Hans Jongebloed

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There are very few, if any, published accounts of practical expe­ rience with Speaker Verification as a means to provide secure access to telematics services. Yet, there is no reason to expect that Speaker Verification is very different from speech recogni­ tion, for which many deployed services have shown the need for close and intensive on-line monitoring(More)
This paper addresses differences between operational spea­ ker verification (SV) systems and laboratory experiments in term s of performance and m ethods for measuring perfor­ mance. It is concluded th a t operational SV systems need an indication of the quality of newly enrolled speaker mod­ els, to decide whether to re-enrol or request more enrolment(More)
There are few operational services that use speaker verification (SV) as a means to provide secure, yet easy to use access. In this paper we describe the first semi-operational service that is offered by KPN Telecom that has been developed within the framework of the LE-4 project PICASSO. We report on the objective and subjective evaluation of a service(More)
1 Abstract We present two user evaluations of a speech centric multimodal Directory Assistance (DA) service that has been implemented on an iPAQ. The service combines speech and pen at the input side with text and speech at the output side. The first user experiment was an expert review. Five usability experts judged the initial design of the multimodal DA.(More)
The on-off and sustaining units in the first optic chiasm of the blowfly visual system are presumably third-order neurons, postsynaptic to the amacrine cells in the lamina. We modelled the cable properties of amacrine cells, and find that these are consistent with two characteristics of the on-off and sustaining units. The first characteristic is their poor(More)
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