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1、第39卷第4期聲學(xué)學(xué)報(bào)Vo1．39．No．42014年7月ACTAACUSTICAJu1．2014提高耳語(yǔ)音可懂度的非對(duì)稱(chēng)壓縮語(yǔ)音增強(qiáng)方法術(shù)周健，2鄭文明3王青云2趙力2(1安徽大學(xué)計(jì)算智能與信號(hào)處理教育部重點(diǎn)實(shí)驗(yàn)室合肥230031)(2東南大學(xué)水聲信號(hào)處理教育部重點(diǎn)實(shí)驗(yàn)室南京210096)(3東南大學(xué)兒童發(fā)展與學(xué)習(xí)科學(xué)教育部重點(diǎn)實(shí)驗(yàn)室南京210096))2012年l2月28日收到2013年5月6日定稿摘要提出兩種基于非對(duì)稱(chēng)代價(jià)函數(shù)的耳語(yǔ)音增強(qiáng)算法，將語(yǔ)音增強(qiáng)過(guò)程中的放大失真和壓縮失真區(qū)分對(duì)待。ModifiedItakura~Sa
2、ito(MIS)算法對(duì)放大失真給予更多的懲罰，而Kullback—Leibler(KL)算法則對(duì)壓縮失真給予更多的懲罰。實(shí)驗(yàn)結(jié)果表明，在低于一6dB的低信噪比情況中，經(jīng)MIS算法增強(qiáng)后的耳語(yǔ)音的可懂度相比傳統(tǒng)算法有顯著提高；而KL算法則獲得了同最小均方誤差語(yǔ)音增強(qiáng)算法近似的可懂度提高效果，證實(shí)了耳語(yǔ)音中的放大失真和壓縮失真對(duì)于耳語(yǔ)音可懂度的影響并不相同，低信噪比時(shí)較大的壓縮失真有助于提高耳語(yǔ)音可懂度，而高信噪比時(shí)的壓縮失真對(duì)耳語(yǔ)音可懂度影響較小。PACS數(shù)：43．72Anasymmetricattenuatedspeechenha
3、ncementapproachforimprovingintel1ibilityofnoisywhisperZHOUJian，。ZHENGWenming。WANGQingyun。ZHAOLi(1KeyLaboratoryofIntelligentComputingandSignalProcessingofMinistryofEducation，AnhuiUniversityHefei230031)(2KeyLaboratoryofUnderwaterAcousticSignalProcessingofMinistryofEduca
4、tion，SoutheastUniversityNanjing210096)(3KeyLaboratoryofChildDevelopmentandLearningScienceofMinistryofEducation，SoutheastUniversityNanjing210096)ReceivedDec．28，2012RevisedMalv6，2013AbstractTwoasymmetriccostfunctionforwhisperedspeechenhancementmethodsareproposed．Thecost
5、oftheamplificationdistortionandtheattenuationdistortionarediferentinbothmethods．TheModifiedItakura-SaitofMIS1distancefunctiongivesmorepenaltiestospeechamplificationdistortionwhiletheKullback—Leibler(KL)divergencefunctiongivesmorepenaltiestospeechattenuationdistortion．
6、TheexperimentalresultsshowthattheMISmethodgainslargerintelligibilityimprovementofthewhisperedspeechthantheconventionalspeechenhancementalgorithmsinmuchlowerSignaltoNoiseRatio(SNR)lessthan一6dB，andtheKLmethodhassimilarintelligibilityimprovementperformancetotheMinimumMea
7、nSquareError(MMSE)speechenhancementmethod．Theresultsconfirmthattheamplificationdistortionandtheattenuationdistortionhavediferentefectsontheintelligibilityoftheenhancedwhisper．Specifically，largerattenuationdistortioncanimprovespeechintelligibilityinlowerSNRconditionand
8、ithasalittleinfluenceonspeechintelligibilityinhighSNRcondition．冰國(guó)家自然科學(xué)基金(61301295，61231002，61273266，61003131)、安徽省自然科學(xué)基金(1308
