Interdigital Ce Patent Holdings

Interdigital Madison Patent Holdings, Sas

Thomson Licensing

Interdigital Madison Patent Holdings

Anthony Pesin

Loic Fontaine

Ali Louzir

John Sidney Stewart

Jean-Yves Le Naour

Jean-Pierre Bertin

Goulven Querre

Thomas Morin

Jean-Marc Le Foulgoc

Marc Louchkoff

Claude Fouque

Abdullah Haskou

Loïc Fontaine

In situations where a receiver, rendering a content, switches from a first transport stream carrying that content to a second transport stream carrying that same content, artefacts may occur on the rendered content while transitioning between both transport streams. Considering transport stream data of a transport stream signal may be available at a nominal frequency higher than a frequency corresponding to the transport stream bitrate, there may be some periods of time during which no data is present in the transport stream signal. A salient idea is to switch from the first transport stream signal to the second transport stream signal in such periods during which there is no transport stream valid data in the first transport stream signal, allowing to minimize the risks of perceptible defects in the rendered content throughout the switching.

Method and apparatus for switching from a first to a second transport stream of same content

A method for processing a stream of data represented by a plurality of symbols associated with a constellation. The method includes applying a symbol constellation extension projection to at least one of the plurality of symbols, the symbol constellation extension projection having an outward angular region, the outward angular region defined by a value of an angle, and the value of the angle equal to or less than an angular distance between two symbols in the constellation. The value of the angle is based on a constellation and a code rate used for encoding and transmitting the stream of data.

Apparatus and method for reducing peak to average power ratio in a signal

The disclosure relates to a method comprising: receiving, from a first network, a input signal conveying a plurality of audio and/or video channels; sending, on a second network, a first signal comprising a first digital stream conveying a first audio and/or video channel comprised in the input signal, the first signal comprising, for a second channel of said plurality of audio and/or video channels other than the first channel, and a second digital stream comprising an identifying information of the other second channel and requiring less bandwidth than a digital stream conveying the other second audio and/or video channel of the input signal. It also relates to a method comprising: receiving via a first network a digital signal comprising a plurality of streams, one stream conveying a channel, converting the digital signal to a signal; outputting the signal to a tuning device; upon obtaining a channel identifier representative of a tuning, sending, via the first network, a channel change request comprising the channel identifier to a transmitter of the digital signal. It also relates to corresponding signal, devices, system, computer readable program products and storage media.

Methods for processing audiovisual streams and corresponding devices, electronic assembly, system, computer readable program products and storage media

Methods and apparatuses for processing a signal that is transmitted with a reduced peak to average power ratio are described. The processing includes applying () a symbol constellation extension projection to at least one symbol in the constellation, the symbol constellation extension projection having an outward angular region from an original position for the at least one symbol in the constellation, the outward angular region defined by a value for an angle between a first boundary and a second boundary for the outward angular region, the value for the angle determined by a selection of the constellation used as part of the transmitted signal and a code rate used for encoding the stream of data.

A method and apparatus for receiving a reduced peak to average power ratio signal is disclosed. The method includes receiving a signal, the signal being processed prior to transmission to reduce peak to average power ratio, determining a processing mode used to reduce the peak to average power ratio of the received signal, and reducing the amplitude level for a portion of the received signal using constant modulus clipping if the processing mode includes a two-dimensional constellation extension. The apparatus includes a processing circuit that receives a signal, the signal being processed prior to transmission to reduce peak to average power ratio, and a limiter circuit that determines a processing mode used to reduce the peak to average power ratio of the received signal and reduces the amplitude level for a portion of the received signal using constant modulus clipping if the processing mode includes a two-dimensional constellation extension.

Method and apparatus for receiving a reduced peak to average power ratio signal

Methods and apparatuses for processing a signal that is transmitted with a reduced peak to average power ratio are described. The processing includes applying () a first type of symbol constellation extension projection to at least one symbol in the constellation if it is determined that a type of constellation is a non-square constellation, the first type of symbol constellation extension projection having an outward angular region from an original position for the at least one symbol in the constellation, the outward angular region defined by a value for an angle between a first boundary and a second boundary for the outward angular region.

A broadcast TV signal is a DVB-T2 based system. A DVB-T2 transmitter checks OFDM symbols before transmission to determine a level of adjacent channel interference (ACI). If the of level of ACI is too high, i.e., above a threshold value, the OFDM symbols are filtered before transmission. Otherwise, the OFDM symbols are transmitted without filtering. A filtering field is added to an LI pre-signaling table of the broadcast DVB-T2 signal to signal a DVB-T2 receiver when the received OFDM symbols have been filtered.

Filtering identifier for an OFDM system

A Multi-tuner reception system includes at least a first tuner and a second tuner. The first tuner is adapted to translate a frequency of a first received signal into a first translated frequency. The first tuner includes a first local oscillator operating at a first local oscillator frequency. The second tuner is adapted to translate a frequency of a second received signal into a second translated frequency. The second tuner includes a second local oscillator operating at a second local oscillator frequency. The second local oscillator frequency is equal to a sum of the first local oscillator frequency and a continually time variable offset frequency.

Signal reception multi-tuner system and corresponding method

Method for controlling a display device in an electronic device and associated control device. The electronic device includes a control unit and the display device comprising a plurality of display elements, a display controller and a switching circuit. The display elements have a plurality of pictograms. The display controller having a plurality of storage elements associated with the display elements. The method includes the steps of writing into the storage elements of a contents for display on the display elements, the configuration in standby mode of the electronic device making the storage elements associated with the display elements by the control unit inaccessible, the detection of an event to be indicated by display, and the control of a switching circuit to vary the active pictograms by alternately displaying the contents of at least two of the storage elements on the same display element.

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Cesson Sevigne, France

Anthony Pesin