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France Telecom

Etat Francais

Telediffusion De France

France Telecom Sa

Telediffusion De France S.a.

Michel Veillard

Dominique Curet

Stephanie Relier

Germain Lolivier

Therese Garault

Gerard Hellegouarch

Andre Douteau

Gerard Madec

Patrice Senn

Claudia Becker

Alexandre Cotarmanac'h

Benoit Besset

Gerard Duvic

Laurent Paris

Benoît Besset

A method for synchronising a first audio stream, reproduced in the form of a sound signal by a reproduction device near a terminal, with an alternative audio stream received by the terminal. The terminal also receives a control stream representing the first audio stream reproduced on the reproduction device, the control stream and the alternative audio stream being synchronised according to a single time reference. the method includes: capturing a portion of the sound signal; transmitting to the reproduction device a command to suspend the reading of the first stream; obtaining a first data item representing at least one portion of the captured sound signal; detecting the first data item in the control stream and, when the first data item is detected in the control stream, transmitting to the reproduction device a command to resume reading the first stream; and reproducing the alternative audio stream received by the terminal.

Method for synchronizing an alternative audio stream

The invention regards a method for broadcasting multimedia signals towards a plurality of terminals as a data flow comprising successive packets, being organised into sessions, a session comprising a set of packets forming a whole, at least some of said sessions being transmitted under several versions, corresponding to different starting moments. According to the invention, such a method implements a mechanism for merging versions of a same session, so that at least two versions starting at different moments use, at first, session portions which are peculiar to them, and, subsequently, a shared session portion.

Method for broadcasting multimedia signals towards a plurality of terminals

The video component(s) of a digital audio-visual first program are switched onto the video components of a second digital, audio-visual program by (1) switching onto the video component of the second program, subsequent to the switch command and to the end of a picture of the first program, and (2) replacing, as seen in the order of transmission, each non Intra picture of the component of a second program, with a picture having coding performed independently of (a) the picture data of the replaced picture and (b) of the contents of the pictures to which it refers until the beginning of the next Intra picture of the component of the second program.

Method switching the video component(s) of a first digital, audio-visual program onto the video components of a second audio-visual digital, video-audio program to compensate their phase-shift

First digital audio-visual program video component(s) are switched on a second digital audio-visual program video component(s) by switching on the beginning of the first set of images including an Intra-coded picture of the second program video component encountered after the switching command. In the transmission order of images, each bidirectionally predictive-coded picture of the first set of images referring to the set of images pertaining to the set of images preceding it before switching, is substituted for a bidirectionally predictive-coded picture of the video coding which is produced independently of (1) the substituted image content and (2) the contents of the images to which it refers.

Method for switching a first digital audio-visual program video component(s) on a second digital audio-visual program video component(s)

Circuit for producing analog primary signals of a television signal from its digital luminance and chrominance components comprising in series an interpolating digital filter, a digital dematrixer and three digital - analog converters. The interpolating digital filter carried out an oversampling of the luminance signal Y in a ratio of 2 and an oversampling of each chrominance signal CR, CB in a sampling ratio such that the sampling frequency of the luminance and chrominance digital signals has the same sampling frequency. The digital dematrixer produces the primary digital color signals from the oversampled luminance and chrominance components.

Circuit for producing analog signals of primary colors of a television

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Bruz, France

Michel Veillard