{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-D09VHFJ5/c429a0d3-0d58-4e86-8c79-999202649da9/PDF","dcterms:extent":"259 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-D09VHFJ5/5e0e0f71-1b03-4d02-8f34-ecd60494b8d4/TEXT","dcterms:extent":"25 KB"}],"edm:TimeSpan":{"@rdf:about":"1985-2025","edm:begin":{"@xml:lang":"en","#text":"1985"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-D09VHFJ5","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-Z2J12Z6C"},{"@xml:lang":"sl","#text":"Informacije MIDEM"}],"dcterms:issued":"2008","dc:creator":["Beaugeant, Christophe","Miletić, Dejan","Stergar, Janez","Tramblay, Bruno"],"dc:format":[{"@xml:lang":"sl","#text":"številka:2"},{"@xml:lang":"sl","#text":"letnik:38"},{"@xml:lang":"sl","#text":"str. 111-116"}],"dc:identifier":["ISSN:0352-9045","COBISSID:12951318","URN:URN:NBN:SI:doc-D09VHFJ5"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Strokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale"},"dc:subject":[{"@xml:lang":"sl","#text":"avdio signali"},{"@xml:lang":"sl","#text":"filtri"},{"@xml:lang":"sl","#text":"mikrofoni"},{"@xml:lang":"sl","#text":"mobilni telefoni"},{"@xml:lang":"sl","#text":"obdelava signalov"},{"@xml:lang":"sl","#text":"prenosne funkcije"}],"dcterms:temporal":{"@rdf:resource":"1985-2025"},"dc:title":{"@xml:lang":"sl","#text":"Microphone transfer function adaptation using a Bi - Quad filter and DCL| Adaptacija prenosne funkcije mikrofona z Bi - Quad filtrom in DCL|"},"dc:description":[{"@xml:lang":"sl","#text":"A suitable adaptation of the microphone in the audio path of a mobile device is a very sensitive tasks. The conformation of the frequency response characteristic to the GSM standards is inevitable. Achieving the highest correlation between the specified GSM frequency response specification with the microphone and speaker characteristic is a delicate matter. In this paper we will present tests performed for microphone transfer function adaptation on a mobile phone using a Bi-Quad filter. Therefore a cascading with a IIR filter of the 11. order was applied. The main goal of our test was to evaluate the influence of a recursive filter in the audio input path to the recognition rate of the embedded recognizer. The focus of our tests was to simulate the cascaded components with only one substitute having similar (almost equivalent) frequency response characteristics. By doing so we assumed that the microphone used was a high quality microphone with a linear frequency response. Further enhancement of the audio quality was performed by a more sophisticated dynamic compression and limitation algorithm (DCL). For the evaluation tests the Motiv and Aurora 3 databases were applied to the audio input. The tests have shown that with appropriate adaptation of the cascaded components an improvement of the recognition rate is realizable. The recognition rate of the mobile phone embedded recognizer was enhanced for over 6% indicating that the proposed approach sensibly contributes to speech signal enhancement"},{"@xml:lang":"sl","#text":"Ustrezna adaptacija mikrofonske prenosne funkcije avdio poti mobilnega telefona je zelo občutljiva naloga. Skladnost odzivne frekvenčne karakteristike z GSM standardi je obvezna. Doseči kar najvišje sovpadanje med standardiziranim GSM odzivom prenosnega telefona ter dejansko prenosno karakteristiko mikrofona in zvočnika je dokaj težavno. V tem članku bomo predstavili preskuse za adaptacijo mikrofonske prenosne funkcije mobilnega telefona z uporabo rekurzivnega filtra Il. stopnje t.i. Bi Quad filtra. Zato smo v kaskado z vhodno avdio potjo telefona vstavili ustrezen adaptacijski filter. Glavni cilj naših preskusov je bil oceniti vpliv kaskadiranega filtra na uspešnost razpoznavanja vsajenega razpoznavalnika telefona. Pri izvedenkah eksperimentih smo se osredotočili na kaskadiranje zgolj enega samega člena (rekurzivnega filtra) s podobno oz. ekvivalentno frekvenčno odzivno karakteristiko kot veleva GSM standard. Pri tem smo uporabili visokokakovosten mikrofon z linearnim frekvenčnim odzivom. Dodatno izboljšanje kakovosti avdia je bilo izvedeno z naprednejšim algoritmom dinamičnega zgoščanja in omejevanja (DCL). Za evalvacijo razpoznavanja vsajenega razpoznavalnika smo uporabili Motiv in Aurora govorni bazi z omejenim naborom ukaznih besed. Preskusi so pokazali, da lahko z ustrezno adaptacijo prenosne funkcije mikrofona izboljšamo uspešnost razpoznavanja. Z izboljšanjem govornega signala smo povečali uspešnost razpoznavanja vsajenega razpoznavalnika za 6%"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-D09VHFJ5","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-D09VHFJ5"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-D09VHFJ5/c429a0d3-0d58-4e86-8c79-999202649da9/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Strokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-D09VHFJ5/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-D09VHFJ5"}}}}