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On a Loudness Function of Artificial Speech

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The loudness function of artificial speech necessary for the objective measurement of the reference equivalent was studied. First, the loudness functions of speech and three types of artificial speech having an equi-spectrum to speech were compared. A slight deviation was noticed but the tendency was nearly similar. Secondly, measurements of the reference equivalent on the typical transmission system were made. The differences of the values measured for speech and artificial speech were within about 2 dB on the average, and for the statistical analysis of the dispersion on these values, the differences due to signals were not significant. Accordingly, considering from the viewpoint of loudness, artificial speech is able to approximate the signal having an equi-spectrum to speech and is independent of its contents.

Zusammenfassung

Es wurde die zur objektiven Messung eines äquivalenten Referenzsignals erforderliche Lautstärkefunktion künstlicher Sprache bestimmt. Zunächst wurden die Lautstärkefunktionen von Sprache und von drei verschiedenen Arten künstlicher Sprache mit jeweils Sprache-gleichem Spektrum verglichen. Dabei zeigten sich zwar leichte Abweichungen, die Tendenzen waren jedoch nahezu gleich. Als zweites wurden dann Messungen des äquivalenten Referenzsignals in einem typischen Übertragungssystem durchgeführt. Die Unterschiede zwischen den für Sprache und für künstliche Sprache gemessenen Werten lagen im Mittel innerhalb von 2 dB, ferner waren die auf die Signale zurückzuführenden Unterschiede für die statistische Analyse der Verteilung dieser Werte nicht signifikant. Demzufolge kann vom Standpunkt der Lautstärke ein Sprachsignal unabhängig von seinem Inhalt durch künstliche Sprache gleichen Spektrums approximiert werden.

Sommaire

On a étudié la fonction sonie de la parole artificielle en vue de la mesure objective du niveau de référence équivalent. Dans une première étape on a comparé la fonction de sonie de la parole naturelle avec celles de trois types de paroles synthétiques ayant le même spectre équivalent. On a noté de légères déviations mais des tendances similaires. Dans une seconde étape on a mesuré l'équivalent de référence sur un système de transmission jugé comme typique; on a trouvé que les différences entre parole naturelle et parole artificielle n'excédait pas en moyenne 2 dB et n'étaient nullement significatives du point de vue statistique. On en conclut que, du point de vue sonie, une parole artificielle constitue une approximation parfaitement valable, pourvu qu'elle ait, indépendamment du contenu sémantique, un spectre de fréquences équivalent à celui du signal vocal qu'elle vise à simuler.
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Document Type: Research Article

Publication date: 01 April 1980

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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