General Discussion and Future Work

Abstract

The general discussion will be structured similar to this book and the presented contributions are as follows: Implementation of a test set-up combining neurophysiological and subjective quality assessment methods for speech quality perception testing. The proof that this test set-up functions with short speech stimuli (phonemes) and a generic quality impairment, i.e. signal-correlated noise. A successful transfer of this test method to longer speech stimuli (words) with a more realistic quality impairment, i.e. reduced bit rate of a speech codec. The proof that this technique works with stimuli of standard length for speech quality assessment (sentences) and an environmental-dependent quality impairment, i.e. reverberation. Investigation of the impact of a speech compression algorithm with reduced bit rate on the cognitive state of listeners for speech stimuli of long duration (audiobooks) in constant and varying quality conditions.