Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2005-03-29
2005-03-29
Chawan, Vijay B. (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S200100, C704S219000, C704S503000
Reexamination Certificate
active
06873950
ABSTRACT:
MPEG 1 Audio data compression is based on subband coding. A quantization is performed using a psychoacoustic model which is adapted to the masking behavior of the human hearing. Each subband signal is quantized in such a way that the quantization noise introduced by the coding will not exceed the masking curve for that subband. In ISO/IEC 11172-3 two independent psychoacoustic models are defined. The output from these psychoacoustic models is a set of Signal-to-Masking Ratios, SMRn, for every subband n. In order to calculate the SMRnfor the psychoacoustic model 2 according to the invention a Fast Fourier Transformation is performed with a length of L=1152 samples by calculating k subtransformations over 2Nsamples with k*2N=L and fitting together the results of the k subtransformations.
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Search Report and Priority Document.
Aust Andreas
Gao Fei
Voessing Walter
Chawan Vijay B.
Fogelson Joel M.
Kurdyla Ronald H.
Thomson Licensing S.A.
Tripoli Joseph S.
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