Description
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 beamfor
