Post-processing methods can be used in mobile communications to improve the intelligibility of speech in adverse near-end noise conditions. This study proposes a phase spectrum modification method for intelligibility enhancement in mobile devices. The method first modifies the phase spectrum of speech in order to reduce the amplitude range of the signal. The amplitude level is then equalized to that of the unprocessed speech hence resulting in amplification of signal energy. The performance of the proposed method was evaluated in comparison to a known post-processing method with an objective intelligibility metric in multiple noise conditions. Results indicate that the proposed post-processing method improves speech intelligibility over the reference method.
Bibliographic reference. Jokinen, Emma / Takanen, Marko / Pulakka, Hannu / Alku, Paavo (2014): "Enhancement of speech intelligibility in near-end noise conditions with phase modification", In INTERSPEECH-2014, 1643-1647.