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1、TUTORIALSingleandMultiChannelFeatureEnhancementforDistantSpeechRecognitionJohnMcDonough(1),MatthiasWölfel(2),FriedrichFaubel(3)(1)(2)SaarlandUniversitySpokenLanguageSystems(3)TUTORIALI-ApplicationsofDSRII-CharacteristicsofHumanSpeechIII-TheAcousticEnvironme
2、ntIV-SpeechfeatureenhancementV-SpeakerTrackingVI-DigitalFilterBanksVII-BeamformingOverviewPartIIITheAcousticEnvironmentTUTORIALSoundPropagation SoundWavesSoundwavesaredisturbancesofairmolecules,whichpropagateaswavefrontsofcompressedair,followedbydecompresse
3、dair.soundsourcespeedofsoundwavefrontattenuationSoundPropagation SuperpositionSoundwavesfollowthelawofsuperposition,i.e.individualwavesfromdifferentsourcesaddupateachpointintheroom.source1source2source3SoundPropagation ReflectionSoundwavesarereflectedbyobst
4、acles,suchaswalls,columns,chairsandtables.SoundPropagation ReflectionSoundwavesarereflectedbyobstacles,suchaswalls,columns,chairsandtables.SoundPropagation ReflectionSoundwavesarereflectedbyobstacles,suchaswalls,columns,chairsandtables.SoundPropagation Refl
5、ectionSoundwavesarereflectedbyobstacles,suchaswalls,columns,chairsandtables.SoundPropagation ReflectionSoundwavesarereflectedbyobstacles,suchaswalls,columns,chairsandtables.SoundPropagation AbsorptionObstaclesdonotonlyreflectsound.Theyalsoabsorbsomeportions
6、inafrequencydependantmanner.frequency-dependantabsorptionSoundPropagation ColorationConstructiveanddestructiveinterferenceofreflectionscancausecombfilterlike“coloration”ofthesound.SoundPropagation ColorationConstructiveanddestructiveinterferenceofreflection
7、scancausecombfilterlike“coloration”ofthesound.SoundPropagation ColorationConstructiveanddestructiveinterferenceofreflectionscancausecombfilterlike“coloration”ofthesound.SoundPropagation ColorationConstructiveanddestructiveinterferenceofreflectionscancauseco
8、mbfilterlike“coloration”ofthesound.=amplificationSoundPropagation ColorationConstructiveanddestructiveinterferenceofreflectionscancausecombfilterlike“coloration”ofthesound.=attenuationConstructiveandde
