Speech Signal Enhancement by Information combining
Seiten
2016
Mainz, G (Verlag)
978-3-95886-125-1 (ISBN)
Mainz, G (Verlag)
978-3-95886-125-1 (ISBN)
Mobile phones as well as tablets are omnipresent and belong to everyday life. Today
audiovisual communication takes place at different locations and in a large variety
of acoustic environments. In consequence, the intelligibility as well as the quality
of speech may significantly be degraded by ambient background noise. In order to
improve speech intelligibility and to ensure a convenient communication with high
audio quality, speech enhancement techniques are required. In this thesis all critical
components contributing to the enhancement of the up-link signal are addressed:
• signal capturing at the acoustic front-end with a new near field beamformer,
• new codebook based speech and noise estimation procedure generating and
exploiting reliability information, and
• actual noise reduction exploiting spectral dependencies of human speech.
For the acoustic front-end of the digital processing chain a novel concept for the filter
optimization of a near field beamformer is introduced. The optimization scheme
allows to closely approximate a predefined reception characteristic which can be
freely chosen according to the application. The output of the beamformer provides
a pre-enhanced signal with improved SNR for subsequent single-microphone based
speech enhancement.
audiovisual communication takes place at different locations and in a large variety
of acoustic environments. In consequence, the intelligibility as well as the quality
of speech may significantly be degraded by ambient background noise. In order to
improve speech intelligibility and to ensure a convenient communication with high
audio quality, speech enhancement techniques are required. In this thesis all critical
components contributing to the enhancement of the up-link signal are addressed:
• signal capturing at the acoustic front-end with a new near field beamformer,
• new codebook based speech and noise estimation procedure generating and
exploiting reliability information, and
• actual noise reduction exploiting spectral dependencies of human speech.
For the acoustic front-end of the digital processing chain a novel concept for the filter
optimization of a near field beamformer is introduced. The optimization scheme
allows to closely approximate a predefined reception characteristic which can be
freely chosen according to the application. The output of the beamformer provides
a pre-enhanced signal with improved SNR for subsequent single-microphone based
speech enhancement.
| Erscheinungsdatum | 21.12.2016 |
|---|---|
| Reihe/Serie | ABDN ; 44 |
| Zusatzinfo | Tabellen, Diagramme, Grafiken |
| Sprache | englisch |
| Maße | 148 x 210 mm |
| Gewicht | 268 g |
| Einbandart | Paperback |
| Themenwelt | Technik ► Elektrotechnik / Energietechnik |
| Technik ► Nachrichtentechnik | |
| Schlagworte | Error Function • Free field • Institut für Nachrichtengeräte und Datenverarbeitung • Problem Formulation • RWTH Aachen • System overview |
| ISBN-10 | 3-95886-125-3 / 3958861253 |
| ISBN-13 | 978-3-95886-125-1 / 9783958861251 |
| Zustand | Neuware |
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