Telefonaktiebolaget Lm Ericsson (publ)

Tor Bjorn Minde

Richard Carlsson

Peter Alexander Mustel

Tommy Arngren

Karl Hellwig

Tomas Lagerqvist

Jim Sundqvist

Simon Moritz

Erik Ekudden

Hjalmar Olsson

Anders Tomas Uvliden

Per Anders Karlsson

Hans M Nilsson

Xin Feng

Marika Stålnacke

Stefan Bruhn

Nils Patrik Lundqvist

Olof Lundström

Henrik Makitaavola

Per Gunnar Heikkilang

Visa Fristrom

Ulf T Wahlberg

David Hertz

Rita Ziyi Xu

Hans Hermansson

A method of building a geo-tree includes collecting a plurality of data items having geographic and contextual tags, associating the geographic tags with the contextual tags, clustering the collected data items based on the contextual tags, classifying the clusters based on the contextual tags, building a geo-tree with each classified cluster being associated with a node on the tree and storing the geo-tree.

Method of building a geo-tree

The invention relates to a system for verifying geographical descriptiveness of a media file, such as a picture. The system comprises storage means adapted to store a media file, communication means adapted to send said media file to a plurality of user terminals, and to receive, from the user terminals, data indicating a guessed geographical position with which the user of each user terminal associates the media file. The system also comprises calculation means adapted to determine whether the media file is indicative of a geographical position based on the guessed geographical positions received from the plurality of user terminal.

Method and system for verifying geographical descriptiveness of media file

The present relates to a method and arrangement for controlling streams of participants of a virtual meeting, wherein at least a first participant and a second participant are located in a first location and at least a third participant is located in a second location. The arrangement comprises means for receiving location information associated with identity information for each participant, means for receiving a stream from each participant whereby the stream comprises at least audio and an identity of the respective participant, means for controlling transmission of each received stream separately to said participants based on said location information and identity information such that streams between the participants in the same location are blocked.

Method and arrangement for virtual meeting

A source/channel encoding mode control method in a TDMA radio communication system determines the current type of source signal to be encoded and transmitted, restricts encoding to a class of source/channel encoding modes compatible with the determined type of source signal, determines a quality measure for previously transmitted signals that have been received and decoded, and selects based on the quality measure, the most suitable source/channel encoding mode for the determined class.

Source/channel encoding mode control method and apparatus

A method and system for measuring the speech quality in a mobile cellular telecommunications network using available radio link parameters is disclosed herein. In a preferred embodiment, the method includes receiving a set of radio link parameters, as defined in a standard or otherwise available, such as the BER, FER, RxLev, handover statistics, soft information, and speech energy. Temporal information is obtained from the radio link parameters to create a set of temporal parameters which can be statistically analyzed, for example, for the maximum and minimum, mean, standard deviation, and autocorrelation values for a time interval. The temporal parameters are combined to yield a set of correlated parameters that are more closely related to the speech quality. An estimator then uses the correlated parameters to calculate an estimate for the speech quality. The method of the present invention takes advantage of temporal information and correlated relationships from the transmitted parameters. Furthermore, the method is inherently simple and reliable as compared to prior art methods. Still further, the technique provides a method that allows operators to monitor quality conditions throughout the network.

Speech quality measurement in mobile telecommunication networks based on

An analysis-by-synthesis linear predictive speech coder is described. This speech coder has a synthesis part including an adaptive codebook for generating an adaptive excitation, means for generating a multi-pulse excitation and means for generating a transformed binary pulse excitation. The multi-pulse excitation generating means comprises means for generating pulses in restricted pulse positions. The multi-pulse excitation and the transformed binary pulse excitation are combined.

Analysis-by-synthesis linear predictive speech coder with

A call-setup method in a digital cellular radio communication system determines a plurality of parameters defining the current state of the system. By evaluating and combining these parameters into a communication resource request, a communication resource that best matches the request may be allocated in order to optimize system resource usage and/or service quality.

Call-setup method in a digital cellular radio communication system

Method of coding an excitation pulse parameter sequence

A method of coding a sampled speech signal vector in an analysis-by-synthesis coding procedure includes the step of forming an optimum excitation vector comprising a linear combination of a code vector from a fixed code book and a long term predictor vector. A first estimate of the long term predictor vector is formed in an open loop analysis. A second estimate of the-long term predictor vector is formed in a closed loop analysis. Finally, each of the first and second estimates are combined in an exhaustive search with each code vector of the fixed code book to form that excitation vector that gives the best coding of the speech signal vector.

Double mode long term prediction in speech coding

In a TDMA cellular telephone system, an error concealment method provides parameter interpolation based on soft quality measures that will enhance the speech quality under bad channel conditions compared to prior methods of repeating previous voice data frames. Specifically, the soft technique of the present invention uses a weighted combination of previous and present frame parameters, where the weighting reflects the probability of error. The present invention will improve the masking of errors compared to hard actions based on a binary detection, especially when the binary detection fails or when the received frame is declared as being 'good'. The method can also utilize parameter based soft information without increasing the bitrate.

Soft error concealment in a TDMA radio system

A method and an arrangement for quality estimation when detecting an information frame, for instance a speech frame transmitted in a radio communication system in accordance with time division multiple access (TDMA), although the method can also be applied with frequency divided radio systems. There is used the soft information available in the radio receiver which is intended to detect the speech frame and process this signal information in accordance with those principles applicable to known neural nets. Prior to use, the neural net is aligned to the radio communication system concerned. The invention enables better information relating to possible error in the speech frame to be delivered to error correcting units in the radio receiver.

Method and an arrangement for frame detection quality estimation in the

The invention relates to a method of coding a sampled speech signal vector by selecting an optimal excitation vector in an adaptive code book. This optimal excitation vector is obtained by maximizing the energy normalized square of the cross correlation between the convolution of the excitation vectors with the impulse response of a linear filter and the speech signal vector. Before the convolution the vectors of the code book are block normalized with respect to the vector component largest in magnitude. In a similar way the speech signal vector is block normalized with respect to its component largest in magnitude. Calculated values for the squared cross correlation C.sub.I and the energy E.sub.I and stored corresponding values C.sub.M, E.sub.M for the best excitation vector so far are divided into a mantissa and a scaling factor with a limited number of scaling levels. The number of levels can be different for squared cross correlation and energy. During the calculation of the products C.sub.I .multidot.E.sub.M and E.sub.I .multidot.C.sub.M, which are used for determining the optimal excitation vector, the respective mantissas are multiplied and a separate scaling factor calculation is performed.

Method of coding a sampled speech signal vector

A method for positioning excitation pulses for a linear predictive coder (LPC) operating according to the multi-pulse principle, i.e. a number of such pulses are positioned at specific time points and with specific amplitudes. The time points and the amplitudes are determined from the predictive parameters (a.sub.k) and the predictive residue signal (d.sub.k), by correlation between a speech representative signal (y) and a composed synthesized signal (y). All possible time positions for the excitation pulses within a given frame interval are provided. The possible time positions are divided into a number (n.sub.f) of phase positions and each phase position is divided into a number of phases (f). All phases are vacant for the first excitation pulse. When this pulse has been positioned, the phase determined for this pulse is denied to the following excitation pulses until all pulses in a frame have been positioned.

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Gammelstad, Sweden

Tor Bjorn Minde