UH WE ARE NOT INTERESTED SO MUCH IN SOUND LEVEL BUT UH IN THE LEVEL OF UH THE SOUND THAT CORRESPONDS TO VOICE HMM BUT I THINK UH THIS IS TWO DIFFERENT PROBLEMS UH THE FILTERING MUST BE MUST BE DONE BEFORE MM MM OKAY IT WAS JUST A HMM OKAY GO ON AND UH THE SECOND QUESTION WAS ABOUT UM UH FILTERING AND UH F. F. T. YEAH WHAT YOU CAN GET FROM IT UH OKAY AND I WOULD ADD UH ONE MORE IT'S ABOUT UM BECAUSE WHAT WE CAN UH RECORD IS UH SOUND UH ORIGINS SO IN PO UH SO NO SONIC POINTS BUT WHAT WE ARE INTERESTED IN IS PEOPLE SO THE QUESTION IS IF SOMEONE IS MOVING I'M TALKING HERE I STOP TALKING I'M GOING HERE I'M TALKING HOW TO DETECT THAT IT'S THE SAME PEOPLE IF WE WANT TO UH INTEGRATE INFORMATION TO SAY THESE PEOPLE HAS UH SPOKEN SEVENTY PERCENT OF THE TIME IN THE FIVE LAST MINUTES OBVIOUSLY WE NEED TO UH TO KNOW THAT IT'S THE SAME PEOPLE SO RIGHT NOW OUR PRACTICAL SOLUTION IS TO HAVE ONE UH MICROPHONE CLOSE TO UM EVERY PLACE WHERE PEOPLE ARE SUPPOSED TO SIT SO WE CAN INFER THAT IF A SOUND IS COMING IN THIS AREA IT'S THE SAME SO KIND OF TRICK BUT FOR THE BEGINNING IT'S ENOUGH UM IS THERE A WAY TO UH TO FROM ONE UH FROM ONE STREAM TO UH TO BUILD TWO STREAMS THAT CORRESPOND TO THE THE VOICE OF ONE PEOPLE AND THE VOICE OF THE SECOND THE SEPARATION UH YES AND IS POSSIBLE TO DO THIS IN REAL TIME YEAH THAT'S UH AND A LAST QUESTION THAT IS RELATED T UH OUR LAST IF I NOT FIND ANOTHER ONE UM ABOUT PEOPLE IF SOMEONE IS LEAVING OR IF SOMEONE UH MAYBE IT WOULD BE SOMETHING EV UH QUITE COMPLEX EVEN FOR YOU IF SOMEONE IS STAYING HERE BUT IS QUIET OR LEAVING HOW CAN WE DETECT THAT SOMEONE IS HERE BUT QUIET OKAY WELL YOU NEED A CAMERA OBVIOUSLY I MEAN WILL YOU HAVE A CAMERA NO AND IT IT THIS IS NOT UH OH THE WAIT AND THE SIT YEAH YEAH THAT YOU COULD DO OR ON THE TABLE UH THERE SHOULD BE WELL YEAH BUT WHAT HAPPENS IF O SOMEONE IS STANDING THEN OR PUTTING HIS BAG ON THE OKAY BUT IT WAS JUST TO IT'S A QUESTION I'M NOT SURE WE WILL TALK TOO MUCH ABOUT THAT TODAY SOUND RELATED QUESTION OKAY UH NOT DIRECTLY BUT IT'S UH RELATED MM WELL OKAY SO WE WILL WE HAVE CHOSEN ONE THAT HAS EIGHT UH LINE UP SO WE'LL BE ABLE TO HAVE LINE IN SORRY SO WE WILL BE ABLE TO PLUG UH UP TO EIGHT UH MICROPHONES WITH UH JACK PLUGS TO EXHALE AIR WITH THE POSSIBILITY OF EXTENDING WITH EIGHT MORE X. L. R. UH MICROPHONE WITH ANOTHER BOX OR THE THE COMMUNICATION BETWEEN THE THE EXTENSION AND IS UH OF THE NO NO NO IN FACT UH THAT'S UH IT'S ANOTHER THING THIS OPTIC WELL UH M WE HAVE AND THE FIRE WIRE PORT AND THERE IS AN EXTENSION FOR THIS THIS UH THIS DEVICE CONNECTED TO IT UH WITH UH OPTIC FIBRE TO HAVE EIGHT MORE X. L. R. IF WE NEED IT BUT WE ARE NOT SURE TO TO BUY IT NOW BUT WE CAN EXTEND IT ACTUALLY IT'S NOT REALLY AN EXTENSION TO THE FIRST BOX JUST AN INDU INDUSTRY STANDARD UH UH PROTOCOL BETWEEN THESE TWO UH IT'S ANOTHER FIRE WIRE OR NOT FIRE WIRE BUT UM OKAY BUT CONCRETELY YOU WOULD