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segunda-feira, 5 de março de 2012

Priberam Machine Learning Lunch Seminars




Priberam Machine Learning Lunch Seminar
Speaker: Ramon Astudillo (INESC-ID)
Venue: IST Alameda, Sala PA2 (Edifício de Pós-Graduação)
Date: Tuesday, March 6th, 2012
Time: 13:00
Lunch will be provided

Title: Integration of Fourier Domain Speech Enhancement and Automatic
Speech Recognition through Uncertainty Propagation

Abstract:
Speech enhancement techniques aim to recover the original clean signal
underlying corrupted speech. Such techniques typically operate in the
short-time Fourier transform (STFT) domain where phenomena like
additivity of background noises, interfering speakers and echoes are
easier to model. By contrast, automatic speech recognition (ASR), and in
general most speech-related machine learning applications, operate on
feature spaces that are non-linear transformations of the STFT. The
reason for this is that such spaces provide a more compact
representation of the acoustic space, the space of all acoustic
realizations for a given task, and thus lead to simpler models. This
talk discusses the integration of STFT speech enhancement and ASR using
the concept of uncertainty propagation and decoding. This will include
conventional speech enhancement in STFT domain, its associated
uncertainty and various closed-form solutions for propagation into
domains suitable for ASR.

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