SO UH THIS WAS KIND OF THE LOWEST LAYER MM-HMM NOW THIS IS A LAYER JUST ABOVE IT WHICH MIGHT INTEREST YOU UM IF YOU REPEAT THAT OVER TIME YOU WILL SEE PATTERNS UM FOR EXAMPLE UH AT TWO DIFFERENT LOCATIONS 'KAY SO YOU CAN YEAH OKAY SO YOU CAN CLUSTER THOSE ENTER UH WHEN USER IS AND YOU WILL SEE THAT UH IF IT'S LONG ENOUGH IT'S SOME SIGNIFICANT EVENT UM THIS CAN BE DONE QUITE CHEAPLY YEAH UH YES AND BEFORE I FORG FORGET IT UH I HAVE ONE QUESTION UH YOU SAY YOU DO THE PROCESSING AFTER UH AFTERWARDS AND UH WHAT IS THE THE COST YES THE THE LENGTH ONE ONE OR UH BIT LONGER SO IT'S NOT PERFECT IT'S LIKE THREE FOUR YEAH BUT NOT EVERYTHING IS UH UM SIMPLE LINEAR ESPECIALLY THIS PART IT'S DEFINITELY NOT LINEAR BECAUSE YOU'RE LOOKING AT A MAXIMUM ENERGY IN A FREQUENCY KIND OF THE MOST EXPENSIVE PART IS HERE WITH MATLAB I HAVE THREE FOUR TIMES REAL TIME OKAY UM YOU CAN DO SUB OPTIMAL PROCESSING AND UH FOR EXAMPLE HERE I'M CONSIDERING ALL POSSIBLE PAIRS OF MICROPHONES UH WHICH IS TWENTY EIGHT AND THE PROCESSING IS DIRECTLY UM R PROPORTIONAL TO THAT SO UM YOU CAN SAVE ON THAT BUT THEN YOU LOSE A LITTLE BIT ON PRECISION ALSO I I'M USING ALL THE SMALL FRAMES WITH FIFTY PERCENT OVERLAP I DON'T THINK YOU REALLY NEED ABSOLUTELY TO DO THAT AND EVEN IF YOU USE UH FOUR MICROPHONES TO GET UH NOT GOOD OKAY UM YEAH I WOULD BE CAREFUL WITH THAT LIKE FIVE SIX IS UH DECENT UH SIX I WOULD SAY YEAH AND EIGHT IS UH IS GOOD EIGHT YEAH UH I GET DOWN NOW TO ONE TWO DEGREES UH ROOT MEAN SQUARE ERROR UH SO YOU MIGHT NOT NEED THAT THAT'S WHAT I MEAN MIGHT NOT BE YES ONE TWO DEGREE IS VERY VERY SMALL FOR UH FOR OUR APPLICATION BECAUSE WE WANT WE REALLY WANT TO DETECT UH IF TH THIS IS THE SAME PERSON THAT IS SPEAKING OR NOT IF THERE IS UH AN ERROR OF UH LET'S SAY UH TEN FIFTEEN DEGREES AND BUT UH IT IS UM CAPABLE OF UH SEEING IT AS TWO DIFFERENT PERSON THERE IS NOT PROBLEMS WITH THE YEAH SO IT COULD BE SUFFICIENT TO UH YEAH DEFINE ENOUGH SECTORS AND OKAY AND THE NUMBER OF SECTORS IS UH IS NOT DEPENDENT OF UH THE NUMBER OF MICROPHONES SO IT'S ARBITRARY I USE TWENTY DEGREE SECTORS UH 'CAUSE I HAD TO CHOOSE A VALUE BUT IT'S UP TO YOU UM WELL OTHERWISE IT COULD ALSO JUST RELY ON THE FREQUENCY BAND SEPARATION AND DETECT THAT WAY THE DIFFERENT PERSONS AND TH THEN YOU DON'T REALLY KNOW WHERE AROUND THE TABLE THESE BUT UH IF THERE IS UH TWO TWO PERSON THE SAME SECTOR I SEE WELL D DEPENDS WITH HOW YOU DO IT BUT IF IF YOU PLACE THE THE MICROPHONES UH N YEAH UH UM YEAH I THINK IT'S NOT NECESSARILY