Patent ID: 8271272

Claim:
A scalable encoding apparatus that generates a quantized line spectrum pair (LSP) parameter of narrowband and wideband signals having scalability in a frequency axis direction from an input signal, the scalable encoding apparatus comprising: a narrowband encoding section configured as a circuit that encodes an LSP parameter of a narrowband input signal and generates a first quantized LSP parameter of the narrowband signal; a conversion section that converts a frequency band of said first quantized LSP parameter to a wideband; a wideband encoding section that encodes the LSP parameter of a wideband input signal using said first quantized LSP parameter after conversion to the wideband and generates a second quantized LSP parameter of the wideband signal; and a calculation section that calculates a set of conversion coefficients used by said conversion section based on a relationship between said first and second quantized LSP parameters generated in the past.