Deutsche Telekom

About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Signal. The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

Verfahren zur präventiven und/oder aktuellen anzeige von übertragungskosten bei der datenübertragung von internet- und onlinedaten

Abstract: Die vorliegende Erfindung schlagt zur praventiven Anzeige von Ubertragungskosten bei Internet- und Onlinediensten fur zumindest die Ubertragung groserer Datenmengen, wie beispielsweise FTP-Dateien, die Einfuhrung eines zusatzlichen Protokollelementes vor, welches anbieterseitig versendet wird, zumindest den Datenumfang der anstehenden Ubertragung sowie optional weitere Preiskriterien enthalten kann, von den an der Vermittlung beteiligten Knoten (Routern) als solches erkannt und um die eigenen anteiligen Ubertragungspreise erweiterbar ist, wobei letztlich im Empfanger-PC, beispielsweise browserseitig, eine Auswertung des Protokollelements mit demgemaser Kostenanzeige auf dem Bildschirm erfolgt, wonach der Kunde eine Ubertragung einleiten oder abbrechen kann und optional weitere Masnahmen, wie beispielsweise das automatische Einleiten der Ubertragung zu einem kostengunstigeren spateren Zeitpunkt aktivieren kann. Insbesondere ist die Einfuhrung des Protokollelements fur alle anstehenden Datenubertragungen, auch beispielsweise HTML-Pages optional sinnvoll, was insbesondere bei schnellen Internetzugangen vor der sinnlosen Zustellung umfangreich bebilderter Seiten schutzt.

Distance transform templates for object detection and pose estimation

Abstract: We propose a new approach for detecting low textured planar objects and estimating their 3D pose. Standard matching and pose estimation techniques often depend on texture and feature points. They fail when there is no or only little texture available. Edge-based approaches mostly can deal with these limitations but are slow in practice when they have to search for six degrees of freedom. We overcome these problems by introducing the distance transform templates, generated by applying the distance transform to standard edge based templates. We obtain robustness against perspective transformations by training a classifier for various template poses. In addition, spatial relations between multiple contours on the template are learnt and later used for outlier removal. At runtime, the classifier provides the identity and a rough 3D pose of the distance transform template, which is further refined by a modified template matching algorithm that is also based on the distance transform. We qualitatively and quantitatively evaluate our approach on synthetic and real-life examples and demonstrate robust real-time performance.

On the cost of concurrency in transactional memory

Abstract: The promise of software transactional memory (STM) is to combine an easy-to-use programming interface with an efficient utilization of the concurrent-computing abilities provided by modern machines. But does this combination come with an inherent cost? We evaluate the cost of concurrency by measuring the amount of expensive synchronization that must be employed in an STM implementation that ensures positive concurrency, i.e., allows for concurrent transaction processing in some executions. We focus on two popular progress conditions that provide positive concurrency: progressiveness and permissiveness. We show that in permissive STMs, providing a very high degree of concurrency, a transaction may perform a linear number of expensive synchronization patterns with respect to its read-set size. In contrast, progressive STMs provide a very small degree of concurrency but, as we demonstrate, can be implemented using at most one expensive synchronization pattern per transaction. However, we show that even in progressive STMs, a transaction has to "protect" (e.g., by using locks or strong synchronization primitives) a linear amount of data with respect to its write-set size. Our results suggest that achieving high degrees of concurrency in STM implementations may bring a considerable synchronization cost.

Energy trade-offs among content delivery architectures

Abstract: It is envogue to consider how to incorporate various home devices such as set-top boxes into content delivery architectures using the Peer-to-Peer (P2P) paradigm. The hope is to enhance the efficienc of content delivery, e.g., in terms of reliability, availability, throughput, or to reduce the cost of the content delivery platform or to improve the end user experience. While it is easy to point out the benefit of such proposals they usually do not consider the implications with regards to the energy costs. In this paper we explore the energy trade-offs of such P2P architectures, data center architectures, and content distribution networks (CDNs) by building upon an energy consumption model of the transport network and datacenters developed in the context of Internet TV (IPTV). Our results show that a CDN within an ISP is able to minimize the overall power consumption. While a P2P architecture may reduce the power consumption of the service provider it increases the overall energy consumption.

A 16, 24, 32 kbit/s wideband speech codec based on ATCELP

Abstract: This paper describes a combined adaptive transform codec (ATC) and code-excited linear prediction (CELP) algorithm, called ATCELP, for the compression of wideband (7 kHz) signals. The CELP algorithm applies mainly to speech, whereas the ATC mode is selected for music and noise signals. We propose a switching scheme between CELP and ATC mode and describe a frame erasure concealment technique. Subjective listening tests have shown that the ATCELP codec at bit rates of 16, 24 and 32 kbit/s achieved performances close to those of the CCITT G.722 at 48, 56 and 64 kbit/s, respectively, at most operating conditions.