Patent ID: 8898059

Claim:
A linear predicative coder (LPC) residual signal encoding apparatus of a modified discrete cosine transform (MDCT) based unified voice and audio encoding device, comprising: a signal analyzing unit to analyze a property of an input signal and to select an encoding method for an LPC filtered signal; a first encoding unit to encode the LPC residual signal based on a real filterbank according to the selection of the signal analyzing unit; a second encoding unit to encode the LPC residual signal based on a complex filterbank according to the selection of the signal analyzing unit; and a third encoding unit to encode the LPC residual signal based on an algebraic code excited linear prediction (ACELP) according to the selection of the signal analyzing unit, wherein the first encoding unit or the second encoding unit encode the LPC residual signal when the input signal is an audio signal based on the selection of the signal analyzing unit, and the third encoding unit encodes the LPC residual signal when the input signal is a voice signal.