Searched for: author%3A%22van+Wijngaarden%2C+S.J.%22
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van Wijngaarden, S.J. (author), Drullman, R. (author), TNO Defensie en Veiligheid (author)
Although the speech transmission index STI is a well-accepted and standardized method for objective prediction of speech intelligibility in a wide range of environments and applications, it is essentially a monaural model. Advantages of binaural hearing in speech intelligibility are disregarded. In specific conditions, this leads to considerable...
article 2008
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van Wijngaarden, S.J. (author), van Balken, J.A. (author)
A novel approach for disrupting offensive chants at sporting events is proposed, based on attacking synchronization between individuals. Since timing is crucial for coordination between chanters, disruption of timing is expected to be effective against undesired chants. Delayed auditory feedback is known to disrupt timing in individual sound...
article 2007
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van Wijngaarden, S.J. (author), Verhave, J.A. (author), TNO Defensie en Veiligheid (author)
conference paper 2006
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van Erp, J.B.F. (author), Kooi, F.L. (author), Bronkhorst, A. (author), van Leeuwen, D.L. (author), van Esch, M. (author), van Wijngaarden, S.J. (author), TNO Defensie en Veiligheid (author)
Our sensory modalities are specialized in perceiving different attributes of an object or event. This fact is the basis of the approach towards multimodal interfaces we describe in this paper. We rated the match between 20 possible information attributes (common in human computer interaction) and the visual, auditory and tactile sensory systems....
conference paper 2006
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van Wijngaarden, S.J. (author), Drullman, R. (author)
Although the speech transmission index (STI) is a well-accepted and standardized method for objective prediction of speech intelligibility in a wide range of-environments and applications, it is essentially a monaural model. Advantages of binaural hearing to the intelligibility of speech are disregarded. In specific conditions mis leads to...
article 2006
document
van Wijngaarden, S.J. (author), Verhave, J.A. (author), TNO Defensie en Veiligheid (author)
Traffic tunnels are generally hostile acoustic environments, both in terms of reverberation and ambient noise levels. Public address (PA) systems used to convey spoken warnings must meet stringent design requirements in order to produce sufficiently intelligible speech. To be able to predict PA system performance at tunnel design time, two di...
article 2006
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van Wijngaarden, S.J. (author), TNO Defensie en Veiligheid (author)
article 2006
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TNO Defensie en Veiligheid (author), Boer, L.C. (author), van Balken, J.S. (author), van Wijngaarden, S.J. (author)
De verkeersleider kan weggebruikers in een tunnel aansturen met omroepberichten. De berichten worden van tevoren opgenomen met studiokwaliteit, en vervolgens met één druk op de knop afgespeeld. Automobilisten zullen zo’n bericht eerder begrijpen; en ook neemt de werkbelasting van de verkeersleider af, hetgeen de veiligheid vooral bevordert bij...
report 2006
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van Wijngaarden, S.J. (author), Bronkhorst, A.W. (author), Boer, L.C. (author), TNO Defensie en Veiligheid (author)
Auditory evacuation beacons can be used to guide people to safe exits, even when vision is totally obscured by smoke. Conventional beacons make use of modulated noise signals. Controlled evacuation experiments show that such signals require explicit instructions and are often misunderstood. A new signal was designed that combines a chime sound...
article 2005
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Boer, L.C. (author), van Wijngaarden, S.J. (author), TNO Defensie en Veiligheid (author)
Fire and smoke in a tunnel are dangerous because people get disoriented, blinded, and finally suffocate. When such a situation occurs (despite all precaution), sound beacons over the emergency exits could be a great help, reducing escape time through smoke. We let human participants "find refuge" from a road tunnel in dense (cosmetic) smoke....
conference paper 2005
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TNO Defensie en Veiligheid (author), van Gils, B.J.C.M. (author), van Wijngaarden, S.J. (author), van Buuren, R. (author)
Nearly all types of military speech communication involve the use of so-called (narrow band) voice coders or vocoders. Usually the Speech Transmission Index (STI) uses artificial test signals, which can not be reproduced by vocoders with the usual fidelity. Therefore the STI is not able to evaluate vocoders at this time. Although it is...
