Patent ID: 8065141

Claim:
A signal processing apparatus comprising: a decoder for decoding an input encoded audio signal and outputting a playback audio signal; an analyzing unit for generating a linear predictive residual signal when loss of the encoded signal occurs, by analyzing the playback audio signal output before the loss occurs; a synthesizing unit comprising: a noise-like residual signal generator for generating a noise-like residual signal having a randomly varying phase from the linear predictive residual signal; a periodic residual signal generator for generating a periodic residual signal by repeating the linear predictive residual signal in accordance with a pitch period of the linear predictive residual signal; and a synthesizer for generating a synthesized audio signal by combining the noise-like residual signal and the periodic residual signal in predetermined proportions; and a switch for selecting one of the synthesized audio signal and the playback audio signal and outputting the selected audio signal as a continuous output audio signal.