners » ...

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「loud」

「loud」

　　[★]

• 音が大きい、騒々しい

関

noisy