Digital Signal Processing (DSP) for Mobile Communications
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- Marilyn Martin
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1 Speech coding for mobile & VoIP Digial Signal Processing (DSP) for Mobile ommunicaions To reduce he bi-rae required for ransmiing elephone qualiy speech, a new approach o speech compression is needed. urren mobile phones compress o abou 13,000 b/s (bi per second) and we aim o achieve 4,000 b/s and lower using a mehod called 'DAP-ST'. ompression is generally achieved by specrally analysing speech segmens o derive a model of he human speech process. DAP-ST is a new and poenially more accurae way of doing his wih a modified speech producion model. A variable bi-rae version achieves an average 2,400 b/s and is suiable for packeised speech as may be ransmied over compuer neworks. Unvoiced exciaion Filer Filer Gloal filer Lip Radiaion Timereversal Vocal rac Speech Voiced exciaion "Source-filer" model of human speech producion f
2 Paien Monioring DSP is being applied o he monioring of paiens wih chronic cough in a collaboraive projec wih Wyhenshawe Hospial in Mancheser and Fazakerley Hospial in Liverpool. This work emanaes from a clinical sudy of ashmaic, cysic fibrosis and crypogenic fibrosing alveoliis paiens. The requiremen is o obain saisical measuremens from long erm sound recordings o allow objecive assessmen of he severiy of cough. These measuremens are being used for comparing he effeciveness of various reamens and o sudy he physiological characerisic of pulmonary disease. 3 A ypical c oug h waveform Seady-sae phase Final phase -3 Expulsive phase Tim e (sec)
3 Low power implemenaion of DSP The requiremen for exended baery life, reduced size and low elecromagneic inerference for mobile communicaion equipmen has led o he developmen of a novel asynchronous DSP device known as ADRE. ompiler suppor for he new device is needed o avoid manual assembly-level programming. Apar from maximising speed and minimising code size, he compiler is required o produce code which explois he special feaures of ADRE o minimise energy consumpion. This opimisaion a sofware level builds on he economies achieved a hardware design level and aims o minimise he swiching aciviy when he DSP code is implemened. DSP chip Energy Real ime mulimedia faciliies for disance learning over IP neworks Disance learning can be a major applicaion of fixed and mobile compuer neworks and he Inerne. We are concerned wih he inroducion of real ime mulimedia faciliies ino his applicaion. Delay and nework congesion have a more serious effecs on real-ime raffic han on ex and here are ineresing ways of adaping face-o face communicaions, as occur in ypical disance learning scenarios, o he available connecions and heir bandwidhs. An adapive rade-off beween speech, daa and images is possible and 'ad-hoc' poin-o-poin rouing beween paricipans can reduce he effecs of nework congesion. Server On-line uorial wih poin-o-poin rouing
4 Exracion of expressive performance parameers from acousic recordings of music An effecive musical performance involves very fine and suble variaions of iming, dynamics, imbre, ariculaion, vibrao and oher characerisics of he sound. A convenional musical score gives only general direcions wih respec o hese characerisics. Our aim is o be able o auomaically measure he expressive characerisics of a live or recorded musical performance and o develop noaion, using colour and oher markings, for augmening he score wih hese measuremens in a clear and convenien way. This has many applicaions, for example in comparing differen inerpreaions of he same piece, providing feedback during rehearsal and diagnosing problems wih echnique
5 Voice over muli-carrier wireless LANs This work addresses he problem of efficienly inegraing wireless elephony and wireless compuer neworks using a IEEE sandardised 'muli-carrier' physical layer. This allows he sharing of resources, common access o elephone and daa services and he ineracion beween normally separae sysems. Tradiional voice over IP approaches are inefficien in erms of sysem overheads, and more recen proposals, such as "5-UP" are no compaible wih 'ad-hoc' neworks. Our echnique ransmis packeised voice on he muliple carriers individually, one per voice channel, and requires he wireless elephones o conform wih sandard IEEE collision avoidance proocols. Wireless LAN ordless phone Lapop ordless phone PDA AP Lapop PDA LAN connecion
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