Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1998-03-02
2000-10-24
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704205, 704226, G10L 1902
Patent
active
061380938
ABSTRACT:
A post-processing method for a speech decoder which outputs a decoded speech signal in the time domain provides high frequency resolution based on a frequency spectrum having non-harmonic and noise deficiencies. This is obtained by transforming the decoded time domain signal to a frequency domain signal by using a high frequency resolution transform (FFT). Then an analysis of the energy distribution of the frequency domain signal is made throughout its frequency area (4 kHz) to find the disturbing frequency components and to prioritize such frequency components which are situated in the higher part of the frequency spectrum. Next, the suppression degree for the disturbing frequency components is found based on prioritizing. Finally the steps of controlling a post-filtering of the transform in dependence of the finding, and inverse transforming the post-filtered transform in order to obtain a post-filtered decoded speech signal in the time domain are performed.
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patent: 5550924 (1996-08-01), Helf et al.
patent: 5710862 (1998-01-01), Urbanski
Ekudden Erik
Hagen Roar
Kleijn Bastiaan
Azad Abul K.
Dorvil Richemond
Telefonaktiebolaget LM Ericsson
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