Patent ID: 8229749

Claim:
A wideband coding apparatus, that encodes a wideband Line Spectrum Pair using a quantized narrowband Line Spectrum Pair of a speech signal, comprising: a first converter, embodied by a processor, that converts the quantized narrowband Line Spectrum Pair to a first Line Spectrum Pair comprising information about the quantized narrowband Line Spectrum Pair by up-sampling; a second converter, embodied by a processor, that comprises a conversion table stored by associating a narrowband Line Spectrum Pair with a wideband Line Spectrum Pair, specifies the wideband Line Spectrum Pair stored in the conversion table by calculation of the first Line Spectrum Pair and the narrowband Line Spectrum Pair stored in the conversion table, and outputs the specified wideband Line Spectrum Pair as a second Line Spectrum Pair; a generator, embodied by a processor, that generates a predicted wideband Line Spectrum Pair using a weighted sum of the first Line Spectrum Pair and the second Line Spectrum Pair; and an encoder, embodied by a processor, that obtains encoded data that minimizes the difference between the predicted wideband Line Spectrum Pair and the wideband Line Spectrum Pair.