Michael Dean Casey

US Patent:

20010044719, Nov 22, 2001

Filed:

May 21, 2001

Appl. No.:

09/861808

Inventors:

Michael Casey - Cambridge MA, US

Assignee:

Mitsubishi Electric Research Laboratories, Inc.

International Classification:

G10L015/06

US Classification:

704/245000

Abstract:

A computerized method extracts features from an acoustic signal generated from one or more sources. The acoustic signal are first windowed and filtered to produce a spectral envelope for each source. The dimensionality of the spectral envelope is then reduced to produce a set of features for the acoustic signal. The features in the set are clustered to produce a group of features for each of the sources. The features in each group include spectral features and corresponding temporal features characterizing each source. Each group of features is a quantitative descriptor that is also associated with a qualitative descriptor. Hidden Markov models are trained with sets of known features and stored in a database. The database can then be indexed by sets of unknown features to select or recognize like acoustic signals.

US Patent:

20040064306, Apr 1, 2004

Filed:

Sep 30, 2002

Appl. No.:

10/260477

Inventors:

Peter Wolf - Winchester MA, US
Michael Casey - Cambridge MA, US

International Classification:

G10L019/00

US Classification:

704/201000

Abstract:

A method selects recordings stored in a database. A spoken query is represented as a phonetic lattice and paths through the phonetic lattice are converted to a set of text queries. The database is searched to generate a playlist of recordings matching the set of text queries and samples of the recordings on the playlist are then played. A particular sample is selected as an acoustic query for searching the database to update the playlist with recording matching the acoustic query. Samples of the recordings on the updated playlist are played and a particular sample of the updated play list is selected. A particular record associated with the sample is then played.

US Patent:

63212005, Nov 20, 2001

Filed:

Jul 2, 1999

Appl. No.:

9/346854

Inventors:

Michael A. Casey - Cambridge MA

Assignee:

Mitsubish Electric Research Laboratories, INC - Cambridge MA

International Classification:

G10L 2104

US Classification:

704500

Abstract:

A method extracts features from a mixture of signals. The method filters the mixture of signals by a filterbank to produce a plurality of band-pass signals. Each band-pass signal is windowed to produce a plurality of multi-dimensional observation matrices. The multi-dimensional observation matrices are reduced in their dimensionality. Features are extracted from the reduced dimensionality matrices using independent component analysis. The features can include temporal and spectral characteristics.