System of audioconference by telephone link up

Details System of audioconference by telephone link up System of audioconference by telephone link up

H - Electricity

04

M

379/44

H04M 3/56 (2006.01)

Patent

CA 1093719

ABSTRACT OF THE DISCLOSURE: The object of the invention is to provide an audio- conference system in which the acoustic residual level due to self-priming is totally eliminated in the transmit channel, which, as a corollary, allows any amplification of the audio- frequency signals transmitted. After preamplification, the audiofrequency signals coming from each group of a specific number of microphones equidistributed around the center of the table are given a phase shift which is equal for a given micro phone to the polar angle of the microphone around the table. If the number of microphones is an even number, the microphones are grouped by pairs of two microphones diametrically opposite with respect to the loudspeaker assembly. The of the micro- phones of the pair is connected directly to a mixing circuit and the other microphones of the pair is connected through a 180° phase shifter to the miwing circuit. Thus, the components of the signal resulting from the coupling between the loud- speaker and the microphones are cancelled during the mixing operation of the two output signals of the microphones. Another arrangement prevents the cutting short of a conferee who has begun to speak. The identification device associated with a table in an audioconference system complying with the invention is not based on the comparison of the acoustic levels of the speakers' voices but, on the contrary, on the intervention speed of the speaker wishing to take the floor. In other words, once a speaker begins talking with a voice the acoustic level of which is above a first predetermined acoustic threshold, he will keep his turn to speak so far as his voice is above a second predetermined acoustic threshold lower than the first threshold whatever the acoustic levels of the other speakers' voices. In addition, the detection assembly makes it possible not to change the identification of the speaker during speaking when only brief interruptions occur in the audiofrequency signal from the speaker corresponding to intervals between syllables or words.

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