A BAD IDEA ACTUALLY UM BUT UH WELL UH IF YOU ARE ABLE TO CALIBRATE YOUR MICROPHONES UM THE ONES WHO ARE CLOSER TO THE PERSON WILL GET MORE ENERGY MM-HMM UM SO YOU CAN COMPARE THAT IT'S POSSIBLE SO IF YOU ARE YEAH UM I HAVE EXPERIENCE WITH THAT UM ON THE SIDE I'VE DONE SOME SINGLE CHANNEL WORK WHICH CAN MAYBE HELP UM 'CAUSE UH IT SEEMS TO ME THAT YOU ARE NOT DEFINITE ON THE GEOMETRY RIGHT GEOMETRY IS NOT WE HAVE NOT UH THOUGHT A LOT ABOUT IT UM M THIS PART IS QUITE SPECIFIC TO A MICROPHONE ARRAY WHERE LIKE THEY ARE CONCENTRATED IN UH SOME PLACE LIKE IN THE MIDDLE OF THE TABLE YES BECAUSE IF WE ARE DISTRIBUTING THE MICROPHONE ALL AROUND THE TABLE THEN WE COME BACK TO THE ENERGY SOLUTION IS IT WHAT YOU SAY BUT YOU CAN KIND OF COME BACK TO THAT ALSO UM UH F. F. T. ALSO YEAH YEAH BUT TH UH UH I THINK WHAT IS VERY IMPORTANT HERE IS THE SYNCHRONIZATION OF THE MICROPHONES RIGHT IT HAS TO BE AS GOOD AS POSSIBLE YEAH TO HAVE NOT UH VERY EXPENSIVE TABLES SO I DON'T KNOW IF UM UH WHAT I'VE SEEN W ON OUR WEBSITE WAS UH THAT THE THIS INSTALLATION WAS UH A BIT EXPENSIVE UH BUT I'M TRYING TO UH TO TO TO SEE WHAT IS VERY IMPORTANT AND UH WHAT IS NOT UH FOR YES YOU KNOW NO UM SO YOU CAN UH THEIR PATTERN IS UH NOT UH THE SAME UH DEPENDING ON THE DIRECTION WHERE THE PERSON IS SO FOR EXAMPLE IF THERE WAS A DIRECTIONAL MICROPHONE POINTING THERE YOU WOULD GET MOST OF MY ENERGY BUT LESS FROM YOU ET CETERA YOU CAN ALSO DO MICROPHONE ARRAYS WITH DIRECTIONAL MICROPHONES UH UM MIGHT NOT BE RELEVANT BUT UM WHAT WOULD BE THE DIFFERENCE YOU WILL NOT COMPARE EACH MIC WITH UH ALL THE OTHER ONE BUT JUST COMPARING THIS ONE WITH THE MORE OR LESS IT'S IT DEPENDS ON WHAT YOU WANT I MEAN UH I DON'T KNOW YEAH SO WHAT ARE THIS MIC FOR INSTANCE THE ELECTRET MIC OMNI DIRECTIONAL ELECTRET M UH I GUESS SO IT'S THE SAME YEAH YES OKAY EXPENSIVE YEAH YEAH QUITE EXPENSIVE YEAH THEY ARE UM HIGH QUALITY MICS AND THEY ARE PLUG IN THE ON THE X. L. R. OR UH UH I THINK WE CAN LEAVE THIS QUESTION FOR OLIVIER OKAY FOR THE OUR WE'LL WE WE'LL UH YEAH NO NO Y YOU WOULD UH ASSUME UH YOU WOULD NEGLECT IT THE TIME DELAY IS IS VERY SMALL IT IT'S ONLY USED FOR UH GETTING THE A DIRECTION WHEN YOU HAVE A MICROPHONE ARRAY BUT IN THAT CASE IT'S NOT RELEVANT UM YOU WOULD ASSUME THAT THEY ARE ROUGHLY SYNCHRONISED NOT NECESSARILY VERY PRECISELY AND UM COMPARE THE ENERGY LEVELS BUT I HAVE NO EXPERIENCE WITH THAT OKAY OKAY YEAH UM NOW I DON'T KNOW YOU DON'T WANT TO USE AH IT'S ALMOST OKAY LET'S HAVE A BREAK YES COOL