Telediffusion De France

Thales

Denis Masse

Jamal Baina

Gabriel Goudezeune

François Pipon

Pierre Bretillon

Patrice Bourcet

Jamal Baïna

Michel Richard

Philippe Hocquard

Jean-Francois Travers

Rym Mhiri

Bruno Jahan

A method is provided for broadcasting a data stream in a network including at least two separate transmitters supplied by a head end. The stream is organized into data frames and includes at least one time marker. The method includes the following steps at the head end: obtaining a first time reference from an external source; obtaining a second time reference from the data stream received by the head end; comparing the first and second time references in order to determine a time shift between the first and second time references; and transmitting the time shift or at least one time marker modified on the basis of the time shift in order to compensate for a transport time variation between the head end and the transmitters.

Method for broadcasting a data stream based on time lag in a network including a plurality of transmitters, computer program product, head-end system for implementing said method

A method of demodulating a signal in a transmission system where the modulation includes several substantially orthogonal subcarriers, and the vector of the propagation channel H[n,k] is known or the received signal includes at least pilot symbols emitting reference data. The method includes at least one step of estimating the symbol a[n,k] emitted on the ksubcarrier of the nsymbol of the modulation using a recombination step weighting the various signals received after synchronization and demodulation x[n,k].

Method of demodulating OFDM type signals in the presence of strong co-channel interference signals

The invention relates to a method of synchronizing first and second digital signals presenting digital elements to be put into correspondence, on the basis of time references. The method includes preliminary synchronization of the two digital signals using time references, by putting time references recognized as having the same value in the first and second digital signals into correspondence; and fine synchronization on the basis of a characteristic parameter obtained from the binary streams of the digital elements, and computed for each of the first and second digital signals.

Method for synchronizing digital signals

Method and system for assessing, at reception level, the quality of a digital signal, such as a digital audio/video signal

The invention relates to a method and to a system for measuring the quality of digital television signals comprising a data stream, the method including measuring quality and producing measurement signals that are representative of quality. The method comprises the following steps: a) selecting a reference time signal (PCR) from the data stream; b) generating a multibit digital clock signal (STC&prime;) from the reference time signal, the phase of the clock signal being locked on the basis of the reference time signal (PCR) and its count being deduced unambiguously from the count of an initial time base (STC); and c) labelling the measurement signals with at least some of the bits (HDT) of the digital clock signal that are meaningful given the nature of the measurements performed.

Method and system for measuring the quality of digital television signals

System for broadcast of data in an audio signal by substitution of

Growing community of inventors

Rosselange, France

Denis Masse