Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Gmbh

Sony Corporation

Sony Mobile Communications Ab

Bjorn Martin Lindquist

Kjell Berthold Gustafsson

Martin Isberg

Paul W Dent

Torsten John Carlsson

Peter Jakobsson

Heino Jean Wendelrup

Jacob Mannerstrangle

Henrik Bengtsson

Bo Hakan Larsson

Markus Andreasson

Olivier Moliner

Hans Hagberg

Jan Celander

Hangkan Bengt Eriksson

Martin Sallenhag

H Magnus Hansson

Lars Peter Kunkel

Lars-Peter Kunkel

Kar-Fat Poon

Niclas Ogren

Bo Kenneth Ekman

Stefan Lidbrink

Kenneth Schonfeldt

Methods, portable electronic devices, systems and computer program products are provided for automatically creating a social networking service (SNS) session. The methods include generating at and transmitting from a first device a first audio and/or video fingerprint of an audio and/or video event. The first audio and/or video fingerprint has a first predetermined length (T). A second audio and/or video fingerprint is periodically transmitted to a server from the first device. The second audio and/or video fingerprint has a second predetermined length (t), smaller than the first predetermined length (T), and includes data associated with the audio and/or video event that is later in time than data included in the first audio and/or video fingerprint. The first device is joined to an SNS session, automatically created by the server, responsive to receipts at the server, of a third audio and/or video fingerprint having the first predetermined length (T) from a second device that includes a portion of the first audio and/or video fingerprint or the second audio and/or video fingerprint periodically transmitted from the first device.

Methods, portable electronic devices, systems and computer program products for automatically creating social networking services (SNS)

The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.

Multi-frequency band receiver for RF signal

A multiple-mode receiver incorporating direct conversion (processing received signals using intermediate frequencies within the same frequency range as the received signal bandwidth) rather than superheterodyne circuitry, allowing receiver hardware components to be re-used rather than replicated for each band. Various embodiments are disclosed in which low pass filters, mixers, quadrature generators, oscillators, and amplifiers are re-used.

Multiple-mode direct conversion receiver

A .DELTA..SIGMA. controlled phase locked loop modulation is used with limited oversampling factors while fulfilling the spectrum and/or phase noise requirements on the modulation in the phase locked loop. By filtering the quantization noise sufficiently then compensating for the distortion of the modulation at the input of the .DELTA..SIGMA. modulator, the required oversampling factor of the .DELTA..SIGMA. controlled phase locked loop modulators can be reduced without loss of performance. The distortion is mitigated by performing a compensation at the input to the .DELTA..SIGMA. modulator. The noise reduction obtained by lowering the bandwidth of the phase locked loop can then be traded to reduce the oversampling factor.

Compensated .DELTA..SIGMA. controlled phase locked loop modulator

A method and apparatus for reducing power consumption in a communication device. In a standby mode, a relatively high power clock with a high degree of accuracy is powered down and a lower power, low frequency clock is used to maintain system synchronization. Synchronization means are provided to improve the accuracy of the low frequency clock during the standby mode.

Method and apparatus for reducing standby current in communications

A method for processing a signal modulated with information symbols to account for an additive offset and slope is disclosed. First, an initial estimate of offset and slope is made and hypotheses of all possible values of a sequence of one or more information symbols are then made. For each of said hypotheses, the associated data symbol sequence is used to make an improved estimate of offset and slope and the improved estimate of offset and slope are stored against each of the hypotheses. For each hypothesis, the improved estimate of offset and slope is used in calculating an expected signal value and a mismatch between a sample of the modulated signal and the expected value is computed. The hypotheses are then sequentially extended by one symbol, the slope and offset estimates arc updated and the mismatches are accumulated to form a path metric value for each extended hypothesis, and resolving between said hypotheses based on said path metric values using a Viterbi Sequential Maximum Likelihood Sequence Estimation process to produce a most likely hypothesis of said modulated information symbols substantially unimpaired by said additive slope and offset.

Slope, drift and offset compensation in zero-IF receivers

A battery charger charges a battery in a portable chargeable electronic device, such as a cellular phone, with a long-term-constant current, even while the device is used. The charging current is controlled by circuitry in the portable device, avoiding the need for control circuitry in the battery charger or battery. A battery-charger connector that corresponds to the type of battery in the portable device is keyed to fit only a charger that matches the type of battery, thus assuring proper charging of the battery. Alternatively, a simple contact connects the battery charger to the battery. A belt clip covers the battery-charger connector when the battery charger is disconnected to prevent short-circuiting the battery.

Method and apparatus for controlling a charging current of a battery in

A digitally compensated direct-conversion receiver includes devices for generating digital samples of a base-band in-phase signal and a base-band quadrature signal and for detecting the presence of a second-order product signal produced by an amplitude-modulated interfering signal. Also, the apparatus comprises a device for digitally compensating the digital samples by removing the second-order product signal, thereby producing compensated digital samples. In one method of digitally compensating samples of an information signal quadrature-modulating a carrier signal, estimated samples of a second-order product from a switched carrier signal are formed by averaging the digital samples during two time periods and by determining a time of ramps in the in-phase and quadrature signals that occur between the time periods due to the interfering signal. The digital samples may be differentiated and the results smoothed in determining the time of the ramps. In another apparatus, the estimated samples of the second-order product signal are produced by a device for averaging a square of a difference between respective digital samples of the in-phase signal and the quadrature signal, thereby determining an amplitude of the amplitude-modulated carrier signal, and a device for combining the amplitude and the digital samples, thereby generating the estimated samples.

Digitally compensated direct conversion receiver

A method for processing a signal modulated with information symbols to account for an additive offset and slope is disclosed. First, an initial estimate of offset and slope is made and hypotheses of all possible values of a sequence of one or more information symbols are then made. For each of said hypotheses, the associated data symbol sequence is used to make an improved estimate of offset and slope and the improved estimate of offset and slope are stored against each of the hypotheses. For each hypothesis, the improved estimate of offset and slope is used in calculating an expected signal value and a mismatch between a sample of the modulated signal and the expected value is computed. The hypotheses are then sequentially extended by one symbol, the slope and offset estimates are updated and the mismatches are accumulated to form a path metric value for each extended hypothesis, and resolving between said hypotheses based on said path metric values using a Viterbi Sequential Maximum Likelihood Sequence Estimation process to produce a most likely hypothesis of said modulated information symbols substantially unimpaired by said additive slope and offset.

Slope drift and offset compensation in zero-IF receivers

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Bjarred, Sweden

Bjorn Martin Lindquist