THE COMPRESSION NUMBER OF BANDS AND LENGTHS OF THE SO WHAT YOU WHAT YOU WERE PLAYING WITH AND WHAT OTHER RESULT LIKE WHAT TO USE SO THAT IT SOUNDS THE BEST YEAH O OF COURSE YOU YOU LISTEN TO IT YOURSELF I D I'M FINE WITH THAT BECAUSE WHICH SEEMS TO ME FIT FIFTEEN FREQUENCY BAND WHICH SEEMS TO ME QUITE REASONABLE WE CAN GO DOWN TILL LIKE TWELVE AND STILL OKAY I WOULD SAY BUT THEN YOU START HEARING DIFFERENCE OR ALSO THAT'S ANOTHER PROBLEM ONCE YOU CAN GO DOWN WITH FREQUENCY BANDS THEN YOU WILL HAVE MUCH UH MORE C UH COMPLICATED DATA UH LET'S SAY EXCITATION SIGNAL OR THAT CARRIER WHICH YEAH BECAUSE BROAD BANDS RIGHT YEAH MAYBE LIKE THAT NO SO THERE IS MORE AND MORE S UH FREQUENCY COMPONENTS LET'S SAY OR SOMETHING LIKE THAT IN ONE BROAD BAND SO NO L. P. C. WILL MAYBE BUT THEN YOU HAVE STILL ANOTHER PART SOMETIME SOMETHING LIKE A SOURCE AND A FILTER SO WHEN YOU ARE DOING SPEECH CODING OR YEAH USE MAYBE YOU CAN USE THE BOARD FOR THAT YEAH WILL BE HERO WHY CAN WE REMOVE THIS WHEN YOU ARE GOING TO THIS PLACE I DON'T THINK SO I THINK NO WE ARE WIRED SO YOU'VE GOT SOURCE SIGNAL I DON'T KNOW SOURCE I THINK YOU HAVE TO PUSH IT PUSH IT AS MUCH AS POSSIBLE BECAUSE IT REACTS TO THE AND THAT'S AND THAT'S IT AND THE SOURCE CAN BE A NOISE SIGNAL OR IT CAN BE SOME UH SEQUENCE OF UH WHAT IS THAT PULSES RIGHT THIS IS L. P. THIS IS A STANDARD TIME DOMAIN L. P. RIGHT YEAH SO AND IT'S MORE LESS OR LESS THE SAME WHAT I'M DOING SO THIS IS SOME ENVELOPE WHICH IS IN OUR CASE RELATED TO HILBERT ENVELOPE AND THIS IS A SOURCE SIGNAL WHICH IS HILBERT CARRIER BUT THIS IS UH BUT BUT YOU ARE YOU ARE REALLY IN A FREQUENCY DOMAIN SO IT UH THE LINE'S TURNING TO INTO SINES RIGHT AND YOU P AND SINCE THIS THIS I MEAN BECAUSE THIS THI THIS THIS SPECTRUM IS AL HAS ALSO LINE SPECTRUM RIGHT I MEAN ALL COMPONENTS SO IF YOU ARE THEN IF WE ARE IN A FREQUENCY TH YOUR SOURCE LOOKS LIKE THIS AND SO WHAT WE CAN SEE IS SOME HILBERT ENVELOPE LIKE THIS AND THEN THERE IS THAT HILBERT CARRIER OR THIS NOT HILBERT CARRIER BUT THIS IS THE SIGNAL WHICH WE GET FROM ONE DI ONE FREQUENCY BAND SO YOU COMPUTE D. C. T. RIGHT FROM SIGNAL YEAH YEAH EXACTLY AND WHAT WE GET FROM THAT IS THIS HILBERT ENVELOPE RIGHT AND THE SECOND WHICH SHOULD BE THAT CARRIER SHOULD BE SOMETHING LIKE THIS IT'S JUST REALLY CLOSE TO COSINE WE M WE MIGHT SEE IF WE DO IT DO IT PROPERLY RIGHT AND THIS IS WHAT YOU ALSO HAVE TO SOMEHOW TRANSMIT OR AT LEAST TRY TO TRANSMIT IN ORDER TO GET I WAS THINKING THE RESIDUAL IN L. P. C. FIT OF THE HILBERT ENVELOPE NOT THIS I WAS NOT THINKING OF THIS AT ALL BEFORE YOU KNOW 'CAUSE THERE ARE THREE THINGS FIRST YOU HAVE TO ENCODE THIS THEN THE L. P. C. COEFFICIENTS AND THE RESIDUAL AFTER L. P. C. FIT IF YOU LIKE NO NO THIS IS A RESIDUAL FOR ME THIS IS THE RESIDUAL YEAH I'M JUST WAN I JUST WANT TO TRANSMIT THIS SIGNAL RIGHT IT'S AND WHAT YOU NEED IS THIS ENVELOPE AND THIS ONE CARRIER AND YOU AGAIN GET THE SAME SIGNAL THIS THIS THIS SHAPE DOING I. D. C. T. PUTTING