conference paper 2005
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TNO Defensie en Veiligheid (author), Beerends, J.G. (author), van Wijngaarden, S.J. (author), van Buuren, R.A. (author)
ITU-T recommendation P.862 PESQ was developed for assessing speech quality. The basic idea in PESQ is to compare a reference speech signal with the degraded signal through a psycho-acoustic model and a model of human quality comparison (cognitive model). Within NATO, testing of low bit rate speech codecs is more focused on speech intelligibility...
conference paper 2005
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van Wijngaarden, S.J. (author), Bronkhorst, A.W. (author), Houtgast, T. (author), Steeneken, H.J.M. (author), TNO Technische Menskunde (author)
While the Speech Transmission Index ~STI! is widely applied for prediction of speech intelligibility in room acoustics and telecommunication engineering, it is unclear how to interpret STI values when non-native talkers or listeners are involved. Based on subjectively measured psychometric functions for sentence intelligibility in noise, for...
article 2004
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van Wijngaarden, S.J. (author), Houtgast, T. (author)
The Speech Transmission Index (STI) is routinely applied for predicting the intelligibility of messages (sentences) in noise and reverberation. Despite clear evidence that the STI is capable of doing so accurately, recent results indicate that the STI sometimes underestimates the effect of reverberation on sentence intelligibility. To...
article 2004
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TNO Technische Menskunde (author), van Wijngaarden, S.J. (author)
Bij de experimenten is voorbijgegaan aan de dynamische, adaptieve aspecten van spraakcommunicatie: luisteraars geven (bijvoorbeeld door interrupties, of door hun gezichtsuitdrukking) aan wanneer de verstaanbaarheid te wensen overlaat. Sprekers reageren hierop, bijvoorbeeld door duidelijker en langzamer te spreken. Dergelijke effecten zijn niet...
doctoral thesis 2003
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TNO Technische Menskunde (author), Boer, L.C. (author), van Wijngaarden, S.J. (author)
Purpose: Can people lost in dense smoke be guided by sound? In a previous test with (commercially available) sound beacons over the emergency exits of a tunnel barely 20% found the exits; "unacceptable" according to the Centre for Tunnel Safety of the Civil Engineering Division of the Directorate-General for Public Works and Water Management....
report 2003
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Tardelli, J.D. (author), van Wijngaarden, S.J. (author), Hassanein, H. (author), Collura, J.S. (author), TNO Technische Menskunde (author)
A precision-weighted rank-ordering procedure was developed for the combination of voice coder subjective evaluation results to provide a final measure of performance for the reference and candidate coders in the NATO 1200/2400 bps coder selection project. The combination procedure is based on calculated error-propagation, and precision-weighted...
conference paper 2002
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van Wijngaarden, S.J. (author), Lopatka, J. (author), van Buuren, R. (author), TNO Technische Menskunde (author)
When developing international standards for voice coding algorithms, it should be kept in mind that many different languages are likely to be used. Narrow band voice coders are sometimes subjectively experienced to suffer from language dependency: the performance of a coder (in terms of speech intelligibility) may depend on the language spoken....
conference paper 2002
document
van Wijngaarden, S.J. (author), Steeneken, H.J.M. (author), Houtgast, T. (author), TNO Technische Menskunde (author)
article 2002
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van Wijngaarden, S.J. (author), Tardelli, J.D. (author), Hassanein, H. (author), Ray, B. (author), Collura, J.S. (author), TNO Technische Menskunde (author)
Traditionally, the performance of low bit rate coders was measured by two performance characteristics, namely quality and intelligibility. However, those characteristics are not adequate for measuring the performance over a realistic communication link, where factors such as hannel conditions (errors, delay, etc.), dynamic speaker compensation ...
conference paper 2002
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