Loading patent…
AssigneePanasonic Corporation
InventorHiroyuki Ehara
Estimating the term…
A scalable encoding apparatus, a scalable decoding apparatus and the like are disclosed which can achieve a band scalable LSP encoding that exhibits both a high quantization efficiency and a high performance. In these apparatuses, a narrow band-to-wide band converter receives and converts a quantized narrow band LSP to a wide band, and then outputs the quantized narrow band LSP as converted (i.e., a converted wide band LSP parameter) to an LSP-to-LPC converter. The LSP-to-LPC converter converts the quantized narrow band LSP as converted to a linear prediction coefficient and then outputs it to a pre-emphasizer. The pre-emphasizer calculates and outputs the pre-emphasized linear prediction coefficient to an LPC-to-LSP converter. The LPC-to-LSP converter converts the pre-emphasized linear prediction coefficient to a pre-emphasized quantized narrow band LSP as wide band converted, and then outputs it to a prediction quantizer.
An scalable encoding apparatus that performs predictive quantization of a wideband LSP parameter using a narrowband quantized LSP parameter, the scalable encoding apparatus comprising:
A scalable decoding apparatus that performs predictive quantization of a wideband LSP parameter using a narrowband quantized LSP parameter, the scalable encoding apparatus comprising a multistage vector quantization codebook, that comprises a plurality of codebooks, at least one of the plurality of codebooks comprising a plurality of sub-codebooks, selects a sub-codebook according to the class information from the plurality of sub-codebooks, and performs multistage vector quantization of the wideband LSP parameter using the selected sub-codebook.
Dependencies are inferred from the claim text.