SO OF COURSE THERE THERE MIGHT BE UH SOME UH DISTURB UH DISTURBED UH WHEN YOU CONCATENATE THOSE SEGMENTS TOGETHER BUT THEN THE PHASE MIGHT BE IMPORTANT BUT OTHERWISE I MEAN I DIDN'T FIND ANY ANYTHING IMPORTANT WITH THE PHASE LIKE GREAT KEEP THE PHASE ZERO AND IT WORKS OR AND NOW I MEAN THERE IS THERE ARE UM MM THERE IS RESEARCH UH UM PU THAT'S BEEN PUBLISHED SHOWING YOU KNOW SPEECH RECONSTRUCTION FROM THE ESSENTIALLY THE SPECTROGRAM WITHOUT PHASE INFORMATION YEAH SO YES BUT THIS IS IN TIME DOMAIN MORE OR LESS RIGHT THE SPECTROGRAM YOU MEAN YEAH YEAH YEAH YEAH LIKE IF Y YOU BE EXACTLY THE SAME AS SINUSOIDAL CODING OR SOMETHING LIKE THAT ALL YOU NEED IS THE RECONSTRUCTION OF THE SPECTROGRAM IN ORDER TO ESTIMATE THE HARMONIC AMPLITUDES AND WHAT WE CAN ALSO DO VERY SIMPLE IS JUST TO GET THE MAGNITUDE SPECTROGRAM USING THIS APPROXIMATION WITHOUT THE CARRIER JUST HILBERT ENVELOPE BUT YOU JUST UH GET IT IN IN THIS WAY IN IN THE WAY OF ROB'S RIGHT BUT YOU CAN ALSO GET THE S SHORT TIME FOURIER TRANSFORM UH AND KEEP IT RIGHT JUST CLASSICAL UH FRAME BY FRAME ALGORITHM TWENTY MILLISECONDS UH BUT YOU KEEP JUST THE PHASES INSTEAD OF MAGNITUDES AND YOU CAN PUT THIS TOGETHER RIGHT AND IT WORKS PRETTY WELL AND THEN THE SIGNAL IS NOT UH JUST UH WHISPERED THEN YOU REALLY HEAR THAT THERE IS THE VOICENESS IN THE SIGNAL BUT UH OF COURSE THE QUALITY IS UH IS NOT SO GOOD STILL BUT UH YOU CAN USE IT FOR LIKE TWO THREE KILO BITS PER SECOND AND IT WORKS YEAH BUT THAT'S THAT'S THE BIG THING AT THE MOMENT ISN'T IT IF IF YOU'RE MM IF I IF THE IF THE EXCI IF THE IF THE ENCODING RATE'S TWO KILO BITS PER SECOND FOR THE THE EXCITATION COMPONENT OF THE SIGNAL IT DOESN'T MATTER HOW EFFICIENT YOUR UM ENCODING OF THE SPECTROGRAM IS YOU'RE ALWAYS GONNA HAVE A HIGH RELATIVELY HIGH BIT RATE YEAH SURE YEAH ANYWAY SO UM HMM M MAYBE IT WOULD BE NICE IF YOU T IF YOU TELL US UH WHAT YOU DO WITH THE SPEECH CODING 'CAUSE I D I DIDN'T SEE ANY OF P. H. D. S OF YOU I THINK SO IF YOU DID SOMETHING SO MAYBE IT WOULD BE INTERESTING AT LEAST TO YEAH YEAH SURE UM IN STANDARDS AND YEAH BUT THEY'RE THEY USED TO IMPLEMENT ALL THESE CODERS G. S. M. AND I. T. U. STANDARDS SO YOU WERE WHEN WHEN DID YOU DO THAT NO JUST BEFORE MY P. H. D. FOR LIKE FEW MONTHS YEAH BUT THAT'S UH LIKE INDUSTRY IT'S REALLY A BIG DEAL LIKE SO THEY THEY THEY WORK ON A LOT OF THESE STANDARDS YEAH BUT MOSTLY THEY'RE ALL BASED ON CELP LIKE MAINLY YEAH SO IS IT NOKIA'S BEING SUED IN THE U. S. FOR THEIR TRI BAND USAGE 'CAUSE YOU KNOW INTELLECTUAL PROPERTY UH NO NO G G. S. M. BECAUSE THEY DON'T HAVE G. S. M. IN THE U. S. OR I DIDN'T HAVE G. S. M. IN THE U. S. RIGHT IT'S UH KIND OF S NO C. D. M. A. IS UH ANOTHER LEVEL I THINK NO NO N UH WELL THAT'S TRI BAND S YEAH YEAH YEAH YEAH YEAH YEAH YEP AND APPARENTLY NOKIA'S IN A BIT OF TROUBLE OVER THAT ONE BUT YEAH WELL IT'S INTERESTING NOW IT'S REALLY BIG COMPETITION YEAH SHOULD'VE BEEN A LAWYER WELL THAT'S BUT I MEAN CODING IS A MUCH MORE SORT OF IT'S IT'S IT WELL I MEAN IT'S