000002416 001__ 2416
000002416 005__ 20250424232731.0
000002416 0247_ $$2DOI$$a10.6083/M4GX48VH
000002416 037__ $$aETD
000002416 245__ $$aTemporal patterns of frequency-localized features in ASR
000002416 260__ $$bOregon Health and Sciences University
000002416 269__ $$a2003-07-01
000002416 336__ $$aDissertation
000002416 502__ $$bPh.D.
000002416 520__ $$aTemporal patterns of frequency-localized features in ASR. This work  investigates the use  of  frequency-localized temporal patterns of  the speech signal  for  developing  robust  front-end  for  Automatic  Speech  Recognition  (ASR). Various linear transforms are investigated  for  parameterization of  the frequency-localized temporal  patterns. We show  that  temporal patterns  closely  follow  the  properties  of a  first- order Markov  process,  which  results in  the PCA transforms being very close to the DCT transform.  Better  recognition performance is achieved on  using  the DCT components of temporal patterns as opposed to directly using temporal patterns  for  feature estimation. Other  linear  transforms  such  as Linear  Discriminant  Analysis  (LDA)  are  also  studied by the parameterization.  The parameterized TempoRAl  Patterns (TRAPS) are used  to estimate broad-phonetic class-posteriors independently in  each critical-band.  These class- posteriors are  combined and  used  as the features for  word  recognition.  Our work  shows that broad-phonetic features generalize better than other conventional features and yield considerable complementary information concerning short-term central features in ASR.
000002416 542__ $$fIn copyright - single owner
000002416 650__ $$aSpeech$$026226
000002416 650__ $$aPhonetics$$024006
000002416 650__ $$aMarkov Chains$$021846
000002416 650__ $$aDiscriminant Analysis$$028811
000002416 650__ $$aSpeech Perception$$026233
000002416 691__ $$aOGI School of Science and Engineering$$041365
000002416 692__ $$aOGI Department of Electrical and Computer Engineering$$041409
000002416 7001_ $$aJain, Pratibha$$uOregon Health and Science University$$041354
000002416 7201_ $$aHermansky, Hynek$$uOregon Health and Science University$$041354$$7Personal$$eAdvisor
000002416 8564_ $$91dc725b6-b434-45f6-bdcd-ae9aa46d6197$$s7293629$$uhttps://digitalcollections.ohsu.edu/record/2416/files/3154_etd.pdf$$ePublic$$28f4cc9ac3236cd8d80bdba15899a548c$$31
000002416 905__ $$a/rest/prod/g1/58/bh/48/g158bh485
000002416 909CO $$ooai:digitalcollections.ohsu.edu:2416$$pstudent-work
000002416 980__ $$aTheses and Dissertations