title: LANDMARK-BASED SPEECH RECOGNITION: REPORT OF THE 2004 JOHNS HOPKINS SUMMER WORKSHOP.
abstract: Three research prototype speech recognition systems are described, all of which use recently developed methods from artificial intelligence (specifically support vector machines, dynamic Bayesian networks, and maximum entropy classification) in order to implement, in the form of an automatic speech recognizer, current theories of human speech perception and phonology (specifically landmark-based speech perception, nonlinear phonology, and articulatory phonology). All three systems begin with a high-dimensional multiframe acoustic-to-distinctive feature transformation, implemented using support vector machines trained to detect and classify acoustic phonetic landmarks. Distinctive feature probabilities estimated by the support vector machines are then integrated using one of three pronunciation models: a dynamic programming algorithm that assumes canonical pronunciation of each word, a dynamic Bayesian network implementation of articulatory phonology, or a discriminative pronunciation model trained using the methods of maximum entropy classification. Log probability scores computed by these models are then combined, using log-linear combination, with other word scores available in the lattice output of a first-pass recognizer, and the resulting combination score is used to compute a second-pass speech recognition output.
authors.affiliation: University of Illinois.
authors.forename: Mark
authors.initials: M
authors.lastname: Hasegawa-Johnson
authors.forename: James
authors.initials: J
authors.lastname: Baker
authors.forename: Sarah
authors.initials: S
authors.lastname: Borys
authors.forename: Ken
authors.initials: K
authors.lastname: Chen
authors.forename: Emily
authors.initials: E
authors.lastname: Coogan
authors.forename: Steven
authors.initials: S
authors.lastname: Greenberg
authors.forename: Amit
authors.initials: A
authors.lastname: Juneja
authors.forename: Katrin
authors.initials: K
authors.lastname: Kirchhoff
authors.forename: Karen
authors.initials: K
authors.lastname: Livescu
authors.forename: Srividya
authors.initials: S
authors.lastname: Mohan
authors.forename: Jennifer
authors.initials: J
authors.lastname: Muller
authors.forename: Kemal
authors.initials: K
authors.lastname: Sonmez
authors.forename: Tianyu
authors.initials: T
authors.lastname: Wang