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- W2896532092 abstract "Human interaction with a smart speaker involves often distant automatic speech recognition (ASR). However, ASR is a rather cumbersome task at significantly high levels of noise. Most of commercial smart speakers in order to achieve high ASR accuracy they tend to reduce the playback signal once the preset keyword is detected. In an effort to dispose this function from the smart speaker, in this thesis a speech enhancement technique is considered in the front-end of the ASR system aiming at the suppression of the dominant noise component in the degraded speech signal. Having a priori knowledge on the playback signal renders adaptive filtering a well-suited speech technique. Therefore, the class of least mean squares (LMS) algorithms is studied and assessed. Among other techniques of this class the transform domain LMS (TDLMS), due to its inherent signal decorrelation properties, is shown to achieve the best performance in terms of noise suppression and improved speech intelligibility as well as word error rate. The results of this study correspond to a set of simulation incorporating real impulse responses measured in both an anechoic and a reverberant environment." @default.
- W2896532092 created "2018-10-26" @default.
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- W2896532092 date "2018-01-01" @default.
- W2896532092 modified "2023-09-27" @default.
- W2896532092 title "On speech enhancement in very low SNRs for smart speakers" @default.
- W2896532092 hasPublicationYear "2018" @default.
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