Interspeech'2005 - Eurospeech

Lisbon, Portugal
September 4-8, 2005

Revising Perceptual Linear Prediction (PLP)

Florian Hönig (1), Georg Stemmer (2), Christian Hacker (1), Fabio Brugnara (2)

(1) Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; (2) ITC-irst, Italy

Mel Frequency Cepstral Coefficients (MFCC) and Perceptual Linear Prediction (PLP) are the most popular acoustic features used in speech recognition. Often it depends on the task, which of the two methods leads to a better performance. In this work we develop acoustic features that combine the advantages of MFCC and PLP. Based on the observation that the techniques have many similarities, we revise the processing steps of PLP. In particular, the filter-bank, the equal-loudness pre-emphasis and the input for the linear prediction are improved. It is shown for a broadcast news transcription task and a corpus of children's speech that the new variant of PLP performs better than both MFCC and conventional PLP for a wide range of clean and noisy acoustic conditions.

Full Paper

Bibliographic reference.  Hönig, Florian / Stemmer, Georg / Hacker, Christian / Brugnara, Fabio (2005): "Revising Perceptual Linear Prediction (PLP)", In INTERSPEECH-2005, 2997-3000.