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.

Method and device for the natural-language recognition of a vocal expression

Abstract: The invention relates to a method and a device for the natural-language recognition of a vocal expression. A vocal expression of a person is detected and converted into a voice signal to be processed by a voice recognition device. Afterwards, the voice signal is analyzed at the same time or sequentially in a plurality of voice recognition branches of the voice recognition device using a plurality of grammars, wherein the recognition process is successfully completed if the analysis of the voice signal in at least one voice recognition branch supplies a positive recognition result.

Vorrichtung und Verfahren zur sprecherunabhängigen Sprachnamenwahl für Telekommunikations-Endeinrichtungen

Abstract: The invention relates to a device and to methods for speaker-independent spoken name dialing for telecommunications terminals One of the methods relates to the establishment of an individual name and telephone number directory for spoken name selection whilst the other relates to the carrying out of the spoken name dialing The device has a memory (6) which is supplied with alphanumerically input user-defined names and associated telephone numbers A grapheme-phoneme converter (8) produces a corresponding digital word model from an input name and said digital word model is stored together with the ASCII text or a code designated thereto in such a way that it can be accessed by a speech recognition device (7) The automatic spoken name dialing is carried out as follows: an acoustically input name is conveyed to the speech recognition device (7) in the form of a digital voice signal and the speech recognition device (7) compares this signal with the predetermined word models The ASCII text corresponding to the word model which best matches the voice signal or the designated code is determined Said ASCII text or code enables the associated telephone number to be called up from the memory (6) A telecommunications connection is then automatically established with this telephone number by the calling device (2) of the terminal

Effects of Network Node Consolidation in Optical Access and Aggregation Networks on Costs and Power Consumption

Abstract: The increasing demand for higher bit rates in access networks requires fiber deployment closer to the subscriber resulting in fiber-to-the-home (FTTH) access networks. Besides higher access bit rates optical access network infrastructure and related technologies enable the network operator to establish larger service areas resulting in a simplified network structure with a lower number of network nodes. By changing the network structure network operators want to benefit from a changed network cost structure by decreasing in short and mid term the upfront investments for network equipment due to concentration effects as well as by reducing the energy costs due to a higher energy efficiency of large network sites housing a high amount of network equipment. In long term also savings in operational expenditures (OpEx) due to the closing of central office (CO) sites are expected. In this paper different architectures for optical access networks basing on state-of-the-art technology are analyzed with respect to network installation costs and power consumption in the context of access node consolidation. Network planning and dimensioning results are calculated for a realistic network scenario of Germany. All node consolidation scenarios are compared against a gigabit capable passive optical network (GPON) based FTTH access network operated from the conventional CO sites. The results show that a moderate reduction of the number of access nodes may be beneficial since in that case the capital expenditures (CapEx) do not rise extraordinarily and savings in OpEx related to the access nodes are expected. The total power consumption does not change significantly with decreasing number of access nodes but clustering effects enable a more energyefficient network operation and optimized power purchase order quantities leading to benefits in energy costs.

Codes over tori

Abstract: In this correspondence it is shown how the elements of finite fields when mapped on the surface of a torus can be used for block coding over a three-dimensional signal space. The block codes are useful for data transmission using the recently defined Mannheim distance.

System for transmitting high-speed added-value services in terrestrial digital broadcasting

Abstract: The invention relates to a broad-band multi-frequency block X-DAB transceiver system for interference-free transmission of high data speed value-added services to mobile receivers in an analog TV channel. The system provides considerable flexibility with regard to error control profiles and therefore data rates, and enables unbalanced error control profiles and hierarchic transmission to be carried out. The invention discloses a method for transmitting high-speed added-value services to mobile subscribers according to the X-DAB system (Extended Digital Broadcasting System) based on several, mainly four, simultaneously broadcast adjacent X-DAB frequency blocks in a common wave network in which relevant service content corresponding to source coded digital input data flow is multiplexed.