Patent ID: 7899667

Claim:
A waveform interpolation encoder for reducing a computation amount of a decoder, comprising: a waveform interpolation encoding means for receiving a speech signal, calculating parameters for a waveform interpolation from the received speech signal, and quantizing the calculating parameters, and wherein the calculated parameters comprises at least a rapidly evolving waveform (REW) parameter and a slowly evolving waveform (SEW) parameter, which are each quantized after being separated out from the received speech signal; and a realignment parameter calculating means for restoring a first characteristic waveform (CW) using each of the quantized SEW parameter and the quantized REW parameter, calculating a realignment parameter that maximizes a cross-correlation among consecutive CWs for the restored CW, wherein the calculated realignment parameter is configured based on using each of the quantized SEW parameter and the quantized REW parameter, and wherein the calculated realignment parameter is configured to be used in a decoder for realigning a second CW based on the calculated parameters transmitted from the encoder.