Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-03-25
1999-05-04
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704222, 704265, G10L 500
Patent
active
058999671
ABSTRACT:
In the disclosed speech decoding device, activation of a postfilter process is halted during unvoiced sections. However, the updating process of the internal states of the postfilter continues even though the postfilter process is not activated during unvoiced sections. At changes between voiced and unvoiced sections, output signals outputted during voiced sections that have been subjected to a postfilter process and output signals outputted during unvoiced sections that have not been subjected to a postfilter process are interpolated and outputted. In one embodiment, a prefilter controller activates a prefilter state updater for unvoiced sections to update the internal state of the filter of a prefilter section based on excited signals to decrease any perception of noncontinuity in an output signal switching between activation and deactivation of the prefilter when changing between voiced and unvoiced sections.
REFERENCES:
patent: 4672670 (1987-06-01), Wang et al.
patent: 5233660 (1993-08-01), Chen
patent: 5732389 (1998-03-01), Kroon et al.
patent: 5752222 (1998-05-01), Nishiguchi et al.
Hudspeth David R.
NEC Corporation
Storm Donald L.
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