This paper addresses differences between operational speaker verification (SV) systems and laboratory experiments in terms of performance and methods for measuring performance. It is concluded that operational SV systems need an indication of the quality of newly enrolled speaker models, to decide whether t o re-enrol or request more enrolment material. We have investigated the impact of ASR errors on model quality. While attempting to design measures for the quality of speaker models we have developed a novel method for assigning weights to the contribution of models in accordance with their discriminative ability.

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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 during the time when the service becomes operational. In this paper we present our expe rience with a monitoring scheme for Speaker Verification dur ing the field test of a financial investment game. Many of the issues that were monitored were suggested by our experience with a semi-operational service, viz. free access to Directory Assistance for visually impaired. A newly developed enrolment procedure, that can flag potentially weak speaker models, is an essential part of the monitoring procedure.

<p>Ecoducts (also known as nature bridges) ensure that the environment in the form of flora and fauna can proceed on its journey undisturbed. These nature bridges usually help nature to cross man made obstacles like highways, national roads, railroads or canals.</p> <p>The year 2006 was a very special year. That year the inauguration of the longest nature bridge took place, called Zanderij Crailo in The Netherlands. The total length of this passage for nature is 800 m. Two concrete bridge constructions with a width of 50 m each form part of this connection enabling undisturbed passage for nature between two natural habitats.</p>