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A speech message store and readout system using a delta modulation technique / Meliani, Hamza 

Public ISBD Titre : A speech message store and readout system using a delta modulation technique Type de document : texte imprimé Auteurs : Meliani, Hamza, Auteur ; J. P. Newsome, Directeur de thèse Editeur : Nottingham : University of Nottingham Année de publication : 1983 Importance : 123 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Master : Electronique : Nottingham, University of Nottingham : 1983 Annexe f. 124 - 147 . Bibliogr. f. 148 - 149 Langues : Anglais (eng) Mots-clés : Digital  speech  message  processor Delta  modulation  technique Analogue  voice  signals Zero  digital  data C.V.S.D.  method Harris  HC-55532  integrated  circuit Index. décimale : Ms00683 Résumé : The aim of this project was to design and implement a digital speech message processor and store, using a delta modulation technique. The work mainly consisted of two parts. The first part was to design a system capable of converting analogue voice signals into serial Non-Return to Zero digital data, and of reconverting that data into voice. The conversion was made by using a delta modulation technique, which employed the continuously variable slope (C.V.S.D.) method of companding. The system was built around the Harris HC-55532 integrated circuit which is capable of half-duplex operation switching between the encode and decode functions. An emphasis was made to determine the optimum operating conditions of the system in order to ensure the best possible speech intelligibility. The second part of the project dealt with the design and implementation of a temporary memory store in which a digitised speech signal can be stored and played back whenever it is desired. An EPROM programmer was implemented in the memory store, allowing a permanent store of the digitised speech signals in EPROMS (erasable programmable read only memory). The memory store was built around the Z-80 central processor unit (C.P.U.). In the final stage, a play back unit was designed as an illustration of a possible practical application of the speech message store. A speech message store and readout system using a delta modulation technique [texte imprimé] / Meliani, Hamza, Auteur ; J. P. Newsome, Directeur de thèse . - Nottingham : University of Nottingham, 1983 . - 123 f. : ill. ; 30 cm. Mémoire de Master : Electronique : Nottingham, University of Nottingham : 1983 Annexe f. 124 - 147 . Bibliogr. f. 148 - 149 Langues : Anglais (eng) Mots-clés : Digital  speech  message  processor Delta  modulation  technique Analogue  voice  signals Zero  digital  data C.V.S.D.  method Harris  HC-55532  integrated  circuit Index. décimale : Ms00683 Résumé : The aim of this project was to design and implement a digital speech message processor and store, using a delta modulation technique. The work mainly consisted of two parts. The first part was to design a system capable of converting analogue voice signals into serial Non-Return to Zero digital data, and of reconverting that data into voice. The conversion was made by using a delta modulation technique, which employed the continuously variable slope (C.V.S.D.) method of companding. The system was built around the Harris HC-55532 integrated circuit which is capable of half-duplex operation switching between the encode and decode functions. An emphasis was made to determine the optimum operating conditions of the system in order to ensure the best possible speech intelligibility. The second part of the project dealt with the design and implementation of a temporary memory store in which a digitised speech signal can be stored and played back whenever it is desired. An EPROM programmer was implemented in the memory store, allowing a permanent store of the digitised speech signals in EPROMS (erasable programmable read only memory). The memory store was built around the Z-80 central processor unit (C.P.U.). In the final stage, a play back unit was designed as an illustration of a possible practical application of the speech message store.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00683	Ms00683	Papier	Bibliothèque centrale	Mémoire de Master	Disponible

Documents numériques

MELIANI.Hamza.pdf URL