USE THAT TO GET HIGHER QUALITY SIGNALS YES UH YES YEAH AH OKAY OKAY SO WE WANTED TO HAVE OPEN POSSIBILITIES AND SECONDLY MAYBE WE WILL USE THIS BOX YOU KNOW TO GET UH DATA I DON'T KNOW IF IN ANOTHER EXPERIMENT MAYBE IN ANOTHER PROJECT IF WE WANT TO HAVE COMMENTS OF DIFFERENT PEOPLE AROUND THE TABLE OR O ELSEWHERE UH GETTING UH HAVING THE POSSIBILITY OF USING X. L. R. MICROPHONE COULD BE UH UH COULD BE NEAT SO EVERYTHING IS OPEN SO UH JUST UH SOMETHING VERY VERY REL I COULD UH EVEN UH GO TO LOWER BUT UH THIS IS JUST TO GET THE THE S THE NOISE THE SOUND LEVEL BUT UH IF I WANT TO RECORD THE CONVERSATION WITH UH UH A PROCESSING AFTER TH YES TO TO HAVE A BETTER SOUND QUALITY UH PERHAPS IT'S BETTER TO HAVE A X. ARRAY YEAH SOMETHING LIKE THAT UH WE USE SIXTEEN SO THAT'S EIGHT KILO BAND WIDTH SIXTEEN KILO UH SAMPLING FREQUENCY IT IT'S NOT BAD UH IT'S QUITE DECENT UM MM F BEFORE ANSWERING THE QUESTIONS UH TH THERE'S ALSO A POINT OF UH PRECISION OF LOCALIZATION IF YOU USE AN ARRAY SO IF YOU USE HIGHER FREQUENCIES YOU CAN GET MORE PRECISE LOCALIZATION BUT MAYBE YOU DON'T NEED IT BUT UH WHAT IS THE THE GAIN IN TERMS OF UH POSITION UH THAT I CAN'T ANSWER DIRECTLY UH UH UH CENTIMETRES OR UH MORE UH IT DEPENDS ON YOUR SET UP YOU KNOW UM YOU HAVE TO TEST BASICALLY M UH WHAT YOU GET IS UH THE REAL POSITION OR UH JUST UH THE ANGLE AT WHICH THE THE SOUND COMES UM Y YOU GET UH THE ANGLE THE MOST PRECISE ONE IS THE ASYMMET IN THE HORIZONTAL PLANE THEN YOU ALSO GET ELEVATION BUT IT'S NOT VERY PRECISE IT'S MORE OF AN INDICATION AND RADIUS IS VERY BAD OKAY IF YOU USE A PLANAR GEOMETRY LIKE THIS ONE YES SURE YEAH UM YOU CAN USE MULTIPLE ONES AND DO SOME UM UM TRIANGULATION HMM UH BECAUSE UH THERE THERE IS JUST UM FOUR MICROPHONES THAT ARE EIGHT THESE ARE ONLY SCREWS MICROPHONES ARE ON BOTTOM YEAH YEAH OKAY BECAUSE UH AT AT T. P. F. N. THERE IS A LAB THAT IS UH HAS DONE ALMOST THE SAME THING BUT THEY HAVE UH EIGHT MICROPHONE THAT ARE UH AT UH YES THE EIGHT UM THE EIGHT UH UH COR CORNER OF UH A CUBE YES YEAH THEN YOU MIGHT GET UH BETTER DIRECTION IN ELEVATION BUT I'M NOT SURE IT'S REALLY RELEVANT UM NO SO UH IF PEOPLE MOVE FORWARD YEAH AH THE RADIUS TH THEN THE R THE PROBLEM IS NOT THE GEOMETRY IT'S THE UM I YOU NEED MORE THAN ONE BASICALLY YES OKAY WITH ONE YOU WILL ONLY GET DIRECTION MORE THAN ONE YES BECAUSE UM BECAUSE I THE UM THE DISTANCE BETWEEN THE THE MICROPHONE IS TOO UH IS TOO LOW TO DIRECTION YEAH UM WOULD IT ALSO WORK IF YOU PLACED UH THE MICROPHONES AT AT THE BORDER OF THE TABLE YOU SEE NOW YOU YOU HAVE IT QUITE CENTRAL AND UH WHAT HAPPENS IF IF YOU PUT THEM HERE ON AROUND THE TABLE WOULD IT WORK AS WELL OR IT'S A DIFFERENT OPTION YEAH UM WE HAVEN'T TRIED THAT BECAUSE WE ARE NOT GOING TO HAVE THE SPECIAL KIND OF TABLE MORE UH THIS IS NOT A GOOD EXAMPLE BUT WE HAVE LIKE A BOX JUST BRING THE BOX AND PUT IT SO IT UH WE COULD NOT CONSIDER THAT