EVERYTHING TOGETHER YEAH RIGHT RIGHT BUT IF YOU TAKE A LOOK FOR EXAMPLE FOR A S IF YOU HAVE A VERY G GOOD MUSIC SIGNAL WHICH IS VERY UH PERIODIC YOU CAN REALLY SEE SOMETHING LIKE THERE IS ONE PEAK AND AND FREQUENCY MORE OR LESS DOESN'T CHANGE IT'S UH RELATED TO UH THAT FREQUENCY OF THE BROAD BAND OR HOW IT'S CALLED IF YOU ADD THOSE FILTERS WHICH ARE UH WIDER AND WIDER THIS IS THAT CENTRE FREQUENCY WHICH IS SOMEHOW RELATED TO THIS ONE SO THEN YOU CAN TRANSMIT UH JUST FE L LEFT LEFT BUT BUT F F FORTUNATELY BECAUSE OF HE UH BECAUSE OF PROPERTIES OF HEARING MORE OR LESS FOR THE HIGHER BANDS YOU IF YOU PUT IN JUST S SOME GARBAGE SOME NOISE IT DOESN'T REALLY M W MATTER ALL THAT MUCH IT W SOUNDS LITTLE BIT WORSE BUT UH IT'S NOT A BIG TRAGEDY UH WHERE YOU REALLY W IF YOU WANT TO G DO A GOOD VOICE SPEECH UH YOU'LL WANT TO GET THE LOWER BANDS CORRECT AND IF YOU PUT IN UH NOISE ALTOGETHER IT SOUNDS LIKE A WHISPERED SPEECH UH BUT YOU UNDERSTAND PERFECT BY NOISE IT'S BETTER I WOULD SAY UH BETTER QUALITY DEFINITELY BETTER QUALITY IT LOWER BIT RATE BUT THAT'S A PROBLEM SO SO BECAUSE I MEAN GAVE ALL THE SECRETS AWAY I MEAN QUAL COMPUTERS IS GOING TO OBJECTIVE MEASURE WELL IT WAS SOME THOSE UH DISTANCES SPECTRAL DISTANCES WELL EDINBURGH SAW PROBABLY SO WELL I MEAN UH-HUH UH HOPEFULLY IT BY THEN IT WILL BE PROTECTED AND AND EVERYTHING RIGHT IT'S IT'S UH IT'S BUT LISTEN THIS IS A SCIENCE I MEAN IT'S UH CONFIDENTIAL TO THE EXTENT THAT WE ARE NOT UH I UH PUBLISHING IT YET BUT WE W WE OF OF COURSE WE WILL AND UH AND UH BUT UH WE HAVE TO MAKE SURE THAT THAT UH IF QUALCOMM HAS A INTEREST OF WHO'S FUNDING THE WORK THE THEY HAVE TO HAVE A CHANCE TO UH TO TO PATENT IT OR SOMETHING BUT THAT'S ABOUT ALL THIS IS NOT A PUBLIC UH PUBLIC UH PRESENTATION SO THIS I IS NOT EVEN A PROBLEM THE ONLY PROBLEM WOULD BE IF BUT YOU KNOW NOBODY CAN BEAT P PETR UH PETR MOTLICEK ANYMORE IN I MEAN IF EVEN IF IF NOKIA KNOWS EVERYTHING IF YOU IF YOU SELL IT TOMORROW WHO DID YOU WORK FOR TH THE UH UH TEXT NO T H. P. H. P. THEY WILL TAKE HALF A YEAR BEFORE THEY WOULD EVEN REALISE WHAT IT IS AND BY THEN SO IT'S NOT NO PROBLEM OKAY SO THAT'S WHERE THAT'S UH THAT'S UH RIGHT YEAH YEAH YEAH ALSO THERE ARE PAPERS ABOUT IT THAT F IF YOU HAVE LIKE TWELVE FREQUENCY BANDS IT'S SOMEHOW OPTIMAL SO THIS AND THEN THERE IS A COMPRESSION WHAT ABOUT THAT TO GET THE UH YEAH YEAH YOU CAN MODEL IT BETTER THERE IS NO ECHO OR SOMETHING LIKE REVE REVERBERANCE IN THE SIGNAL IF YOU REALLY GO DOWN WITH THAT COMPRESSION FACTOR TO LIKE ZERO POINT ONE SOMETHING THAT ZERO POINT ONE 'KAY SO WHAT IS THE COMPRESSION FACTOR WE ARE GETTING HERE WHEN YOU COMP UH W WHAT YOU COM WHEN YOU COMPRESS THE EFFECTIVELY THEY'LL WANT THE SIGNAL WHICH WE ARE MODELLING AND UH SO THEN YOU GET THE FITTING TO COMPRESS SIGNAL ESSENTIALLY IF YOU WERE IN SPECTRAL DOMAIN YOU WOULD COMPRESS THE POWER SPECTRUM HERE YOU COMPRESS THE THE TH THIS TH THIS I THE WHAT FUL YEAH OF D. C. T. OF OF THE SIGNAL RIGHT