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Work item:
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P.700 (ex P.Loudness)
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Subject/title:
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Calculation of loudness for speech communication
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Status:
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Approved on 2019-06-29 [Issued from previous study period]
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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New
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Equivalent number:
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-
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Timing:
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-
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Liaison:
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3GPP, ETSI
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Supporting members:
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-
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Summary:
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This Recommendation describes a unified method required for calculating loudness, allowing comparison of narrow-band (300-3.4k Hz), wideband (100-8k Hz), super-wideband (50-14k Hz) and Fullband (10-20k Hz) telephony, for all types of terminals including handset, hands-free and conference terminals.
The model described in this Recommendation is consistent when switching from one bandwidth to another and independent of the listening situation (handset, headset, hands-free …) with regards to producing a constant perceived loudness.
Compered to loudness rating models, like the one presented in Recommendation ITU-T P.79, the present method predicts the absolute loudness, considers auditory masking and is applicable to a wide range of acoustic levels.
This Recommendation incorporates a number of annexes that hold test vectors for validation of loudness model implementations as well as of the descriptions and results of the loudness experiments that form the basis for this Recommendation.
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Comment:
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Adaptation of psychoacoustic based loudness algorithms aiming to determine the loudness for all bandwidths ranging from narrowband to fullband audio signals.
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Reference(s):
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Historic references:
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Contact(s):
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| ITU-T A.5 justification(s): |
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First registration in the WP:
2016-07-07 15:48:56
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Last update:
2019-07-02 16:18:31
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