Post-filtering methods are used in mobile communications to improve the quality and intelligibility of speech. This paper introduces a frequency-adaptive post-filtering algorithm that selects from a predefined set of filters the one that reallocates the largest amount of speech energy from low to high frequencies. The proposed method and another post-filtering technique were compared to unprocessed speech in subjective listening tests in terms of intelligibility. The results indicate that the proposed method outperforms the reference method in difficult noise conditions.
Bibliographic reference. Jokinen, Emma / Takanen, Marko / Alku, Paavo (2013): "Frequency-adaptive post-filtering for intelligibility enhancement of narrowband telephone speech", In INTERSPEECH-2013, 1179-1183.