FASTDEREVERBERATIONFOR HANDS-FREESPEECHRECOGNITION RandyGomez
Hiroshi Saruwatari, Kiyohiro Shikano · 2008
Impulse response 11* ~~~~~~~~~~~~~0.4- Earlypart Latepart A robust dereverberation technique forreal-time hands- 002 E freespeech recognition application isproposed. Real-time 0.2 implementation ismadepossible byavoiding time-consuming-06 _ blind estimation. Instead, weusetheimpulse response byefClean fectively identifying thelate reflection components ofit. Us_2 ingthis information, together withtheconcept ofSpectral Subtraction (SS), wewereable toremovetheeffects ofthe late reflection ofthereverberant signal. After dereverberation, onlytheeffects oftheearly component isleft andusedasin* -vererant puttotherecognizer. Inthis method, multi-band SSisusedin order tocompensate fortheerrorarising fromapproximation. Wealso introduced atraining strategy tooptimize thevalues ofthemulti-band coefficients tominimize theerror.