Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2007-03-20
2007-03-20
Abebe, Daniel (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S222000
Reexamination Certificate
active
10704068
ABSTRACT:
A method of coding an audio signal comprises receiving an audio signal x to be coded and transforming the received signal from the time to the frequency domain. A quantised audio signal {tilde over (x)} is generated from the transformed audio signal x together with a set of long-term prediction coefficients A which can be used to predict a current time frame of the received audio signal directly from one or more previous time frames of the quantised audio signal {tilde over (x)}. A predicted audio signal {circumflex over (x)} is generated using the prediction coefficients A. The predicted audio signal {circumflex over (x)} is then transformed from the time to the frequency domain and the resulting frequency domain signal compared with that of the received audio signal x to generate an error signal E(k) for each of a plurality of frequency sub-bands. The error signals E(k) are then quantised to generate a set of quantised error signals {tilde over (E)}(k) which are combined with the prediction coefficients A to generate a coded audio signal.
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Abebe Daniel
Perman & Green LLP
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