IT'S UH IT WHEN IT BOILS DOWN TO JUST MATHEMATICS TO A LARGE EXTENT DOESN'T IT IT'S IT'S JUST UH SORT OF IT'S YOU KNOW COMMUNICATIONS S SORT OF NO SO WHERE DO YOU THINK YOUR THING IS USEFUL IN C. D. M. A. OR G. S. M. I THINK MAYBE IN C. D. M. A. IT MAY BE M C. D. M. A. IS MORE LIKE MORE TIME DOMAIN THE THEY THEY ARE C DOING ONLY WELL THE PROBLEM IS THIS IN WITH THIS APPLICATION OR IT DOESN'T HAVE TO BE PROBLEM BUT ONE CONSTRAINT IS THAT WE ARE PROCESSING ONE SECOND OF THE SIGNAL YOU CAN GO DOWN OF COURSE BUT THEN YOU ARE LOSING LITTLE BIT OF THE BIT RATE LET'S SAY RIGHT SO BUT THERE ARE MANY APPLICATIONS WHERE YOU REALLY CAN USE IT BECAUSE YOU DON'T CARE ABOUT ALGORITHMIC DELAY ONE SECOND ALGORITHMIC DELAY LIKE FOR I DON'T KNOW IF INSTEAD OF S. M. S. YOU CAN REALLY HAVE SOME CHANNEL WHERE YOU JUST RIGHT UM SO PROBABLY RIGHT RIGHT YEAH I DON'T THINK YOU CAN PROBABLY DO MUCH MORE THAN WHAT'S ALREADY BEEN ACHIEVED BECAUSE TO GET HIGHER COMPRESSION YOU HAVE TO YOU KNOW TAKE ADVANTAGE OF REDUNDANCY OVER LONGER TIME SPANS SO BUT YOU KNOW REALLY THE THESE LONG LINE TELEPHONES THEY ALREADY HAVE DELAY NO AT LEAST HALF A SECOND OR YEAH YEAH YEAH YEAH BUT MOBILE M AND THIS ONE IS I DON'T KNOW I MEAN UH YOU'D BE YOU TRIED SINUSOIDAL CODING BASED APPROACHES DIDN'T YOU SINUSOIDAL CODING WELL BUT THE SINUSOIDAL CODING IS USUALLY M WHEN YOU S AT LEAST WHAT I THINK OR UH WHAT I KNOW IS WHEN YOU ARE DOING SINUSOIDAL CODING IT MEANS YOU JUST TAKE THE SPEECH SIGNAL AT THE BEGINNING RIGHT AND YOU ARE TRYING TO FIND TO UH YEAH TO FIND THE HARMONICS IN A TEMPORAL DOMAIN RIGHT FOR THAT BUT I MEAN THE TH THE THE THING IS YOU'D NEED TI IT PART OF THE PARAMETER SET FOR THAT IS UH THE UM UH THE F UH THE HARMONIC AMPLITUDES AND THEN ONE WAY OF COMPRESSING THE HARMONIC AMPLITUDES IS JUST STORING THE SMOOTH SPECTRUM AND THEN YOU CAN UH AND THEN YOU CAN INTERPOLATE YEAH YOU CAN JUST PICK THE THE UM THE HARMONIC AMPLITUDES ON THAT SPECTRUM WHEN YOU RECONSTRUCT ON THAT SMOOTH VERSION OF THE SPECTRUM WHEN YOU RECONSTRUCT Y YEAH WELL I WAS JUST SAYING TRYING TO FIND OUT THE STRONGEST OR THE THE MOST DOMINANT PEAKS IN THE SPECTRUM WHICH IS MORE OR LESS THE SAME LIKE WHAT DAVID WAS DOING LIKE IT'S REALLY UH YEAH YEAH YEAH BUT YOU KNOW THE THE F THE INTERESTING HE WAS USING TWENTY I THINK LIKE YEAH MAYBE YOU CAN TRY TO REDUCE I M H UH HE WAS JUST USING THE FUNDAMENTAL FREQUENCY AND IF YOU SMOOTH IT DOING A SMOOTH SPECTRUM REPRESENTATION OF THE HARMONIC AMPLITUDES THEN YOU ONLY NEED TO STORE THE THE THE FUNDAMENTAL FREQUENCY AND AND THE AND THE MAXIMUM VOICE FREQUENCY AND EVERYTHING ELSE CAN BE YEAH S YEAH SURE SO AND THEN BUT THEN THE TRICKY THE ONLY TRICKY THING THAT WE HADN'T FIGURED OUT WAS THE PHASE INFORMATION EACH AGAIN UM BUT Y BUT UH YOU CAN STILL GET A LIKE YOU GET TH UM BASICALLY IF YOU DO PHASE UNWRAPPING AND ALL OF THESE OTHER TRICKS YOU END UP WITH SOME SORT OF PHASE REPRESENTATION WHICH IS SOME SORT OF MONOTONICALLY DECREASING FUNCTION YEAH UNWRAPPED YEAH