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Appl. Sci. 2018, 8(1), 59; https://doi.org/10.3390/app8010059

Automatic Speech-to-Background Ratio Selection to Maintain Speech Intelligibility in Broadcasts Using an Objective Intelligibility Metric

Acoustics Research Centre, University of Salford, Salford M5 4WT, UK
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Received: 13 November 2017 / Revised: 21 December 2017 / Accepted: 27 December 2017 / Published: 3 January 2018
(This article belongs to the Section Acoustics and Vibrations)
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Abstract

While mixing, sound producers and audio professionals empirically set the speech-to- background ratio (SBR) based on rules of thumb and their own perception of sounds. There is no guarantee that the speech content will be intelligible for the general population consuming content over a wide variety of devices, however. In this study, an approach to automatically determine the appropriate SBR for a scene using an objective intelligibility metric is introduced. The model-estimated SBR needed for a preset minimum intelligibility level was compared to the listener-preferred SBR for a range of background sounds. It was found that an extra gain added to the model estimation is needed even for listeners with normal hearing. This gain is needed so an audio scene can be auditioned with comfort and without compromising the sound effects contributed by the background. When the background introduces little informational masking, the extra gain holds almost constant across the various background sounds. However, a larger gain is required for a background that induces informational masking, such as competing speech. The results from a final subjective rating study show that the model-estimated SBR with the additional gain, yields the same listening experience as the SBR preferred by listeners. View Full-Text
Keywords: speech intelligibility; objective intelligibility metric; broadcasting; object-based audio speech intelligibility; objective intelligibility metric; broadcasting; object-based audio
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Tang, Y.; Fazenda, B.M.; Cox, T.J. Automatic Speech-to-Background Ratio Selection to Maintain Speech Intelligibility in Broadcasts Using an Objective Intelligibility Metric. Appl. Sci. 2018, 8, 59.

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