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Communication Dans Un Congrès Année : 2020

Difficulties and Successes of the Introduction of Psychoacoustic Indicators in the Industrial World

Résumé

Laboratory of Mechanics and Acoustics (LMA) worked for several years with the French railway company (SNCF) and the telecommunication operator Orange. These collaborations had different consequences in terms of applications. LMA and SNCF worked together on annoyance, loudness, and on detection of emerging signals in noise. From the knowledge provided by this cooperation, but also from the state of the art, SNCF tried to integrate loudness in the standard used in the railway domain (ISO-EN-3381). But it was not accepted for various reasons: suppliers are used to use 1/3 octave bands and dB(A) in their models for interior prediction, loudness is too complicated to calculate. However, SNCF included in its own specification loudness density and loudness for the comfort, but without penalty. Concerning emergent signals, a method measuring tonality was included in the standard, but it is a simplified method which does not work for multicomponent signals. In telecommunications, loudness of speech is one of the main parameters for a good listening quality. For 30 years, the Loudness Rating (LR) has been used to evaluate loudness at sending and receiving terminals. This indicator was first developed for narrow-band (0.3-3.4kHz) handset terminals, then extended to wideband (0.1-8kHz). But it failed in predicting loudness in wideband and has not been extended to larger bandwidths. Orange Labs highlighted the problem several years ago and proposed collaboration with LMA to study how it would be possible to use loudness instead of LR, through a PhD supervised jointly. Orange Labs proposed a model to ITU-T, where SG12 eventually adopted a new standard (P.700) in which loudness is calculated using the ISO-532B model adapted for telephonometry. This standard is valid for all bandwidths and all conditions (handset, handfree, teleconference). Now Orange Labs use ITU-T P. 700 and ask their suppliers to characterize their products using loudness.
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Dates et versions

hal-03234224 , version 1 (26-05-2021)

Identifiants

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Sabine Meunier, Guy Rabau, Vincent Barriac, Vincent Plapous, Fabrice Aubin, et al.. Difficulties and Successes of the Introduction of Psychoacoustic Indicators in the Industrial World. Forum Acusticum, Dec 2020, Lyon, France. pp.2425-2432, ⟨10.48465/fa.2020.0514⟩. ⟨hal-03234224⟩
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