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Difference between revisions of "Sound Quality Lite"
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→FAQ about loundness
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==FAQ about loundness == | ==FAQ about loundness == | ||
When we compute the loudness in Sound Quality Lite we get the above list of results in NVGate. | |||
[[File:loudness.png|400px]] | |||
Let’s find below the explanation of this loudness | Let’s find below the explanation of this loudness | ||
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According to the standards ISO532-1 : the spectrum is computed on the whole signal. The standards is for stationary signal. | According to the standards ISO532-1 : the spectrum is computed on the whole signal. The standards is for stationary signal. | ||
• Psycho: | • Psycho: Specific Loudness ch1” and “Psycho:loudness ch 1 | ||
Not standardize loudness, but based on DIN 45631/A1-2010. (One value every 2 ms for profile, and compute on the whole signal for the spectrum) | Not standardize loudness, but based on DIN 45631/A1-2010. (One value every 2 ms for profile, and compute on the whole signal for the spectrum) | ||
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There is 2 main ways to compute the loudness | There is 2 main ways to compute the loudness | ||
* The “European” way : Zwicker method | |||
ISO 532-1 (release in 2017 ) this standards is a revision and based on ISO 532 B. | ISO 532-1 (release in 2017 ) this standards is a revision and based on ISO 532 B. | ||
It is based on DIN 45631/A1 standard for determining both stationary and time variable noise according to Zwicker. | It is based on DIN 45631/A1 standard for determining both stationary and time variable noise according to Zwicker. | ||
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- Better continuity and comparability than earlier calculations. | - Better continuity and comparability than earlier calculations. | ||
* The “Amercian” Way. | |||
ISO 532-2 this standards is based and replaced ISO 532 A (loudness according to Stevens) | ISO 532-2 this standards is based and replaced ISO 532 A (loudness according to Stevens) | ||
The standard is based on the American ANSI S3.4-2007 standard for calculating stationary loudness according to Moore and Glasberg. | The standard is based on the American ANSI S3.4-2007 standard for calculating stationary loudness according to Moore and Glasberg. | ||