America Online, Inc.

American Online, Inc.

Alfred Yu

Compression of speech may be achieved through the adaptive generation of a compressed sound output. A first processing element may be used to characterize a first sound representation such that a first characterization result is produced. A comparison element may be provided to compare a first comparison input that is related to the first sound representation with a second comparison input that is related to the first characterization result. A determination may be made on whether further processing is desirable based on whether the first comparison result satisfies a first predetermined threshold criteria. Additionally, a second processing element may be included to characterize a second sound representation and to produce a second characterization result only if the first comparison result satisfies the first predetermined threshold. A compressed sound output is generated whose contents are determined based on at least the first comparison result.

Adaptively compressing sound with multiple codebooks

A sound compression system adaptively switches codebooks in and out based on a calculation carried out with the output of the codebook. The system uses three separate codebooks: adaptive vector quantization codebook, real pitch codebook, and noise codebook. The perceptually-weighted filter is generated adaptively using the predictive coefficients from the current sub-frame.

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Irvine, CA, United States of America

Alfred Yu