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1、天津大學(xué)碩士學(xué)位論文數(shù)字助聽(tīng)器的漢語(yǔ)聲調(diào)強(qiáng)化的研究姓名：吳開(kāi)杰申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：生物醫(yī)學(xué)工程與科學(xué)儀器指導(dǎo)教師：李剛2001.1.1AbstractChinaislikelytofacetheseriousissueofpopulationagingwhensheentersthe21stcentury.Populationagingwillbringaboutaserialofsocialproblemitishighlyurg

2、enttoimproveanddeveloptheprojectofmedicalcareforseniorcitizen.Presbycusisisoneofpotentialthreatentoseniorcitizensnormalliving.Hearingaidisthebestsolutionpresentlyknowntogetridofthehearingimpairedsaffliction.Neverthelesst

3、heprogressofdomestichearingaidsresearchseriouslylagbehindthedevelopmentofagedsocietyagreatofadvancedtechnologyandequipmentmustdependondevelopedcountries.Inordertodevelopdigitalhearingaids(HDA)whichcanperfectlyfittheheari

4、ngofChineseassoonaspossibleapreliminarystudywasmadeontheChinesespeechsembellishandenhancementincombinationwithphoneticslinguisticsandothersubjectsknowledge.TheaimofourresearchistostudyhowtoenhanceMandarinTonewhichcanimme

5、nselyimprovethehearingsensitivityofpeoplewhospeakMandarinbasedonhearingcharacteristicofChinese.Intheprocessofresearchmanymethodssuchasspeechvelocitymodulationfrequencybandtransformationtoneenhancementandsoonareadoptedtoe

6、nhancethespeechintelligibility.TheChinesespeechenhancementalgorithmisexploredandverifiedbymanywelldesignedhearingtestswhichprovidemuchusefuldataandparameterforrealizingthedigitalhearingaidscapableoffrequencyconversionand

7、toneenhancement.ManygroupsofMandarinspeechsoundwiththesamesyllablebutdiferenttoneswereselectedinthetest.Theonlymissionofthehearingimpairedistochoosethetonesofthesesyllables.Theresultsshowthatthehearingimpairedismoresensi

8、tivetoMandarinTonethanothermessageundertheconditionthattheycantrecognizethephonemeorthemeaningofsyllableswell.SowecanconcludethatMandarinToneisaimportantcuetothehearingimpaired.Duetotheknowledgeofspeechanalysisthetonesub

9、stantiallyisthepitchschangingtrend.Afterthecomparisonofdiferentkindsofspeechanalysisandsynthesizesystemthesinusoidaltransformationsystemwhichcaneasilycontrolandmodifythespeechparametersuchaspitchphaseetc.isselectedastheb

10、aseofalgorithmoftoneenhancement.Thissystemcanalsoeasilyextenttotimescalemodificationandpitchscalemodification.IntheresearchwenoticethatsomepitchmodifiedspeechcanenhancetheMandarintoneandhelpthehearingimpairedChinesetound

11、erstandthemeaningofspeech.Aftermassexperimentanddemonstrationanefectivealgorithmisbroughtforwardwhichcanincreasethetonecontractbasedonprecisionpitchcontour.Thepresentresultsrevealthatsomeperceptualadvantagesmightbegained

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